1
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Koutsouflakis E, Krylov D, Bachellier N, Sostina D, Dubrovin V, Liu F, Spree L, Velkos G, Schimmel S, Wang Y, Büchner B, Westerström R, Bulbucan C, Kirkpatrick K, Muntwiler M, Dreiser J, Greber T, Avdoshenko SM, Dorn H, Popov AA. Metamagnetic transition and a loss of magnetic hysteresis caused by electron trapping in monolayers of single-molecule magnet Tb 2@C 79N. NANOSCALE 2022; 14:9877-9892. [PMID: 35781298 DOI: 10.1039/d1nr08475e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Realization of stable spin states in surface-supported magnetic molecules is crucial for their applications in molecular spintronics, memory storage or quantum information processing. In this work, we studied the surface magnetism of dimetallo-azafullerene Tb2@C79N, showing a broad magnetic hysteresis in a bulk form. Surprisingly, monolayers of Tb2@C79N exhibited a completely different behavior, with the prevalence of a ground state with antiferromagnetic coupling at low magnetic field and a metamagnetic transition in the magnetic field of 2.5-4 T. Monolayers of Tb2@C79N were deposited onto Cu(111) and Au(111) by evaporation in ultra-high vacuum conditions, and their topography and electronic structure were characterized by scanning tunneling microscopy and spectroscopy (STM/STS). X-ray photoelectron spectroscopy (XPS), in combination with DFT studies, revealed that the nitrogen atom of the azafullerene cage tends to avoid metallic surfaces. Magnetic properties of the (sub)monolayers were then studied by X-ray magnetic circular dichroism (XMCD) at the Tb-M4,5 absorption edge. While in bulk powder samples Tb2@C79N behaves as a single-molecule magnet with ferromagnetically coupled magnetic moments and blocking of magnetization at 28 K, its monolayers exhibited a different ground state with antiferromagnetic coupling of Tb magnetic moments. To understand if this unexpected behavior is caused by a strong hybridization of fullerenes with metallic substrates, XMCD measurements were also performed for Tb2@C79N adsorbed on h-BN|Rh(111) and MgO|Ag(100). The co-existence of two forms of Tb2@C79N was found on these substrates as well, but magnetization curves showed narrow magnetic hysteresis detectable up to 25 K. The non-magnetic state of Tb2@C79N in monolayers is assigned to anionic Tb2@C79N- species with doubly-occupied Tb-Tb bonding orbital and antiferromagnetic coupling of the Tb moments. A charge transfer from the substrate or trapping of secondary electrons are discussed as a plausible origin of these species.
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Affiliation(s)
- Emmanouil Koutsouflakis
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany.
| | - Denis Krylov
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany.
| | - Nicolas Bachellier
- Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Daria Sostina
- Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Vasilii Dubrovin
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany.
| | - Fupin Liu
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany.
| | - Lukas Spree
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany.
| | - Georgios Velkos
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany.
| | - Sebastian Schimmel
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany.
| | - Yaofeng Wang
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany.
| | - Bernd Büchner
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany.
| | - Rasmus Westerström
- The Division of Synchrotron Radiation Research, Lund University, SE-22100 Lund, Sweden
- NanoLund, Lund University, Box 118, 22100 Lund, Sweden
| | - Claudiu Bulbucan
- The Division of Synchrotron Radiation Research, Lund University, SE-22100 Lund, Sweden
- NanoLund, Lund University, Box 118, 22100 Lund, Sweden
| | - Kyle Kirkpatrick
- Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
| | - Matthias Muntwiler
- Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Jan Dreiser
- Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Thomas Greber
- Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
- Physik-Institut der Universität Zürich, Winterthurerstr. 190, CH-8057 Zürich, Switzerland
| | - Stas M Avdoshenko
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany.
| | - Harry Dorn
- Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
| | - Alexey A Popov
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany.
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2
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A tetrairon(III) single-molecule magnet and its solvatomorphs: synthesis, crystal structures and vapor-phase processing. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2021.120698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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3
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Martynov AG, Horii Y, Katoh K, Bian Y, Jiang J, Yamashita M, Gorbunova YG. Rare-earth based tetrapyrrolic sandwiches: chemistry, materials and applications. Chem Soc Rev 2022; 51:9262-9339. [DOI: 10.1039/d2cs00559j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
This review summarises advances in chemistry of tetrapyrrole sandwiches with rare earth elements and highlights the current state of their use in single-molecule magnetism, organic field-effect transistors, conducting materials and nonlinear optics.
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Affiliation(s)
- Alexander G. Martynov
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071, Leninskiy pr., 31, bldg.4, Moscow, Russia
| | - Yoji Horii
- Department of Chemistry, Faculty of Science, Nara Women's University, Nara 630-8506, Japan
| | - Keiichi Katoh
- Department of Chemistry, Graduate School of Science, Josai University, 1-1 Keyakidai, Sakado, Saitama 350-0295, Japan
| | - Yongzhong Bian
- Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, Department of Chemistry, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing, China
- Daxing Research Institute, and Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing, China
| | - Jianzhuang Jiang
- Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, Department of Chemistry, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing, China
- Daxing Research Institute, and Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing, China
| | - Masahiro Yamashita
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-Ku, Sendai 980-8578, Japan
| | - Yulia G. Gorbunova
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071, Leninskiy pr., 31, bldg.4, Moscow, Russia
- N.S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 119991, Leninskiy pr., 31, Moscow, Russia
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4
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Paschke F, Birk T, Enenkel V, Liu F, Romankov V, Dreiser J, Popov AA, Fonin M. Exceptionally High Blocking Temperature of 17 K in a Surface-Supported Molecular Magnet. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2102844. [PMID: 34396601 DOI: 10.1002/adma.202102844] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 06/09/2021] [Indexed: 06/13/2023]
Abstract
Single-molecule magnets (SMMs) are among the most promising building blocks for future magnetic data storage or quantum computing applications, owing to magnetic bistability and long magnetic relaxation times. The practical device integration requires realization of 2D surface assemblies of SMMs, where each magnetic unit shows magnetic relaxation being sufficiently slow at application-relevant temperatures. Using X-ray absorption spectroscopy and X-ray magnetic circular dichroism, it is shown that sub-monolayers of Dy2 @C80 (CH2 Ph) dimetallofullerenes prepared on graphene by electrospray deposition exhibit magnetic behavior fully comparable to that of the bulk. Magnetic hysteresis and relaxation time measurements show that the magnetic moment remains stable for 100 s at 17 K, marking the blocking temperature TB(100) , being not only in excellent agreement with that of the bulk sample but also representing by far the highest one detected for a surface-supported single-molecule magnet. The reported findings give a boost to the efforts to stabilize and address the spin degree of freedom in molecular magnets aiming at the realization of SMM-based spintronic units.
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Affiliation(s)
- Fabian Paschke
- Department of Physics, University of Konstanz, 78457, Konstanz, Germany
| | - Tobias Birk
- Department of Physics, University of Konstanz, 78457, Konstanz, Germany
| | - Vivien Enenkel
- Department of Physics, University of Konstanz, 78457, Konstanz, Germany
| | - Fupin Liu
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), 01069, Dresden, Germany
| | - Vladyslav Romankov
- Swiss Light Source, Paul Scherrer Institute, Villigen, 5232, Switzerland
| | - Jan Dreiser
- Swiss Light Source, Paul Scherrer Institute, Villigen, 5232, Switzerland
| | - Alexey A Popov
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), 01069, Dresden, Germany
| | - Mikhail Fonin
- Department of Physics, University of Konstanz, 78457, Konstanz, Germany
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5
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Krylov DS, Schimmel S, Dubrovin V, Liu F, Nguyen TTN, Spree L, Chen C, Velkos G, Bulbucan C, Westerström R, Studniarek M, Dreiser J, Hess C, Büchner B, Avdoshenko SM, Popov AA. Substrate‐Independent Magnetic Bistability in Monolayers of the Single‐Molecule Magnet Dy
2
ScN@C
80
on Metals and Insulators. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201913955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Denis S. Krylov
- Leibniz Institute for Solid State and Materials Research Helmholtzstraße 20 01069 Dresden Germany
- Center for Quantum Nanoscience Institute for Basic Science (IBS) Seoul Republic of Korea
| | - Sebastian Schimmel
- Leibniz Institute for Solid State and Materials Research Helmholtzstraße 20 01069 Dresden Germany
| | - Vasilii Dubrovin
- Leibniz Institute for Solid State and Materials Research Helmholtzstraße 20 01069 Dresden Germany
| | - Fupin Liu
- Leibniz Institute for Solid State and Materials Research Helmholtzstraße 20 01069 Dresden Germany
| | - T. T. Nhung Nguyen
- Leibniz Institute for Solid State and Materials Research Helmholtzstraße 20 01069 Dresden Germany
| | - Lukas Spree
- Leibniz Institute for Solid State and Materials Research Helmholtzstraße 20 01069 Dresden Germany
| | - Chia‐Hsiang Chen
- Leibniz Institute for Solid State and Materials Research Helmholtzstraße 20 01069 Dresden Germany
- Department of Medicinal and Applied Chemistry Kaohsiung Medical University Kaohsiung 807 Taiwan
| | - Georgios Velkos
- Leibniz Institute for Solid State and Materials Research Helmholtzstraße 20 01069 Dresden Germany
| | - Claudiu Bulbucan
- The division of synchrotron radiation research Lund University 22100 Lund Sweden
| | - Rasmus Westerström
- The division of synchrotron radiation research Lund University 22100 Lund Sweden
| | - Michał Studniarek
- Swiss Light Source Paul Scherrer Institute 5232 Villigen PSI Switzerland
| | - Jan Dreiser
- Swiss Light Source Paul Scherrer Institute 5232 Villigen PSI Switzerland
| | - Christian Hess
- Leibniz Institute for Solid State and Materials Research Helmholtzstraße 20 01069 Dresden Germany
| | - Bernd Büchner
- Leibniz Institute for Solid State and Materials Research Helmholtzstraße 20 01069 Dresden Germany
| | - Stanislav M. Avdoshenko
- Leibniz Institute for Solid State and Materials Research Helmholtzstraße 20 01069 Dresden Germany
| | - Alexey A. Popov
- Leibniz Institute for Solid State and Materials Research Helmholtzstraße 20 01069 Dresden Germany
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6
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Krylov DS, Schimmel S, Dubrovin V, Liu F, Nguyen TTN, Spree L, Chen C, Velkos G, Bulbucan C, Westerström R, Studniarek M, Dreiser J, Hess C, Büchner B, Avdoshenko SM, Popov AA. Substrate-Independent Magnetic Bistability in Monolayers of the Single-Molecule Magnet Dy 2 ScN@C 80 on Metals and Insulators. Angew Chem Int Ed Engl 2020; 59:5756-5764. [PMID: 31860759 PMCID: PMC7155138 DOI: 10.1002/anie.201913955] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 12/11/2019] [Indexed: 01/08/2023]
Abstract
Magnetic hysteresis is demonstrated for monolayers of the single-molecule magnet (SMM) Dy2 ScN@C80 deposited on Au(111), Ag(100), and MgO|Ag(100) surfaces by vacuum sublimation. The topography and electronic structure of Dy2 ScN@C80 adsorbed on Au(111) were studied by STM. X-ray magnetic CD studies show that the Dy2 ScN@C80 monolayers exhibit similarly broad magnetic hysteresis independent on the substrate used, but the orientation of the Dy2 ScN cluster depends strongly on the surface. DFT calculations show that the extent of the electronic interaction of the fullerene molecules with the surface is increasing dramatically from MgO to Au(111) and Ag(100). However, the charge redistribution at the fullerene-surface interface is fully absorbed by the carbon cage, leaving the state of the endohedral cluster intact. This Faraday cage effect of the fullerene preserves the magnetic bistability of fullerene-SMMs on conducting substrates and facilitates their application in molecular spintronics.
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Affiliation(s)
- Denis S. Krylov
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 2001069DresdenGermany
- Center for Quantum NanoscienceInstitute for Basic Science (IBS)SeoulRepublic of Korea
| | - Sebastian Schimmel
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 2001069DresdenGermany
| | - Vasilii Dubrovin
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 2001069DresdenGermany
| | - Fupin Liu
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 2001069DresdenGermany
| | - T. T. Nhung Nguyen
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 2001069DresdenGermany
| | - Lukas Spree
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 2001069DresdenGermany
| | - Chia‐Hsiang Chen
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 2001069DresdenGermany
- Department of Medicinal and Applied ChemistryKaohsiung Medical UniversityKaohsiung807Taiwan
| | - Georgios Velkos
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 2001069DresdenGermany
| | - Claudiu Bulbucan
- The division of synchrotron radiation researchLund University22100LundSweden
| | - Rasmus Westerström
- The division of synchrotron radiation researchLund University22100LundSweden
| | - Michał Studniarek
- Swiss Light SourcePaul Scherrer Institute5232Villigen PSISwitzerland
| | - Jan Dreiser
- Swiss Light SourcePaul Scherrer Institute5232Villigen PSISwitzerland
| | - Christian Hess
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 2001069DresdenGermany
| | - Bernd Büchner
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 2001069DresdenGermany
| | - Stanislav M. Avdoshenko
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 2001069DresdenGermany
| | - Alexey A. Popov
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 2001069DresdenGermany
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7
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Studniarek M, Wäckerlin C, Singha A, Baltic R, Diller K, Donati F, Rusponi S, Brune H, Lan Y, Klyatskaya S, Ruben M, Seitsonen AP, Dreiser J. Understanding the Superior Stability of Single-Molecule Magnets on an Oxide Film. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2019; 6:1901736. [PMID: 31763154 PMCID: PMC6864999 DOI: 10.1002/advs.201901736] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 09/05/2019] [Indexed: 05/12/2023]
Abstract
The stability of magnetic information stored in surface adsorbed single-molecule magnets is of critical interest for applications in nanoscale data storage or quantum computing. The present study combines X-ray magnetic circular dichroism, density functional theory and magnetization dynamics calculations to gain deep insight into the substrate dependent relevant magnetization relaxation mechanisms. X-ray magnetic circular dichroism reveals the opening of a butterfly-shaped magnetic hysteresis of DyPc2 molecules on magnesium oxide and a closed loop on the bare silver substrate, while density functional theory shows that the molecules are only weakly adsorbed in both cases of magnesium oxide and silver. The enhanced magnetic stability of DyPc2 on the oxide film, in conjunction with previous experiments on the TbPc2 analogue, points to a general validity of the magnesium oxide induced stabilization effect. Magnetization dynamics calculations reveal that the enhanced magnetic stability of DyPc2 and TbPc2 on the oxide film is due to the suppression of two-phonon Raman relaxation processes. The results suggest that substrates with low phonon density of states are beneficial for the design of spintronics devices based on single-molecule magnets.
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Affiliation(s)
- Michał Studniarek
- Swiss Light SourcePaul Scherrer Institut (PSI)CH‐5232VilligenSwitzerland
| | - Christian Wäckerlin
- Institute of Physics (IPHYS)École Polytechnique Fédérale de Lausanne (EPFL)Station 3CH‐1015LausanneSwitzerland
- Institute of PhysicsThe Czech Academy of SciencesCukrovarnická 10CZ‐162 00Prague 6Czech Republic
| | - Aparajita Singha
- Institute of Physics (IPHYS)École Polytechnique Fédérale de Lausanne (EPFL)Station 3CH‐1015LausanneSwitzerland
- Center for Quantum NanoscienceInstitute for Basic Science (IBS)03760SeoulRepublic of Korea
- Department of PhysicsEwha Womans University03760SeoulRepublic of Korea
| | - Romana Baltic
- Institute of Physics (IPHYS)École Polytechnique Fédérale de Lausanne (EPFL)Station 3CH‐1015LausanneSwitzerland
| | - Katharina Diller
- Institute of Physics (IPHYS)École Polytechnique Fédérale de Lausanne (EPFL)Station 3CH‐1015LausanneSwitzerland
| | - Fabio Donati
- Institute of Physics (IPHYS)École Polytechnique Fédérale de Lausanne (EPFL)Station 3CH‐1015LausanneSwitzerland
- Center for Quantum NanoscienceInstitute for Basic Science (IBS)03760SeoulRepublic of Korea
- Department of PhysicsEwha Womans University03760SeoulRepublic of Korea
| | - Stefano Rusponi
- Institute of Physics (IPHYS)École Polytechnique Fédérale de Lausanne (EPFL)Station 3CH‐1015LausanneSwitzerland
| | - Harald Brune
- Institute of Physics (IPHYS)École Polytechnique Fédérale de Lausanne (EPFL)Station 3CH‐1015LausanneSwitzerland
| | - Yanhua Lan
- Institute of Nanotechnology (INT)Karlsruhe Institute of Technology (KIT)Hermann‐von‐Helmholtz‐Platz 1D‐76344Eggenstein‐LeopoldshafenGermany
| | - Svetlana Klyatskaya
- Institute of Nanotechnology (INT)Karlsruhe Institute of Technology (KIT)Hermann‐von‐Helmholtz‐Platz 1D‐76344Eggenstein‐LeopoldshafenGermany
| | - Mario Ruben
- Institute of Nanotechnology (INT)Karlsruhe Institute of Technology (KIT)Hermann‐von‐Helmholtz‐Platz 1D‐76344Eggenstein‐LeopoldshafenGermany
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS)Centre National de la Recherche Scientifique (CNRS)Université de Strasbourg23 rue du Loess, BP 43F‐67034Strasbourg Cedex 2France
| | - Ari Paavo Seitsonen
- Département de ChimieÉcole Normale SupérieureF‐75005ParisFrance
- Centre National de la Recherche Scientifique (CNRS)Paris Sciences et LettresSorbonne UniversitéF‐75005ParisFrance
| | - Jan Dreiser
- Swiss Light SourcePaul Scherrer Institut (PSI)CH‐5232VilligenSwitzerland
- Institute of Physics (IPHYS)École Polytechnique Fédérale de Lausanne (EPFL)Station 3CH‐1015LausanneSwitzerland
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8
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Cañon-Mancisidor W, Miralles SG, Baldoví JJ, Espallargas GM, Gaita-Ariño A, Coronado E. Sublimable Single Ion Magnets Based on Lanthanoid Quinolinate Complexes: The Role of Intermolecular Interactions on Their Thermal Stability. Inorg Chem 2018; 57:14170-14177. [PMID: 30378423 DOI: 10.1021/acs.inorgchem.8b02080] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report the design, preparation, and characterization of two families of thermally robust coordination complexes based on lanthanoid quinolinate compounds: [Ln(5,7-Br2q)4]- and [Ln(5,7-ClIq)4]-, where q = 8-hydroquinolinate anion and Ln = DyIII, TbIII, ErIII, and HoIII. The sodium salt of [Dy(5,7-Br2q)4]- decomposes upon sublimation, whereas the sodium salt of [Dy(5,7-ClIq)4]-, which displays subtly different crystalline interactions, is sublimable under gentle conditions. The resulting film presents low roughness with high coverage, and the molecular integrity of the coordination complex is verified through AFM, MALDI-TOF, FT-IR, and microanalysis. Crucially, the single-molecule magnet behavior exhibited by [Dy(5,7-ClIq)4]- in bulk remains detectable by ac magnetometry in the sublimated film.
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Affiliation(s)
- Walter Cañon-Mancisidor
- Instituto de Ciencia Molecular (ICMol) , Universitat de València , c/Catedrático José Beltrán, 2 , E-46980 Paterna , Spain.,Facultad de Química y Biología, Depto. de Química de los Materiales , Universidad de Santiago de Chile, USACH , Av. Lib Bernardo O'Higgins 3363 , Estación Central , CP-9170022 , Chile.,Center for the Development of Nanoscience and Nanotechnology, CEDENNA , Av. Lib Bernardo O'Higgins 3363 , Estación Central , CP-9170022 , Chile
| | - Sara G Miralles
- Instituto de Ciencia Molecular (ICMol) , Universitat de València , c/Catedrático José Beltrán, 2 , E-46980 Paterna , Spain
| | - José J Baldoví
- Max Planck Institute for the Structure and Dynamics of Matter , Luruper Chaussee 149 , D-22761 Hamburg , Germany
| | - Guillermo Mínguez Espallargas
- Instituto de Ciencia Molecular (ICMol) , Universitat de València , c/Catedrático José Beltrán, 2 , E-46980 Paterna , Spain
| | - Alejandro Gaita-Ariño
- Instituto de Ciencia Molecular (ICMol) , Universitat de València , c/Catedrático José Beltrán, 2 , E-46980 Paterna , Spain
| | - Eugenio Coronado
- Instituto de Ciencia Molecular (ICMol) , Universitat de València , c/Catedrático José Beltrán, 2 , E-46980 Paterna , Spain
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9
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Bunting PC, Atanasov M, Damgaard-Møller E, Perfetti M, Crassee I, Orlita M, Overgaard J, van Slageren J, Neese F, Long JR. A linear cobalt(II) complex with maximal orbital angular momentum from a non-Aufbau ground state. Science 2018; 362:science.aat7319. [DOI: 10.1126/science.aat7319] [Citation(s) in RCA: 190] [Impact Index Per Article: 31.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 08/02/2018] [Accepted: 11/01/2018] [Indexed: 01/18/2023]
Abstract
Orbital angular momentum is a prerequisite for magnetic anisotropy, although in transition metal complexes it is typically quenched by the ligand field. By reducing the basicity of the carbon donor atoms in a pair of alkyl ligands, we synthesized a cobalt(II) dialkyl complex, Co(C(SiMe2ONaph)3)2 (where Me is methyl and Naph is a naphthyl group), wherein the ligand field is sufficiently weak that interelectron repulsion and spin-orbit coupling play a dominant role in determining the electronic ground state. Assignment of a non-Aufbau (dx2–y2, dxy)3(dxz, dyz)3(dz2)1 electron configuration is supported by dc magnetic susceptibility data, experimental charge density maps, and ab initio calculations. Variable-field far-infrared spectroscopy and ac magnetic susceptibility measurements further reveal slow magnetic relaxation via a 450–wave number magnetic excited state.
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Affiliation(s)
- Philip C. Bunting
- Department of Chemistry, University of California, Berkeley, CA 94720, USA
| | - Mihail Atanasov
- Max-Planck-Insitut für Kohlenforschung, Mülheim an der Ruhr D-45470, Germany
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Academy Georgi Bontchev, Sofia 1113, Bulgaria
| | - Emil Damgaard-Møller
- Department of Chemistry and Centre for Materials Crystallography, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Mauro Perfetti
- Institut für Physikalische Chemie and Center for Integrated Quantum Science and Technology (IQST), Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Iris Crassee
- Univ. Grenoble Alpes, Laboratoire National des Champs Magnétiques Intenses, CNRS-UGA-UPS-INSA-EMFL, 25 rue des Martyrs, 38042 Grenoble, France
| | - Milan Orlita
- Univ. Grenoble Alpes, Laboratoire National des Champs Magnétiques Intenses, CNRS-UGA-UPS-INSA-EMFL, 25 rue des Martyrs, 38042 Grenoble, France
- Institute of Physics, Charles University, Ke Karlovu 5, 12116 Praha 2, Czech Republic
| | - Jacob Overgaard
- Department of Chemistry and Centre for Materials Crystallography, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Joris van Slageren
- Institut für Physikalische Chemie and Center for Integrated Quantum Science and Technology (IQST), Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Frank Neese
- Max-Planck-Insitut für Kohlenforschung, Mülheim an der Ruhr D-45470, Germany
| | - Jeffrey R. Long
- Department of Chemistry, University of California, Berkeley, CA 94720, USA
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
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10
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Kappler JP, Otero E, Li W, Joly L, Schmerber G, Muller B, Scheurer F, Leduc F, Gobaut B, Poggini L, Serrano G, Choueikani F, Lhotel E, Cornia A, Sessoli R, Mannini M, Arrio MA, Sainctavit P, Ohresser P. Ultralow-temperature device dedicated to soft X-ray magnetic circular dichroism experiments. JOURNAL OF SYNCHROTRON RADIATION 2018; 25:1727-1735. [PMID: 30407183 PMCID: PMC6225739 DOI: 10.1107/s1600577518012717] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Accepted: 09/07/2018] [Indexed: 06/08/2023]
Abstract
A new ultralow-temperature setup dedicated to soft X-ray absorption spectroscopy and X-ray magnetic circular dichroism (XMCD) experiments is described. Two experiments, performed on the DEIMOS beamline (SOLEIL synchrotron), demonstrate the outstanding performance of this new platform in terms of the lowest achievable temperature under X-ray irradiation (T = 220 mK), the precision in controlling the temperature during measurements as well as the speed of the cooling-down and warming-up procedures. Moreover, owing to the new design of the setup, the eddy-current power is strongly reduced, allowing fast scanning of the magnetic field in XMCD experiments; these performances lead to a powerful device for X-ray spectroscopies on synchrotron-radiation beamlines facilities.
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Affiliation(s)
- J.-P. Kappler
- Synchrotron SOLEIL, L’Orme des Merisiers, BP 48, 91192 Gif-sur-Yvette, France
| | - E. Otero
- Synchrotron SOLEIL, L’Orme des Merisiers, BP 48, 91192 Gif-sur-Yvette, France
| | - W. Li
- Synchrotron SOLEIL, L’Orme des Merisiers, BP 48, 91192 Gif-sur-Yvette, France
| | - L. Joly
- Synchrotron SOLEIL, L’Orme des Merisiers, BP 48, 91192 Gif-sur-Yvette, France
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, 23 rue du Loess, 67034 Strasbourg, France
| | - G. Schmerber
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, 23 rue du Loess, 67034 Strasbourg, France
| | - B. Muller
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, 23 rue du Loess, 67034 Strasbourg, France
| | - F. Scheurer
- Synchrotron SOLEIL, L’Orme des Merisiers, BP 48, 91192 Gif-sur-Yvette, France
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, 23 rue du Loess, 67034 Strasbourg, France
| | - F. Leduc
- Synchrotron SOLEIL, L’Orme des Merisiers, BP 48, 91192 Gif-sur-Yvette, France
| | - B. Gobaut
- Synchrotron SOLEIL, L’Orme des Merisiers, BP 48, 91192 Gif-sur-Yvette, France
| | - L. Poggini
- Department of Chemistry ‘U. Schiff’ and INSTM RU, University of Firenze, Via della Lastruccia n. 3, 50019 Sesto Fiorentino (FI), Italy
| | - G. Serrano
- Department of Chemistry ‘U. Schiff’ and INSTM RU, University of Firenze, Via della Lastruccia n. 3, 50019 Sesto Fiorentino (FI), Italy
| | - F. Choueikani
- Synchrotron SOLEIL, L’Orme des Merisiers, BP 48, 91192 Gif-sur-Yvette, France
| | - E. Lhotel
- Institut Néel, 25 rue des Martyrs, 38042 Grenoble, France
| | - A. Cornia
- Department of Chemical and Geological Sciences and INSTM RU, University of Modena and Reggio Emilia, via G. Campi 103, I-41125 Modena, Italy
| | - R. Sessoli
- Department of Chemistry ‘U. Schiff’ and INSTM RU, University of Firenze, Via della Lastruccia n. 3, 50019 Sesto Fiorentino (FI), Italy
| | - M. Mannini
- Department of Chemistry ‘U. Schiff’ and INSTM RU, University of Firenze, Via della Lastruccia n. 3, 50019 Sesto Fiorentino (FI), Italy
| | - M.-A. Arrio
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, CNRS, Sorbonne Université, IRD, MNHN, UMR 7590, 4 place Jussieu, 75252 Paris Cedex 05, France
| | - Ph. Sainctavit
- Synchrotron SOLEIL, L’Orme des Merisiers, BP 48, 91192 Gif-sur-Yvette, France
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, CNRS, Sorbonne Université, IRD, MNHN, UMR 7590, 4 place Jussieu, 75252 Paris Cedex 05, France
| | - P. Ohresser
- Synchrotron SOLEIL, L’Orme des Merisiers, BP 48, 91192 Gif-sur-Yvette, France
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11
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Serrano G, Velez-Fort E, Cimatti I, Cortigiani B, Malavolti L, Betto D, Ouerghi A, Brookes NB, Mannini M, Sessoli R. Magnetic bistability of a TbPc 2 submonolayer on a graphene/SiC(0001) conductive electrode. NANOSCALE 2018; 10:2715-2720. [PMID: 29372744 DOI: 10.1039/c7nr08372f] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The alteration of the properties of single-molecule magnets (SMMs) due to the interaction with metallic electrodes is detrimental to their employment in spintronic devices. Conversely, herein we show that the terbium(iii) bis-phthalocyaninato complex, TbPc2, maintains its SMM behavior up to 9 K on a graphene/SiC(0001) substrate, making this alternative conductive layer highly promising for molecular spintronic applications.
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Affiliation(s)
- G Serrano
- Department of Chemistry and INSTM RU, University of Florence, Via della Lastruccia 3, 50019, Sesto Fiorentino (FI), Italy.
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12
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Moreno Pineda E, Komeda T, Katoh K, Yamashita M, Ruben M. Surface confinement of TbPc 2-SMMs: structural, electronic and magnetic properties. Dalton Trans 2018; 45:18417-18433. [PMID: 27824366 DOI: 10.1039/c6dt03298b] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Since 2003, terbium(iii) bis-phthalocyaninato complexes have been recognised as acting as single molecule magnets (SMMs), propitiating multiple studies with the aim of better understanding the single metal-ion based magnetism with unusually high blocking temperatures. In the quest for novel applications, it became clear that if spintronic devices were made from SMM molecules, their confinement in the proximity of surfaces or electrodes would become difficult to circumvent. In this perspective article, we highlight the influence of the presence of different substrates on the magnetic performance of TbPc2-SMMs, in principle caused by, among other effects, electronic hybridization, dipole-dipole coupling and changing quantum tunnelling (QT) rates on the surface. We show that the improved comprehension of how SMMs interact and communicate with the environment finally leads to magnetic remanence and lower tunnelling rates, paving the way to novel classes of spintronic devices.
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Affiliation(s)
- Eufemio Moreno Pineda
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany.
| | - Tadahiro Komeda
- Institute of Multidisciplinary Research for Advanced Materials (IMRAM, Tagen), Tohoku University, Japan
| | - Keiichi Katoh
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki-Aza-Aoba, Aoba-Ku, Sendai 980-8578, Japan.
| | - Masahiro Yamashita
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki-Aza-Aoba, Aoba-Ku, Sendai 980-8578, Japan. and WPI Research Center, Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Mario Ruben
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany. and WPI Research Center, Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan and Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), CNRS-Université de Strasbourg, 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France
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13
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Miralles SG, Bedoya-Pinto A, Baldoví JJ, Cañon-Mancisidor W, Prado Y, Prima-Garcia H, Gaita-Ariño A, Mínguez Espallargas G, Hueso LE, Coronado E. Sublimable chloroquinolinate lanthanoid single-ion magnets deposited on ferromagnetic electrodes. Chem Sci 2017; 9:199-208. [PMID: 29629088 PMCID: PMC5869315 DOI: 10.1039/c7sc03463f] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Accepted: 10/17/2017] [Indexed: 01/17/2023] Open
Abstract
A new family of chloroquinolinate lanthanoid complexes of the formula A+[Ln(5,7Cl2q)4]-, with Ln = Y3+, Tb3+ and Dy3+ and A+ = Na+, NEt4+ and K0.5(NEt4)0.5+, is studied, both in bulk and as thin films. Several members of the family are found to present single-molecule magnetic behavior in bulk. Interestingly, the sodium salts can be sublimed under high vacuum conditions retaining their molecular structures and magnetic properties. These thermally stable compounds have been deposited on different substrates (Al2O3, Au and NiFe). The magnetic properties of these molecular films show the appearance of cusps in the zero-field cooled curves when they are deposited on permalloy (NiFe). This indicates a magnetic blocking caused by the interaction between the single-ion magnet and the ferromagnet. X-ray absorption spectroscopy confirms the formation of hybrid states at the molecule/metal interface.
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Affiliation(s)
- Sara G Miralles
- Instituto de Ciencia Molecular (ICMol) , Universidad de Valencia , Catedrático José Beltrán 2, 46980 Paterna , Valencia , Spain .
| | - Amilcar Bedoya-Pinto
- CIC nanoGUNE , Tolosa Hiribidea 76 , 20018 Donostia-San Sebastián , Spain . .,Max-Planck Institute of Microstructure Physics , Weinberg 2 , 06120 Halle , Germany
| | - José J Baldoví
- Instituto de Ciencia Molecular (ICMol) , Universidad de Valencia , Catedrático José Beltrán 2, 46980 Paterna , Valencia , Spain . .,Max Planck Institute for the Structure and Dynamics of Matter , Luruper Chaussee 149 , D-22761 Hamburg , Germany
| | - Walter Cañon-Mancisidor
- Instituto de Ciencia Molecular (ICMol) , Universidad de Valencia , Catedrático José Beltrán 2, 46980 Paterna , Valencia , Spain . .,Facultad de Química y Biologia , Depto. de Química de los Materiales , Universidad de Santiago de Chile , USACH , Chile
| | - Yoann Prado
- Instituto de Ciencia Molecular (ICMol) , Universidad de Valencia , Catedrático José Beltrán 2, 46980 Paterna , Valencia , Spain .
| | - Helena Prima-Garcia
- Instituto de Ciencia Molecular (ICMol) , Universidad de Valencia , Catedrático José Beltrán 2, 46980 Paterna , Valencia , Spain .
| | - Alejandro Gaita-Ariño
- Instituto de Ciencia Molecular (ICMol) , Universidad de Valencia , Catedrático José Beltrán 2, 46980 Paterna , Valencia , Spain .
| | - Guillermo Mínguez Espallargas
- Instituto de Ciencia Molecular (ICMol) , Universidad de Valencia , Catedrático José Beltrán 2, 46980 Paterna , Valencia , Spain .
| | - Luis E Hueso
- CIC nanoGUNE , Tolosa Hiribidea 76 , 20018 Donostia-San Sebastián , Spain .
| | - Eugenio Coronado
- Instituto de Ciencia Molecular (ICMol) , Universidad de Valencia , Catedrático José Beltrán 2, 46980 Paterna , Valencia , Spain .
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14
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Lu G, He C, Wang K, Sun J, Qi D, Gong L, Wang C, Ou Z, Yan S, Zeng S, Zhu W. Dysprosium Heteroleptic Corrole-Phthalocyanine Triple-Decker Complexes: Synthesis, Crystal Structure, and Electrochemical and Magnetic Properties. Inorg Chem 2017; 56:11503-11512. [DOI: 10.1021/acs.inorgchem.7b01060] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Guifen Lu
- School of Chemistry
and Chemical Engineering, Jiangsu University, Zhenjiang 212013, People’s Republic of China
| | - Cheng He
- School of Chemistry
and Chemical Engineering, Jiangsu University, Zhenjiang 212013, People’s Republic of China
| | - Kang Wang
- Department
of Chemistry, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
| | - Junshan Sun
- College of Chemistry and Chemical Engineering, TaiShan University, Taian 271000, People’s Republic of China
| | - Dongdong Qi
- Department
of Chemistry, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
| | - Lei Gong
- Department
of Chemistry, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
| | - Chiming Wang
- Department
of Chemistry, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
| | - Zhongping Ou
- School of Chemistry
and Chemical Engineering, Jiangsu University, Zhenjiang 212013, People’s Republic of China
| | - Sen Yan
- School of Chemistry
and Chemical Engineering, Jiangsu University, Zhenjiang 212013, People’s Republic of China
| | - Suyuan Zeng
- School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, People’s Republic of China
| | - Weihua Zhu
- School of Chemistry
and Chemical Engineering, Jiangsu University, Zhenjiang 212013, People’s Republic of China
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15
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Serri M, Mannini M, Poggini L, Vélez-Fort E, Cortigiani B, Sainctavit P, Rovai D, Caneschi A, Sessoli R. Low-Temperature Magnetic Force Microscopy on Single Molecule Magnet-Based Microarrays. NANO LETTERS 2017; 17:1899-1905. [PMID: 28165249 DOI: 10.1021/acs.nanolett.6b05208] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The magnetic properties of some single molecule magnets (SMM) on surfaces can be strongly modified by the molecular packing in nanometric films/aggregates or by interactions with the substrate, which affect the molecular orientation and geometry. Detailed investigations of the magnetism of thin SMM films and nanostructures are necessary for the development of spin-based molecular devices, however this task is challenged by the limited sensitivity of laboratory-based magnetometric techniques and often requires access to synchrotron light sources to perform surface sensitive X-ray magnetic circular dichroism (XMCD) investigations. Here we show that low-temperature magnetic force microscopy is an alternative powerful laboratory tool able to extract the field dependence of the magnetization and to identify areas of in-plane and perpendicular magnetic anisotropy in microarrays of the SMM terbium(III) bis-phthalocyaninato (TbPc2) neutral complex grown as nanosized films on SiO2 and perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA), and this is in agreement with data extracted from nonlocal XMCD measurements performed on homogeneous TbPc2/PTCDA films.
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Affiliation(s)
- Michele Serri
- Laboratory for Molecular Magnetism (LA.M.M.), Department of Chemistry "Ugo Schiff", Università degli Studi di Firenze via della Lastruccia 3-13, I-50019 Sesto Fiorentino, Italy
- INSTM Research Unit of Firenze , via della Lastruccia 3, I-50019 Sesto Fiorentino, Italy
| | - Matteo Mannini
- Laboratory for Molecular Magnetism (LA.M.M.), Department of Chemistry "Ugo Schiff", Università degli Studi di Firenze via della Lastruccia 3-13, I-50019 Sesto Fiorentino, Italy
- INSTM Research Unit of Firenze , via della Lastruccia 3, I-50019 Sesto Fiorentino, Italy
| | - Lorenzo Poggini
- Laboratory for Molecular Magnetism (LA.M.M.), Department of Chemistry "Ugo Schiff", Università degli Studi di Firenze via della Lastruccia 3-13, I-50019 Sesto Fiorentino, Italy
- INSTM Research Unit of Firenze , via della Lastruccia 3, I-50019 Sesto Fiorentino, Italy
| | - Emilio Vélez-Fort
- European Synchrotron Radiation Facility , 71 Av. Martyrs, F-38043 Grenoble 9, France
| | - Brunetto Cortigiani
- Laboratory for Molecular Magnetism (LA.M.M.), Department of Chemistry "Ugo Schiff", Università degli Studi di Firenze via della Lastruccia 3-13, I-50019 Sesto Fiorentino, Italy
- INSTM Research Unit of Firenze , via della Lastruccia 3, I-50019 Sesto Fiorentino, Italy
| | - Philippe Sainctavit
- Institut de Mineralogie, de Physique des Materiaux et de Cosmochimie, UMR 7590, CNRS, UPMC, IRD, MNHN , F-75005 Paris, France
- Synchrotron SOLEIL, L'Orme des Merisiers , Saint-Aubin-BP 48, F-91192 Gif-sur-Yvette, France
| | - Donella Rovai
- Laboratory for Molecular Magnetism (LA.M.M.), Department of Chemistry "Ugo Schiff", Università degli Studi di Firenze via della Lastruccia 3-13, I-50019 Sesto Fiorentino, Italy
- INSTM Research Unit of Firenze , via della Lastruccia 3, I-50019 Sesto Fiorentino, Italy
| | - Andrea Caneschi
- Laboratory for Molecular Magnetism (LA.M.M.), Department of Chemistry "Ugo Schiff", Università degli Studi di Firenze via della Lastruccia 3-13, I-50019 Sesto Fiorentino, Italy
- INSTM Research Unit of Firenze , via della Lastruccia 3, I-50019 Sesto Fiorentino, Italy
| | - Roberta Sessoli
- Laboratory for Molecular Magnetism (LA.M.M.), Department of Chemistry "Ugo Schiff", Università degli Studi di Firenze via della Lastruccia 3-13, I-50019 Sesto Fiorentino, Italy
- INSTM Research Unit of Firenze , via della Lastruccia 3, I-50019 Sesto Fiorentino, Italy
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16
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Kuch W, Bernien M. Controlling the magnetism of adsorbed metal-organic molecules. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:023001. [PMID: 27841987 DOI: 10.1088/0953-8984/29/2/023001] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Gaining control on the size or the direction of the magnetic moment of adsorbed metal-organic molecules constitutes an important step towards the realization of a surface-mounted molecular spin electronics. Such control can be gained by taking advantage of interactions of the molecule's magnetic moment with the environment. The paramagnetic moments of adsorbed metal-organic molecules, for example, can be controlled by the interaction with magnetically ordered substrates. Metalloporphyrins and -phthalocyanines display a quasi-planar geometry, allowing the central metal ion to interact with substrate electronic states. This can lead to magnetic coupling with a ferromagnetic or even antiferromagnetic substrate. The molecule-substrate coupling can be mediated and controlled by insertion layers such as oxygen atoms, graphene, or nonmagnetic metal layers. Control on the magnetic properties of adsorbed metalloporphyrins or -phthalocyanines can also be gained by on-surface chemical modification of the molecules. The magnetic moment or the magnetic coupling to ferromagnetic substrates can be changed by adsorption and thermal desorption of small molecules that interact with the fourfold-coordinated metal center via the remaining axial coordination site. Spin-crossover molecules, which possess a metastable spin state that can be switched by external stimuli such as temperature or light, are another promising class of candidates for control of magnetic properties. However, the immobilization of such molecules on a solid surface often results in a quench of the spin transition due to the interaction with the substrate. We present examples of Fe(II) spin-crossover complexes in direct contact with a solid surface that undergo a reversible spin-crossover transition as a function of temperature, by illumination with visible light, or can be switched by the tip of a scanning tunneling microscope.
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Affiliation(s)
- Wolfgang Kuch
- Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
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17
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Bartolomé E, Arauzo A, Luzón J, Bartolomé J, Bartolomé F. Magnetic Relaxation of Lanthanide-Based Molecular Magnets. HANDBOOK OF MAGNETIC MATERIALS 2017. [DOI: 10.1016/bs.hmm.2017.09.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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18
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Marocchi S, Candini A, Klar D, Van den Heuvel W, Huang H, Troiani F, Corradini V, Biagi R, De Renzi V, Klyatskaya S, Kummer K, Brookes NB, Ruben M, Wende H, Del Pennino U, Soncini A, Affronte M, Bellini V. Relay-Like Exchange Mechanism through a Spin Radical between TbPc 2 Molecules and Graphene/Ni(111) Substrates. ACS NANO 2016; 10:9353-9360. [PMID: 27726335 DOI: 10.1021/acsnano.6b04107] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We investigate the electronic and magnetic properties of TbPc2 single ion magnets adsorbed on a graphene/Ni(111) substrate, by density functional theory (DFT), ab initio complete active space self-consistent field calculations, and X-ray magnetic circular dichroism (XMCD) experiments. Despite the presence of the graphene decoupling layer, a sizable antiferromagnetic coupling between Tb and Ni is observed in the XMCD experiments. The molecule-surface interaction is rationalized by the DFT analysis and is found to follow a relay-like communication pathway, where the radical spin on the organic Pc ligands mediates the interaction between Tb ion and Ni substrate spins. A model Hamiltonian which explicitly takes into account the presence of the spin radical is then developed, and the different magnetic interactions at play are assessed by first-principle calculations and by comparing the calculated magnetization curves with XMCD data. The relay-like mechanism is at the heart of the process through which the spin information contained in the Tb ion is sensed and exploited in carbon-based molecular spintronics devices.
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Affiliation(s)
- Simone Marocchi
- S3, Istituto Nanoscienze, CNR , Via Campi 213/A, Modena 41125, Italy
- Universidade de Sao Paulo (IFSC) , Av. Trabalhador são-carlense, São Carlos 400, Brazil
| | - Andrea Candini
- S3, Istituto Nanoscienze, CNR , Via Campi 213/A, Modena 41125, Italy
| | - David Klar
- Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen , Lotharstrasse 1, Duisburg D-47048, Germany
| | | | - Haibei Huang
- School of Chemistry, University of Melbourne , Melbourne, Victoria 3010, Australia
| | - Filippo Troiani
- S3, Istituto Nanoscienze, CNR , Via Campi 213/A, Modena 41125, Italy
| | - Valdis Corradini
- S3, Istituto Nanoscienze, CNR , Via Campi 213/A, Modena 41125, Italy
| | - Roberto Biagi
- S3, Istituto Nanoscienze, CNR , Via Campi 213/A, Modena 41125, Italy
- Dipartimento di Scienze Fisiche, Matematiche e Informatiche, Universitá di Modena e Reggio Emilia , Via Campi 213/A, Modena 41125, Italy
| | - Valentina De Renzi
- S3, Istituto Nanoscienze, CNR , Via Campi 213/A, Modena 41125, Italy
- Dipartimento di Scienze Fisiche, Matematiche e Informatiche, Universitá di Modena e Reggio Emilia , Via Campi 213/A, Modena 41125, Italy
| | - Svetlana Klyatskaya
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT) , Eggenstein-Leopoldshafen D-76344, Germany
| | - Kurt Kummer
- European Synchrotron Radiation Facility (ESRF) , Avenue des Martyrs 71, Grenoble 38043, France
| | - Nicholas B Brookes
- European Synchrotron Radiation Facility (ESRF) , Avenue des Martyrs 71, Grenoble 38043, France
| | - Mario Ruben
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT) , Eggenstein-Leopoldshafen D-76344, Germany
- Institut de Physique et Chimie des Materiaux de Strasbourg, UMR 7504 UdS-CNRS , Strasbourg 67034 Cedex 2, France
| | - Heiko Wende
- Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen , Lotharstrasse 1, Duisburg D-47048, Germany
| | - Umberto Del Pennino
- S3, Istituto Nanoscienze, CNR , Via Campi 213/A, Modena 41125, Italy
- Dipartimento di Scienze Fisiche, Matematiche e Informatiche, Universitá di Modena e Reggio Emilia , Via Campi 213/A, Modena 41125, Italy
| | - Alessandro Soncini
- School of Chemistry, University of Melbourne , Melbourne, Victoria 3010, Australia
| | - Marco Affronte
- S3, Istituto Nanoscienze, CNR , Via Campi 213/A, Modena 41125, Italy
- Dipartimento di Scienze Fisiche, Matematiche e Informatiche, Universitá di Modena e Reggio Emilia , Via Campi 213/A, Modena 41125, Italy
| | - Valerio Bellini
- S3, Istituto Nanoscienze, CNR , Via Campi 213/A, Modena 41125, Italy
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19
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Wäckerlin C, Donati F, Singha A, Baltic R, Rusponi S, Diller K, Patthey F, Pivetta M, Lan Y, Klyatskaya S, Ruben M, Brune H, Dreiser J. Giant Hysteresis of Single-Molecule Magnets Adsorbed on a Nonmagnetic Insulator. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:5195-5199. [PMID: 27159732 DOI: 10.1002/adma.201506305] [Citation(s) in RCA: 89] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 04/02/2016] [Indexed: 06/05/2023]
Abstract
TbPc2 single-molecule magnets adsorbed on a magnesium oxide tunnel barrier exhibit record magnetic remanence, record hysteresis opening, perfect out-of-plane alignment of the magnetic easy axes, and self-assembly into a well-ordered layer.
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Affiliation(s)
- Christian Wäckerlin
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Fabio Donati
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Aparajita Singha
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Romana Baltic
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Stefano Rusponi
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Katharina Diller
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - François Patthey
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Marina Pivetta
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Yanhua Lan
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), D-76344, Eggenstein-Leopoldshafen, Germany
| | - Svetlana Klyatskaya
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), D-76344, Eggenstein-Leopoldshafen, Germany
| | - Mario Ruben
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), D-76344, Eggenstein-Leopoldshafen, Germany
- Institut de Physique et Chimie des Matériaux (IPCMS), Université de Strasbourg, F-67034, Strasbourg, France
| | - Harald Brune
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Jan Dreiser
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
- Swiss Light Source, Paul Scherrer Institut (PSI), CH-5232, Villigen, Switzerland
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20
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Serrano G, Wiespointner-Baumgarthuber S, Tebi S, Klyatskaya S, Ruben M, Koch R, Müllegger S. Bilayer of Terbium Double-Decker Single-Molecule Magnets. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2016; 120:13581-13586. [PMID: 27390613 PMCID: PMC4931617 DOI: 10.1021/acs.jpcc.6b03676] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Revised: 05/17/2016] [Indexed: 05/10/2023]
Abstract
We report a low-temperature scanning tunneling microscopy and spectroscopy study of the structural and electronic properties of a bilayer of terbium double-decker (bis(phthalocyaninato)terbium(III), TbPc2) molecules on Au(111) at 5 K. The TbPc2 molecules are found to adsorb flat on top of a first compact TbPc2 monolayer on Au(111), forming a square-like packing similar to the underlying first layer. Their frontier-orbital electronic structure, measured by tunneling conductance spectroscopy, clearly differs from that of the underlying first monolayer. Our results of second-layer molecules indicate the absence of, both, hybrid molecule-substrate electronic states close to the Fermi level and a zero-bias Kondo resonance. We attribute these findings to a decreased electronic coupling with the Au(111) substrate.
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Affiliation(s)
- Giulia Serrano
- Institute
of Semiconductor and Solid State Physics, Johannes Kepler University, 4040 Linz, Austria
- E-mail: . Phone: +43 73224689643. Fax: +43 73224689696
| | | | - Stefano Tebi
- Institute
of Semiconductor and Solid State Physics, Johannes Kepler University, 4040 Linz, Austria
| | - Svetlana Klyatskaya
- Institute
of Nanotechnology, Karlsruhe Institute of
Technology, 76344 Eggenstein-Leopoldshafen, Germany
| | - Mario Ruben
- Institute
of Nanotechnology, Karlsruhe Institute of
Technology, 76344 Eggenstein-Leopoldshafen, Germany
- Institut
de Physique et de Chimie des Materiaux de Strasbourg, Universite de Strasbourg, CNRS UMP 7504, 23 Rue du Loess, Strasbourg 67034 Cedex 2, France
| | - Reinhold Koch
- Institute
of Semiconductor and Solid State Physics, Johannes Kepler University, 4040 Linz, Austria
| | - Stefan Müllegger
- Institute
of Semiconductor and Solid State Physics, Johannes Kepler University, 4040 Linz, Austria
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21
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Bi Y, Chen C, Zhao YF, Zhang YQ, Jiang SD, Wang BW, Han JB, Sun JL, Bian ZQ, Wang ZM, Gao S. Thermostability and photoluminescence of Dy(iii) single-molecule magnets under a magnetic field. Chem Sci 2016; 7:5020-5031. [PMID: 30155153 PMCID: PMC6018642 DOI: 10.1039/c6sc01157h] [Citation(s) in RCA: 86] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 05/12/2016] [Indexed: 01/20/2023] Open
Abstract
A series of compounds [ADyL4]·[solvent] composed of a dysprosium(iii) ion coordinated by four chelated naphthyridine-like ligands (L = 4-hydroxy-8-methyl-1,5-naphthyridine-3-carbonitrile) and an alkali metal ion (A = Na, K, Rb, Cs) were synthesized and characterized. They behave as single-molecule magnets under a zero dc field with an effective energy barrier of around 95 cm-1. Meanwhile, the main part, [ADyL4], of these SMMs is thermostable and sublimable. The geometric structures of three sublimed compounds are identical to the original ones without solvents, which is confirmed by X-ray diffraction using single crystal and powder samples. The static and dynamic magnetic properties remain unchanged before and after sublimation. Luminescence measurements at 5-77 K were performed to verify the energy gap between low-lying states and to understand the pathway of the thermal relaxation process of magnetization, as well as to inspect the tiny variation in magnetic sublevels for the ground term of Dy(iii). The photoluminescence spectra under a magnetic field (0-36 T) for the Dy-SMMs are investigated for the first time. The energy splitting of the two lowest sublevels of the ground term 6H15/2 of Dy(iii) are analyzed using the Zeeman formula.
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Affiliation(s)
- Ye Bi
- Beijing National Laboratory for Molecular Sciences , State Key Laboratory of Rare Earth Materials Chemistry and Applications , College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China . ;
| | - Cheng Chen
- Wuhan National High Magnetic Center , Huazhong University of Science and Technology , Wuhan 430074 , China
| | - Yi-Fang Zhao
- Beijing National Laboratory for Molecular Sciences , State Key Laboratory of Rare Earth Materials Chemistry and Applications , College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China . ;
| | - Yi-Quan Zhang
- Jiangsu Key Laboratory for NSLSCS , School of Physical Science and Technology , Nanjing Normal University , Nanjing 210023 , China
| | - Shang-Da Jiang
- Beijing National Laboratory for Molecular Sciences , State Key Laboratory of Rare Earth Materials Chemistry and Applications , College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China . ;
| | - Bing-Wu Wang
- Beijing National Laboratory for Molecular Sciences , State Key Laboratory of Rare Earth Materials Chemistry and Applications , College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China . ;
| | - Jun-Bo Han
- Wuhan National High Magnetic Center , Huazhong University of Science and Technology , Wuhan 430074 , China
| | - Jun-Liang Sun
- Beijing National Laboratory for Molecular Sciences , State Key Laboratory of Rare Earth Materials Chemistry and Applications , College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China . ;
| | - Zu-Qiang Bian
- Beijing National Laboratory for Molecular Sciences , State Key Laboratory of Rare Earth Materials Chemistry and Applications , College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China . ;
| | - Zhe-Ming Wang
- Beijing National Laboratory for Molecular Sciences , State Key Laboratory of Rare Earth Materials Chemistry and Applications , College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China . ;
| | - Song Gao
- Beijing National Laboratory for Molecular Sciences , State Key Laboratory of Rare Earth Materials Chemistry and Applications , College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China . ;
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22
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Candini A, Klar D, Marocchi S, Corradini V, Biagi R, De Renzi V, Del Pennino U, Troiani F, Bellini V, Klyatskaya S, Ruben M, Kummer K, Brookes NB, Huang H, Soncini A, Wende H, Affronte M. Spin-communication channels between Ln(III) bis-phthalocyanines molecular nanomagnets and a magnetic substrate. Sci Rep 2016; 6:21740. [PMID: 26907811 PMCID: PMC4764849 DOI: 10.1038/srep21740] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Accepted: 01/25/2016] [Indexed: 12/03/2022] Open
Abstract
Learning the art of exploiting the interplay between different units at the atomic scale is a fundamental step in the realization of functional nano-architectures and interfaces. In this context, understanding and controlling the magnetic coupling between molecular centers and their environment is still a challenging task. Here we present a combined experimental-theoretical work on the prototypical case of the bis(phthalocyaninato)-lanthanide(III) (LnPc2) molecular nanomagnets magnetically coupled to a Ni substrate. By means of X-ray magnetic circular dichroism we show how the coupling strength can be tuned by changing the Ln ion. The microscopic parameters of the system are determined by ab-initio calculations and then used in a spin Hamiltonian approach to interpret the experimental data. By this combined approach we identify the features of the spin communication channel: the spin path is first realized by the mediation of the external (5d) electrons of the Ln ion, keeping the characteristic features of the inner 4 f orbitals unaffected, then through the organic ligand, acting as a bridge to the external world.
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Affiliation(s)
- A Candini
- Centro S3, Istituto Nanoscienze - CNR, via G. Campi 213/A, 41125 Modena, Italy
| | - D Klar
- Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Lotharstraße 1, D-47048 Duisburg, Germany
| | - S Marocchi
- Centro S3, Istituto Nanoscienze - CNR, via G. Campi 213/A, 41125 Modena, Italy
| | - V Corradini
- Centro S3, Istituto Nanoscienze - CNR, via G. Campi 213/A, 41125 Modena, Italy
| | - R Biagi
- Centro S3, Istituto Nanoscienze - CNR, via G. Campi 213/A, 41125 Modena, Italy.,Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Università di Modena e Reggio Emilia via G. Campi 213/A, 41125 Modena, Italy
| | - V De Renzi
- Centro S3, Istituto Nanoscienze - CNR, via G. Campi 213/A, 41125 Modena, Italy.,Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Università di Modena e Reggio Emilia via G. Campi 213/A, 41125 Modena, Italy
| | - U Del Pennino
- Centro S3, Istituto Nanoscienze - CNR, via G. Campi 213/A, 41125 Modena, Italy.,Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Università di Modena e Reggio Emilia via G. Campi 213/A, 41125 Modena, Italy
| | - F Troiani
- Centro S3, Istituto Nanoscienze - CNR, via G. Campi 213/A, 41125 Modena, Italy
| | - V Bellini
- Centro S3, Istituto Nanoscienze - CNR, via G. Campi 213/A, 41125 Modena, Italy
| | - S Klyatskaya
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), D-76344 Eggenstein-Leopoldshafen, Germany
| | - M Ruben
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), D-76344 Eggenstein-Leopoldshafen, Germany.,Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 UdS-CNRS, 67034 Strasbourg Cedex 2, France
| | - K Kummer
- European Synchrotron Radiation Facility (ESRF), 71 Avenue des Martyrs, 38043 Grenoble, France
| | - N B Brookes
- European Synchrotron Radiation Facility (ESRF), 71 Avenue des Martyrs, 38043 Grenoble, France
| | - H Huang
- School of Chemistry, The University of Melbourne, 3010 Victoria, Australia
| | - A Soncini
- School of Chemistry, The University of Melbourne, 3010 Victoria, Australia
| | - H Wende
- Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Lotharstraße 1, D-47048 Duisburg, Germany
| | - M Affronte
- Centro S3, Istituto Nanoscienze - CNR, via G. Campi 213/A, 41125 Modena, Italy.,Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Università di Modena e Reggio Emilia via G. Campi 213/A, 41125 Modena, Italy
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23
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Single-molecule magnetism of tetrapyrrole lanthanide compounds with sandwich multiple-decker structures. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2015.07.004] [Citation(s) in RCA: 157] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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McInnes EJL, Timco GA, Whitehead GFS, Winpenny REP. Heterometallic Rings: Their Physics and use as Supramolecular Building Blocks. Angew Chem Int Ed Engl 2015; 54:14244-69. [PMID: 26459810 DOI: 10.1002/anie.201502730] [Citation(s) in RCA: 96] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Indexed: 11/10/2022]
Abstract
An enormous family of heterometallic rings has been made. The first were Cr7 M rings where M = Ni(II), Zn(II), Mn(II), and rings have been made with as many as fourteen metal centers in the cyclic structure. They are bridged externally by carboxylates, and internally by fluorides or a penta-deprotonated polyol. The size of the rings is controlled through templates which have included a range of ammonium or imidazolium ions, alkali metals and coordination compounds. The rings can be functionalized to act as ligands, and incorporated into hybrid organic-inorganic rotaxanes and into molecules containing up to 200 metal centers. Physical studies reported include: magnetic measurements, inelastic neutron scattering (including single crystal measurements), electron paramagnetic resonance spectroscopy (including measurements of phase memory times), NMR spectroscopy (both solution and solid state), and polarized neutron diffraction. The rings are hence ideal for understanding magnetism in elegant exchange-coupled systems.
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Affiliation(s)
- Eric J L McInnes
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL (UK)
| | - Grigore A Timco
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL (UK)
| | - George F S Whitehead
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL (UK)
| | - Richard E P Winpenny
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL (UK).
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25
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McInnes EJL, Timco GA, Whitehead GFS, Winpenny REP. Heterometallische Ringe: physikalische Eigenschaften und Verwendung als supramolekulare Bausteine. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201502730] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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26
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Bertani F, Cristiani N, Mannini M, Pinalli R, Sessoli R, Dalcanale E. Iodinated Bis(phthalocyaninato)terbium(III) Complexes: Versatile Platforms for Functionalization of Single-Molecule Magnets through Sonogashira Reaction. European J Org Chem 2015. [DOI: 10.1002/ejoc.201501015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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27
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Erler P, Schmitt P, Barth N, Irmler A, Bouvron S, Huhn T, Groth U, Pauly F, Gragnaniello L, Fonin M. Highly Ordered Surface Self-Assembly of Fe₄ Single Molecule Magnets. NANO LETTERS 2015; 15:4546-52. [PMID: 26086677 DOI: 10.1021/acs.nanolett.5b01120] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Single molecule magnets (SMMs) have attracted considerable attention due to low-temperature magnetic hysteresis and fascinating quantum effects. The investigation of these properties requires the possibility to deposit well-defined monolayers or spatially isolated molecules within a well-controlled adsorption geometry. Here we present a successful fabrication of self-organized arrays of Fe4 SMMs on hexagonal boron nitride (h-BN) on Rh(111) as template. Using a rational design of the ligand shell optimized for surface assembly and electrospray as a gentle deposition method, we demonstrate how to obtain ordered arrays of molecules forming perfect hexagonal superlattices of tunable size, from small islands to an almost perfect monolayer. High-resolution low temperature scanning tunneling microscopy (STM) reveals that the Fe4 molecule adsorbs on the substrate in a flat geometry, meaning that its magnetic easy axis is perpendicular to the surface. By scanning tunneling spectroscopy (STS) and density functional theory (DFT) calculations, we infer that the majority- and minority-spin components of the spin-split lowest unoccupied molecular orbital (LUMO) can be addressed separately on a submolecular level.
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Affiliation(s)
- Philipp Erler
- †Department of Physics and ‡Department of Chemistry, University of Konstanz, 78457 Konstanz, Germany
| | | | - Nicole Barth
- †Department of Physics and ‡Department of Chemistry, University of Konstanz, 78457 Konstanz, Germany
| | - Andreas Irmler
- †Department of Physics and ‡Department of Chemistry, University of Konstanz, 78457 Konstanz, Germany
| | - Samuel Bouvron
- †Department of Physics and ‡Department of Chemistry, University of Konstanz, 78457 Konstanz, Germany
| | | | | | - Fabian Pauly
- †Department of Physics and ‡Department of Chemistry, University of Konstanz, 78457 Konstanz, Germany
| | - Luca Gragnaniello
- †Department of Physics and ‡Department of Chemistry, University of Konstanz, 78457 Konstanz, Germany
| | - Mikhail Fonin
- †Department of Physics and ‡Department of Chemistry, University of Konstanz, 78457 Konstanz, Germany
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28
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Dreiser J. Molecular lanthanide single-ion magnets: from bulk to submonolayers. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:183203. [PMID: 25893740 DOI: 10.1088/0953-8984/27/18/183203] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Single-ion magnets (SIMs) are mononuclear molecular complexes exhibiting slow relaxation of magnetization. They are currently attracting a lot of interest because of potential applications in spintronics and quantum information processing. However, exploiting SIMs in, e.g. molecule-inorganic hybrid devices requires a fundamental understanding of the effects of molecule-substrate interactions on the SIM magnetic properties. In this review the properties of lanthanide SIMs in the bulk crystalline phase and deposited on surfaces in the (sub)monolayer regime are discussed. As a starting point trivalent lanthanide ions in a ligand field will be described, and the challenges in characterizing the ligand field are illustrated with a focus on several spectroscopic techniques which are able to give direct information on the ligand-field split energy levels. Moreover, the dominant mechanisms of magnetization relaxation in the bulk phase are discussed followed by an overview of SIMs relevant for surface deposition. Further, a short introduction will be given on x-ray absorption spectroscopy, x-ray magnetic circular dichroism and scanning tunneling microscopy. Finally, the recent experiments on surface-deposited SIMs will be reviewed, along with a discussion of future perspectives.
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Affiliation(s)
- J Dreiser
- Ecole Polytechnique Fédérale de Lausanne, ICMP, Station 3, CH-1015 Lausanne, Switzerland. Paul Scherrer Institut, Swiss Light Source, CH-5232 Villigen PSI, Switzerland
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29
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Westerström R, Uldry AC, Stania R, Dreiser J, Piamonteze C, Muntwiler M, Matsui F, Rusponi S, Brune H, Yang S, Popov A, Büchner B, Delley B, Greber T. Surface aligned magnetic moments and hysteresis of an endohedral single-molecule magnet on a metal. PHYSICAL REVIEW LETTERS 2015; 114:087201. [PMID: 25768775 DOI: 10.1103/physrevlett.114.087201] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2014] [Indexed: 06/04/2023]
Abstract
The interaction between the endohedral unit in the single-molecule magnet Dy_{2}ScN@C_{80} and a rhodium (111) substrate leads to alignment of the Dy 4f orbitals. The resulting orientation of the Dy_{2}ScN plane parallel to the surface is inferred from comparison of the angular anisotropy of x-ray absorption spectra and multiplet calculations in the corresponding ligand field. The x-ray magnetic circular dichroism is also angle dependent and signals strong magnetocrystalline anisotropy. This directly relates geometric and magnetic structure. Element specific magnetization curves from different coverages exhibit hysteresis at a sample temperature of ∼4 K. From the measured hysteresis curves, we estimate the zero field remanence lifetime during x-ray exposure of a submonolayer to be about 30 seconds.
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Affiliation(s)
- Rasmus Westerström
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
- Department of Physics and Astronomy, Uppsala University, Box 516, S-751 20 Uppsala, Sweden
| | | | - Roland Stania
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Jan Dreiser
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
- Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Cinthia Piamonteze
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Matthias Muntwiler
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Fumihiko Matsui
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
- Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara 630-0192, Japan
| | - Stefano Rusponi
- Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Harald Brune
- Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Shangfeng Yang
- Hefei National Laboratory for Physical Sciences at Microscale, Department of Materials Science and Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei 230026, China
| | - Alexey Popov
- Leibniz Institute of Solid State and Materials Research, Dresden, D-01069 Dresden, Germany
| | - Bernd Büchner
- Leibniz Institute of Solid State and Materials Research, Dresden, D-01069 Dresden, Germany
| | - Bernard Delley
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Thomas Greber
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
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30
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Malavolti L, Lanzilotto V, Ninova S, Poggini L, Cimatti I, Cortigiani B, Margheriti L, Chiappe D, Otero E, Sainctavit P, Totti F, Cornia A, Mannini M, Sessoli R. Magnetic bistability in a submonolayer of sublimated Fe4 single-molecule magnets. NANO LETTERS 2015; 15:535-541. [PMID: 25489967 DOI: 10.1021/nl503925h] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We demonstrate that Fe4 molecules can be deposited on gold by thermal sublimation in ultra-high vacuum with retention of single molecule magnet behavior. A magnetic hysteresis comparable to that found in bulk samples is indeed observed when a submonolayer film is studied by X-ray magnetic circular dichroism. Scanning tunneling microscopy evidences that Fe4 molecules are assembled in a two-dimensional lattice with short-range hexagonal order and coexist with a smaller contaminant. The presence of intact Fe4 molecules and the retention of their bistable magnetic behavior on the gold surface are supported by density functional theory calculations.
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Affiliation(s)
- Luigi Malavolti
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit, University of Florence , 50019 Sesto Fiorentino, Italy
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31
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Bian Y, Jiang J. Recent Advances in Phthalocyanine-Based Functional Molecular Materials. STRUCTURE AND BONDING 2015. [DOI: 10.1007/430_2015_194] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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32
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Jung J, Cador O, Bernot K, Pointillart F, Luzon J, Le Guennic B. Influence of the supramolecular architecture on the magnetic properties of a Dy(III) single-molecule magnet: an ab initio investigation. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2014; 5:2267-2274. [PMID: 25551055 PMCID: PMC4273297 DOI: 10.3762/bjnano.5.236] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Accepted: 10/05/2014] [Indexed: 06/04/2023]
Abstract
Single-crystal angular-resolved magnetometry and wavefunction-based calculations have been used to reconsider the magnetic properties of a recently reported Dy(III)-based single-molecule magnet, namely [Dy(hfac)3(L(1))] with hfac(-) = 1,1,1,5,5,5-hexafluoroacetylacetonate and L(1) = 2-(4,5-bis(propylthio)-1,3-dithiol-2-ylidene)-6-(pyridin-2-yl)-5H-[1,3]dithiolo[4',5':4,5]benzo[1,2-d]imidazole. The magnetic susceptibility and magnetization at low temperature are found to be strongly influenced by supramolecular interactions. Moreover, taking into account the hydrogen-bond networks in the calculations allows to explain the orientation of the magnetic axes. This strongly suggests that hydrogen bonds play an important role in the modulation of the electrostatic environment around the Dy(III) center that governs the nature of its magnetic ground-state and the orientation of its anisotropy axes. We thus show here that SMM properties that rely on supramolecular organization may not be transferable into single-molecule devices.
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Affiliation(s)
- Julie Jung
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France
| | - Olivier Cador
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France
| | - Kevin Bernot
- INSA, ISCR, UMR 6226, Université Européenne de Bretagne, 35708 Rennes, France
| | - Fabrice Pointillart
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France
| | - Javier Luzon
- Instituto de Ciencia de Materiales de Aragon, CSIC–Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
- Centro Universitario de la Defensa, Academia General Militar, Zaragoza, Spain
| | - Boris Le Guennic
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France
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