1
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Shukla P, Pal TK, Sahoo SC, Du M, Kong X, Das S. New Family of Heptanuclear Lanthanide {Ln
7
} Clusters: Synthesis, Structure, and Magnetic Studies. ChemistrySelect 2021. [DOI: 10.1002/slct.202100032] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Pooja Shukla
- Department of Basic Sciences, Chemistry Discipline Institute of Infrastructure Technology Research And Management Near Khokhra Circle, Maninagar East Ahmedabad 380026 Gujarat India
| | - Tapan K. Pal
- Department of Chemistry School of Technology Pandit Deendayal Petroleum University Gandhinagar 382007 Gujarat India
| | | | - Ming‐Hao Du
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China
| | - Xiang‐Jian Kong
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China
| | - Sourav Das
- Department of Basic Sciences, Chemistry Discipline Institute of Infrastructure Technology Research And Management Near Khokhra Circle, Maninagar East Ahmedabad 380026 Gujarat India
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2
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Sanakis Y, Krzystek J, Maganas D, Grigoropoulos A, Ferentinos E, Kostakis MG, Petroulea V, Pissas M, Thirunavukkuarasu K, Wernsdorfer W, Neese F, Kyritsis P. Magnetic Properties and Electronic Structure of the S = 2 Complex [Mn III{(OPPh 2) 2N} 3] Showing Field-Induced Slow Magnetization Relaxation. Inorg Chem 2020; 59:13281-13294. [PMID: 32897702 DOI: 10.1021/acs.inorgchem.0c01636] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The high-spin S = 2 Mn(III) complex [Mn{(OPPh2)2N}3] (1Mn) exhibits field-induced slow relaxation of magnetization (Inorg. Chem. 2013, 52, 12869). Magnetic susceptibility and dual-mode X-band electron paramagnetic resonance (EPR) studies revealed a negative value of the zero-field-splitting (zfs) parameter D. In order to explore the magnetic and electronic properties of 1Mn in detail, a combination of experimental and computational studies is presented herein. Alternating-current magnetometry on magnetically diluted samples (1Mn/1Ga) of 1Mn in the diamagnetic gallium analogue, [Ga{(OPPh2)2N}3], indicates that the slow relaxation behavior of 1Mn is due to the intrinsic properties of the individual molecules of 1Mn. Investigation of the single-crystal magnetization of both 1Mn and 1Mn/1Ga by a micro-SQUID device reveals hysteresis loops below 1 K. Closed hysteresis loops at a zero direct-current magnetic field are observed and attributed to fast quantum tunneling of magnetization. High-frequency and -field EPR (HFEPR) spectroscopic studies reveal that, apart from the second-order zfs terms (D and E), fourth-order terms (B4m) are required in order to appropriately describe the magnetic properties of 1Mn. These studies provide accurate spin-Hamiltonian (sH) parameters of 1Mn, i.e., zfs parameters |D| = 3.917(5) cm-1, |E| = 0.018(4) cm-1, B04 = B42 = 0, and B44 = (3.6 ± 1.7) × 10-3 cm-1 and g = [1.994(5), 1.996(4), 1.985(4)], and confirm the negative sign of D. Parallel-mode X-band EPR studies on 1Mn/1Ga and CH2Cl2 solutions of 1Mn probe the electronic-nuclear hyperfine interactions in the solid state and solution. The electronic structure of 1Mn is investigated by quantum-chemical calculations by employing recently developed computational protocols that are grounded on ab initio wave function theory. From computational analysis, the contributions of spin-spin and spin-orbit coupling to the magnitude of D are obtained. The calculations provide also computed values of the fourth-order zfs terms B4m, as well as those of the g and hyperfine interaction tensor components. In all cases, a very good agreement between the computed and experimentally determined sH parameters is observed. The magnetization relaxation properties of 1Mn are rationalized on the basis of the composition of the ground-state wave functions in the absence or presence of an external magnetic field.
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Affiliation(s)
- Yiannis Sanakis
- Institute of Nanoscience and Nanotechnolgy, National Centre of Scientific Research "Demokritos", Aghia Paraskevi 15310, Attiki, Greece
| | - J Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Dimitrios Maganas
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Alexios Grigoropoulos
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, 15771 Athens, Greece
| | - Eleftherios Ferentinos
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, 15771 Athens, Greece
| | - Marios G Kostakis
- Analytical Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens,15771 Athens, Greece
| | - Vasiliki Petroulea
- Institute of Nanoscience and Nanotechnolgy, National Centre of Scientific Research "Demokritos", Aghia Paraskevi 15310, Attiki, Greece
| | - Michael Pissas
- Institute of Nanoscience and Nanotechnolgy, National Centre of Scientific Research "Demokritos", Aghia Paraskevi 15310, Attiki, Greece
| | | | - Wolfgang Wernsdorfer
- Physikalisches Institut, Karlsruher Institut für Technologie, Wolfgang-Gaede-Strasse 1, 76131 Karlsruhe, Germany.,Institute of Quantum Materials and Technologies, Karlsruher Institut für Technologie, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Frank Neese
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Panayotis Kyritsis
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, 15771 Athens, Greece
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3
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Oldengott JC, Schnack J, Glaser T. Optimization of Single‐Molecule Magnets by Suppression of Quantum Tunneling of the Magnetization. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000507] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jan Christian Oldengott
- Lehrstuhl für Anorganische Chemie I Fakultät für Chemie Universität Bielefeld Universitätsstr. 25 33615 Bielefeld Germany
| | - Jürgen Schnack
- Fakultät für Physik Universität Bielefeld Universitätsstr. 25 33615 Bielefeld Germany
| | - Thorsten Glaser
- Lehrstuhl für Anorganische Chemie I Fakultät für Chemie Universität Bielefeld Universitätsstr. 25 33615 Bielefeld Germany
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4
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Katoh K, Yasuda N, Damjanović M, Wernsdorfer W, Breedlove BK, Yamashita M. Manipulation of the Coordination Geometry along the C 4 Rotation Axis in a Dinuclear Tb 3+ Triple-Decker Complex via a Supramolecular Approach. Chemistry 2020; 26:4805-4815. [PMID: 31984579 DOI: 10.1002/chem.201905400] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 01/21/2020] [Indexed: 01/02/2023]
Abstract
A supramolecular complex (1⋅C60 ) was prepared by assembling (C60-Ih)[5,6]fullerene (C60 ) with the dinuclear Tb3+ triple-decker complex [(TPP)Tb(Pc)Tb(TPP)] (1: Tb3+ =trivalent terbium ion, Pc2- =phthalocyaninato, TPP2- =tetraphenylporphyrinato) with quasi-D4h symmetry to investigate the relationship between the coordination symmetry and single-molecule magnet (SMM) properties. Tb3+ -Pc triple-decker complexes (Tb2 Pc3 ) have an important advantage over Tb3+ -Pc double-decker complexes (TbPc2 ) since the magnetic relaxation processes correspond to the Zeeman splitting when there are two 4f spin systems. The two Tb3+ sites of 1 are equivalent, and the twist angle (φ) was determined to be 3.62°. On the other hand, the two Tb3+ sites of 1⋅C60 are not equivalent. The φ values for sites Tb1 and Tb2 were determined to be 3.67° and 33.8°, respectively, due to a change in the coordination symmetry of 1 upon association with C60 . At 1.8 K, 1 and 1⋅C60 undergo different magnetic relaxations, and the changes in the ground state affect the spin dynamics. Although 1 and 1⋅C60 relax via QTM in a zero applied magnetic field (H), H dependencies of the magnetic relaxation times (τ) for H>1500 Oe are similar. On the other hand, for H<1500 Oe, the τ values have different behaviors since the off-diagonal terms ( B k q ; q ≠ 0 ) affect the magnetic relaxation mechanism. From temperature (T) and H dependences of τ, spin-phonon interactions along with direct and Raman mechanisms explain the spin dynamics. We believe that a supramolecular method can be used to control the magnetic anisotropy along the C4 rotation axis and the spin dynamic properties in dinuclear Ln3+ -Pc multiple-decker complexes.
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Affiliation(s)
- Keiichi Katoh
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi, 980-8578, Japan
| | - Nobuhiro Yasuda
- Diffraction and Scattering Division, Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan
| | - Marko Damjanović
- Institute of Nanotechnology, KIT, 76344, Eggenstein-Leopoldshafen, Germany
| | - Wolfgang Wernsdorfer
- Institute of Nanotechnology, KIT, 76344, Eggenstein-Leopoldshafen, Germany.,Physikalisches Institut, KIT, Wolfgang-Gaede-Str. 1, 76131, Karlsruhe, Germany.,Institut Néel, CNRS, 38042, Grenoble, France
| | - Brian K Breedlove
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi, 980-8578, Japan
| | - Masahiro Yamashita
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi, 980-8578, Japan.,WPI Research Center, Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.,School of Materials Science and Engineering, Nankai University, Tianjin, 300350, P. R. China
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5
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Venne J, Feldscher B, Walleck S, Stammler A, Bögge H, Schnack J, Glaser T. Rational Improvement of Single‐Molecule Magnets by Enforcing Ferromagnetic Interactions. Chemistry 2019; 25:4992-5004. [DOI: 10.1002/chem.201805543] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 02/08/2019] [Indexed: 11/10/2022]
Affiliation(s)
- Jan‐Philipp Venne
- Lehrstuhl für Anorganische Chemie I, Fakultät für ChemieUniversität Bielefeld Universitätsstr. 25 33615 Bielefeld Germany
| | - Bastian Feldscher
- Lehrstuhl für Anorganische Chemie I, Fakultät für ChemieUniversität Bielefeld Universitätsstr. 25 33615 Bielefeld Germany
| | - Stephan Walleck
- Lehrstuhl für Anorganische Chemie I, Fakultät für ChemieUniversität Bielefeld Universitätsstr. 25 33615 Bielefeld Germany
| | - Anja Stammler
- Lehrstuhl für Anorganische Chemie I, Fakultät für ChemieUniversität Bielefeld Universitätsstr. 25 33615 Bielefeld Germany
| | - Hartmut Bögge
- Lehrstuhl für Anorganische Chemie I, Fakultät für ChemieUniversität Bielefeld Universitätsstr. 25 33615 Bielefeld Germany
| | - Jürgen Schnack
- Fakultät für PhysikUniversität Bielefeld Universitätsstr. 25 33615 Bielefeld Germany
| | - Thorsten Glaser
- Lehrstuhl für Anorganische Chemie I, Fakultät für ChemieUniversität Bielefeld Universitätsstr. 25 33615 Bielefeld Germany
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6
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Charilaou M, Braun HB, Löffler JF. Monopole-Induced Emergent Electric Fields in Ferromagnetic Nanowires. PHYSICAL REVIEW LETTERS 2018; 121:097202. [PMID: 30230864 DOI: 10.1103/physrevlett.121.097202] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Indexed: 06/08/2023]
Abstract
We predict that complete magnetization reversal in simple metallic ferromagnetic nanoparticles is directly linked to the pair creation of topological point defects in the form of hedgehog-antihedgehog pairs. These dynamical point defects move at exceptionally high speeds in excess of 1500 m/s, faster than any other known magnetic object. Their rapid motion generates unprecedented solenoidal emergent fields on the order of megavolts per meter, in analogy to the magnetic field of a moving electric charge, providing a striking example that a moving hedgehog constitutes an emergent magnetic monopole.
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Affiliation(s)
- Michalis Charilaou
- Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
| | - Hans-Benjamin Braun
- UCD School of Physics, University College Dublin, Dublin 04 V1W8, Ireland
- School of Theoretical Physics, Dublin Institute of Advanced Studies, Dublin 04 C932, Ireland
| | - Jörg F Löffler
- Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
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7
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Izuogu DC, Yoshida T, Zhang H, Cosquer G, Katoh K, Ogata S, Hasegawa M, Nojiri H, Damjanović M, Wernsdorfer W, Uruga T, Ina T, Breedlove BK, Yamashita M. Slow Magnetic Relaxation in a Palladium-Gadolinium Complex Induced by Electron Density Donation from the Palladium Ion. Chemistry 2018; 24:9285-9294. [PMID: 29663534 DOI: 10.1002/chem.201800699] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2018] [Revised: 04/12/2018] [Indexed: 11/06/2022]
Abstract
Incorporating palladium in the first coordination sphere of acetato-bridged lanthanoid complexes, [Pd2 Ln2 (H2 O)2 (AcO)10 ]⋅2 AcOH (Ln=Gd (1), Y (2), Gd0.4 Y1.6 (3), Eu (4)), led to significant bonding interactions between the palladium and the lanthanoid ions, which were demonstrated by experimental and theoretical methods. We found that electron density was donated from the d8 Pd2+ ion to Gd3+ ion in 1 and 3, leading to the observed slow magnetic relaxation by using local orbital locator (LOL) and X-ray absorption near-edge structure (XANES) analysis. Field-induced dual slow magnetic relaxation was observed for 1 up to 20 K. Complex 3 and frozen aqueous and acetonitrile solutions of 1 showed only one relaxation peak, which confirms the role of intermolecular dipolar interactions in slowing the magnetic relaxation of 1. The slow magnetic relaxation occurred through a combination of Orbach and Direct processes with the highest pre-exponential factor (τo =0.06 s) reported so far for a gadolinium complex exhibiting slow magnetic relaxation. The results revealed that transition metal-lanthanoid (TM-Ln) axial interactions indeed could lead to new physical properties by affecting both the electronic and magnetic states of the compounds.
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Affiliation(s)
- David C Izuogu
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Sendai, 980-8578, Japan.,Department of Pure & Industrial Chemistry, University of Nigeria, Nsukka, 410001, Nigeria.,Department of Chemistry, University of Cambridge, Lensfield Rd., Cambridge, CB2 1EW, UK
| | - Takefumi Yoshida
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Sendai, 980-8578, Japan.,Electronic Functional Macromolecules Group, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Japan
| | - Haitao Zhang
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Sendai, 980-8578, Japan
| | - Goulven Cosquer
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Sendai, 980-8578, Japan
| | - Keiichi Katoh
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Sendai, 980-8578, Japan
| | - Shuhei Ogata
- Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama-Gakuin University, Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5258, Japan
| | - Miki Hasegawa
- Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama-Gakuin University, Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5258, Japan
| | - Hiroyuki Nojiri
- Institute for Materials Research, Tohoku University, Sendai, Miyagi, 980-8577, Japan
| | - Marko Damjanović
- Physikalisches Institut and Institute of Nanotechnology, Karlsruhe Institute of Technology, Wolfgang-Gaede-Strasse 1, 76131, Karlsruhe, Germany
| | - Wolfgang Wernsdorfer
- Physikalisches Institut and Institute of Nanotechnology, Karlsruhe Institute of Technology, Wolfgang-Gaede-Strasse 1, 76131, Karlsruhe, Germany.,CNRS and Université Grenoble Alpes, Institut Néel, 38042, Grenoble, France
| | - Tomoya Uruga
- Research & Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI/SPring-8), 1-1-1 Kouto, Sayo, Hyogo, 679-5198, Japan
| | - Toshiaki Ina
- Research & Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI/SPring-8), 1-1-1 Kouto, Sayo, Hyogo, 679-5198, Japan
| | - Brian K Breedlove
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Sendai, 980-8578, Japan
| | - Masahiro Yamashita
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Sendai, 980-8578, Japan.,WPI-Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Sendai, 980-8577, Japan.,School of Materials Science and Engineering, Nankai University, Tianjin, 300350, China
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8
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Morita T, Damjanović M, Katoh K, Kitagawa Y, Yasuda N, Lan Y, Wernsdorfer W, Breedlove BK, Enders M, Yamashita M. Comparison of the Magnetic Anisotropy and Spin Relaxation Phenomenon of Dinuclear Terbium(III) Phthalocyaninato Single-Molecule Magnets Using the Geometric Spin Arrangement. J Am Chem Soc 2018; 140:2995-3007. [PMID: 29400960 DOI: 10.1021/jacs.7b12667] [Citation(s) in RCA: 81] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Herein we report the synthesis and characterization of a dinuclear TbIII single-molecule magnet (SMM) with two [TbPc2]0 units connected via a fused-phthalocyaninato ligand. The stable and robust complex [(obPc)Tb(Fused-Pc)Tb(obPc)] (1) was characterized by using synchrotron radiation measurements and other spectroscopic techniques (ESI-MS, FT-IR, UV). The magnetic couplings between the TbIII ions and the two π radicals present in 1 were explored by means of density functional theory (DFT). Direct and alternating current magnetic susceptibility measurements were conducted on magnetically diluted and nondiluted samples of 1, indicating this compound to be an SMM with improved properties compared to those of the well-known [TbPc2]-/0/+ and the axially symmetric dinuclear TbIII phthalocyaninato triple-decker complex (Tb2(obPc)3). Assuming that the probability of quantum tunneling of the magnetization (QTM) occurring in one TbPc2 unit is PQTM, the probability of QTM simultaneously occurring in 1 is PQTM2, meaning that QTM is effectively suppressed. Furthermore, nondiluted samples of 1 underwent slow magnetic relaxation times (τ ≈ 1000 s at 0.1 K), and the blocking temperature (TB) was determined to be ca. 16 K with an energy barrier for spin reversal (Ueff) of 588 cm-1 (847 K) due to D4d geometry and weak inter- and intramolecular magnetic interactions as an exchange bias (Hbias), reducing QTM. Four hyperfine steps were observed by micro-SQUID measurement. Furthermore, solution NMR measurements (one-dimensional, two-dimensional, and dynamic) were done on 1, which led to the determination of the high rotation barrier (83 ± 10 kJ/mol) of the obPc ligand. A comparison with previously reported TbIII triple-decker compounds shows that ambient temperature NMR measurements can indicate improvements in the design of coordination environments for SMMs. A large Ueff causes strong uniaxial magnetic anisotropy in 1, leading to a χax value (1.39 × 10-30 m3) that is larger than that for Tb2(obPc)3 (0.86 × 10-30 m3). Controlling the coordination environment and spin arrangement is an effective technique for suppressing QTM in TbPc2-based SMMs.
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Affiliation(s)
- Takaumi Morita
- Department of Chemistry, Graduate School of Science, Tohoku University , 6-3, Aramaki-Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - Marko Damjanović
- Institute of Inorganic Chemistry, Heidelberg University , Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany.,Physikalisches Institut and Institute of Nanotechnology, Karlsruhe Institute of Technology , Wolfgang-Gaede-Strasse 1, 76131 Karlsruhe, Germany
| | - Keiichi Katoh
- Department of Chemistry, Graduate School of Science, Tohoku University , 6-3, Aramaki-Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - Yasutaka Kitagawa
- Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University , 1-1 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
| | - Nobuhiro Yasuda
- Japan Synchrotron Radiation Research Institute (JASRI) , 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Yanhua Lan
- Physikalisches Institut and Institute of Nanotechnology, Karlsruhe Institute of Technology , Wolfgang-Gaede-Strasse 1, 76131 Karlsruhe, Germany
| | - Wolfgang Wernsdorfer
- Physikalisches Institut and Institute of Nanotechnology, Karlsruhe Institute of Technology , Wolfgang-Gaede-Strasse 1, 76131 Karlsruhe, Germany.,CNRS and Université Grenoble Alpes, Institut Néel , 38042 Grenoble, France
| | - Brian K Breedlove
- Department of Chemistry, Graduate School of Science, Tohoku University , 6-3, Aramaki-Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - Markus Enders
- Institute of Inorganic Chemistry, Heidelberg University , Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - Masahiro Yamashita
- Department of Chemistry, Graduate School of Science, Tohoku University , 6-3, Aramaki-Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan.,WPI Research Center, Advanced Institute for Materials Research, Tohoku University , 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.,School of Materials Science and Engineering, Nankai University , Tianjin 300350, China
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9
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Novitchi G, Jiang S, Shova S, Rida F, Hlavička I, Orlita M, Wernsdorfer W, Hamze R, Martins C, Suaud N, Guihéry N, Barra AL, Train C. From Positive to Negative Zero-Field Splitting in a Series of Strongly Magnetically Anisotropic Mononuclear Metal Complexes. Inorg Chem 2017; 56:14809-14822. [PMID: 29181984 DOI: 10.1021/acs.inorgchem.7b01861] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of mononuclear [M(hfa)2(pic)2] (Hhfa = 1,1,1,5,5,5-hexafluoro-2,4-pentanedione; pic = 4-methylpyridine; M = FeII, CoII, NiII, ZnII) compounds were obtained and characterized. The structures of the complexes have been resolved by single-crystal X-ray diffraction, indicating that, apart from the zinc derivative, the complexes are in a trans configuration. Moreover, a dramatic lenghthening of the Fe-N distances was observed, whereas the nickel(II) complex is almost perfectly octahedral. The magnetic anisotropy of these complexes was thoroughly studied by direct-current (dc) magnetic measurements, high-field electron paramagnetic resonance, and infrared (IR) magnetospectroscopy: the iron(II) derivative exhibits an out-of-plane anisotropy (DFe = -7.28 cm-1) with a high rhombicity, whereas the cobalt(II) and nickel(II) complexes show in-plane anisotropy (DCo ∼ 92-95 cm-1; DNi = 4.920 cm-1). Ab initio calculations were performed to rationalize the evolution of the structure and identify the excited states governing the magnetic anisotropy along the series. For the iron(II) complex, an out-of-phase alternating-current (ac) magnetic susceptibility signal was observed using a 0.1 T dc field. For the cobalt(II) derivative, the ac magnetic susceptibility shows the presence of two field-dependent relaxation phenomena: at low field (500 Oe), the relaxation process is beyond single-ion behavior, whereas at high field (2000 Oe), the relaxation of magnetization implies several mechanisms including an Orbach process with Ueff = 25 K and quantum tunneling of magnetization. The observation by μ-SQUID magnetization measurements of hysteresis loops of up to 1 K confirmed the single-ion-magnet behavior of the cobalt(II) derivative.
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Affiliation(s)
- Ghénadie Novitchi
- Laboratoire National des Champs Magnétiques Intenses, UPR CNRS 3228, Université Grenoble-Alpes , 25 rue des Martyrs, B.P. 166, 38042 Grenoble Cedex 9, France
| | - Shangda Jiang
- Laboratoire National des Champs Magnétiques Intenses, UPR CNRS 3228, Université Grenoble-Alpes , 25 rue des Martyrs, B.P. 166, 38042 Grenoble Cedex 9, France
| | - Sergiu Shova
- "Petru Poni" Institute of Macromolecular Chemistry , Aleea Gr. Ghica Voda 41A, 700487 Iasi, Romania
| | - Fatima Rida
- Laboratoire National des Champs Magnétiques Intenses, UPR CNRS 3228, Université Grenoble-Alpes , 25 rue des Martyrs, B.P. 166, 38042 Grenoble Cedex 9, France
| | - Ivo Hlavička
- Laboratoire National des Champs Magnétiques Intenses, UPR CNRS 3228, Université Grenoble-Alpes , 25 rue des Martyrs, B.P. 166, 38042 Grenoble Cedex 9, France
| | - Milan Orlita
- Laboratoire National des Champs Magnétiques Intenses, UPR CNRS 3228, Université Grenoble-Alpes , 25 rue des Martyrs, B.P. 166, 38042 Grenoble Cedex 9, France
| | - Wolfgang Wernsdorfer
- Institut Néel, UPR CNRS 2940, Université Grenoble-Alpes , B.P. 166, 38042 Grenoble Cedex 9, France.,Physikalisches Institut and Institute of Nanotechnology, Karlsruhe Institute of Technology , Wolfgang-Gaede-Strasse 1, 76131 Karlsruhe, Germany
| | - Rana Hamze
- Laboratoire de Chimie et Physique Quantiques, UMR 5626, Université de Toulouse 3, Paul Sabatier , 118 route de Narbonne, 31062 Toulouse, France
| | - Cyril Martins
- Laboratoire de Chimie et Physique Quantiques, UMR 5626, Université de Toulouse 3, Paul Sabatier , 118 route de Narbonne, 31062 Toulouse, France
| | - Nicolas Suaud
- Laboratoire de Chimie et Physique Quantiques, UMR 5626, Université de Toulouse 3, Paul Sabatier , 118 route de Narbonne, 31062 Toulouse, France
| | - Nathalie Guihéry
- Laboratoire de Chimie et Physique Quantiques, UMR 5626, Université de Toulouse 3, Paul Sabatier , 118 route de Narbonne, 31062 Toulouse, France
| | - Anne-Laure Barra
- Laboratoire National des Champs Magnétiques Intenses, UPR CNRS 3228, Université Grenoble-Alpes , 25 rue des Martyrs, B.P. 166, 38042 Grenoble Cedex 9, France
| | - Cyrille Train
- Laboratoire National des Champs Magnétiques Intenses, UPR CNRS 3228, Université Grenoble-Alpes , 25 rue des Martyrs, B.P. 166, 38042 Grenoble Cedex 9, France
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10
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Ma XF, Wang Z, Chen XL, Kurmoo M, Zeng MH. Ligand Effect on the Single-Molecule Magnetism of Tetranuclear Co(II) Cubane. Inorg Chem 2017; 56:15178-15186. [PMID: 29200286 DOI: 10.1021/acs.inorgchem.7b02530] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiong-Feng Ma
- Key Laboratory for
the Chemistry and Molecular Engineering of Medicinal Resources, School
of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, People’s Republic of China
| | - Zhenxing Wang
- Wuhan National High Magnetic
Field Center, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China
| | - Xue-Li Chen
- Hubei Collaborative Innovation Center for Advanced Organic Chemical
Materials, Ministry of Education Key Laboratory for the Synthesis
and Application of Organic Functional Molecules, College of Chemistry
and Chemical Engineering, Hubei University, Wuhan 430062, People’s Republic of China
| | - Mohamedally Kurmoo
- Institut
de Chimie de Strasbourg, CNRS-UMR7177, Université de Strasbourg, 67070 Strasbourg, France
| | - Ming-Hua Zeng
- Key Laboratory for
the Chemistry and Molecular Engineering of Medicinal Resources, School
of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, People’s Republic of China
- Hubei Collaborative Innovation Center for Advanced Organic Chemical
Materials, Ministry of Education Key Laboratory for the Synthesis
and Application of Organic Functional Molecules, College of Chemistry
and Chemical Engineering, Hubei University, Wuhan 430062, People’s Republic of China
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11
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Lippert KA, Mukherjee C, Broschinski JP, Lippert Y, Walleck S, Stammler A, Bögge H, Schnack J, Glaser T. Suppression of Magnetic Quantum Tunneling in a Chiral Single-Molecule Magnet by Ferromagnetic Interactions. Inorg Chem 2017; 56:15119-15129. [DOI: 10.1021/acs.inorgchem.7b02453] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kai-Alexander Lippert
- Lehrstuhl für
Anorganische Chemie I, Fakultät für Chemie, Universität Bielefeld, Universitätsstrasse 25, D-33615 Bielefeld, Germany
| | - Chandan Mukherjee
- Lehrstuhl für
Anorganische Chemie I, Fakultät für Chemie, Universität Bielefeld, Universitätsstrasse 25, D-33615 Bielefeld, Germany
| | - Jan-Philipp Broschinski
- Lehrstuhl für
Anorganische Chemie I, Fakultät für Chemie, Universität Bielefeld, Universitätsstrasse 25, D-33615 Bielefeld, Germany
| | - Yvonne Lippert
- Lehrstuhl für
Anorganische Chemie I, Fakultät für Chemie, Universität Bielefeld, Universitätsstrasse 25, D-33615 Bielefeld, Germany
| | - Stephan Walleck
- Lehrstuhl für
Anorganische Chemie I, Fakultät für Chemie, Universität Bielefeld, Universitätsstrasse 25, D-33615 Bielefeld, Germany
| | - Anja Stammler
- Lehrstuhl für
Anorganische Chemie I, Fakultät für Chemie, Universität Bielefeld, Universitätsstrasse 25, D-33615 Bielefeld, Germany
| | - Hartmut Bögge
- Lehrstuhl für
Anorganische Chemie I, Fakultät für Chemie, Universität Bielefeld, Universitätsstrasse 25, D-33615 Bielefeld, Germany
| | - Jürgen Schnack
- Fakultät für Physik, Universität Bielefeld, Universitätsstrasse
25, D-33615 Bielefeld, Germany
| | - Thorsten Glaser
- Lehrstuhl für
Anorganische Chemie I, Fakultät für Chemie, Universität Bielefeld, Universitätsstrasse 25, D-33615 Bielefeld, Germany
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12
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Fournet AD, Mitchell KJ, Wernsdorfer W, Abboud KA, Christou G. Three-Dimensional (3-D) Ferromagnetic Network of Mn 12 Single-Molecule Magnets: Subtle Environmental Effects and Switching to Antiferromagnetic. Inorg Chem 2017; 56:10706-10716. [PMID: 28829615 DOI: 10.1021/acs.inorgchem.7b01676] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A new member of the Mn12 family of single-molecule magnets (SMMs) has been prepared and found to be the first of this family to give a 3-D ferromagnetic network. [Mn12O12(O2CC6H4-p-F)16(H2O)4] (2) was prepared by carboxylate substitution on the acetate derivative with p-F-benzoic acid and crystallizes as 2·8MeCN in space group I4̅2m with extensive formation of intermolecular C-H···F hydrogen-bonding. The latter leads to a combination of ferromagnetic (F) and antiferromagnetic (AF) interactions and an overall F network that gives a χMT value at low T that is abnormally high for an S = 10 ground state. 2·8MeCN undergoes solvent loss under vacuum to 2, with a decrease in unit-cell volume of 17%, primarily due to a 13% decrease in the c-axis. The χMT vs T plot for 2 indicates a switch to a net AF network. Exposure to air causes hydration to 2·3H2O, a concomitant increase in unit cell volume, and a switch back to a F network. The same conversion of 2·8MeCN to 2·3H2O can also be accomplished in one step rather than two steps, by leaving crystals of the former exposed to air at ambient temperature and pressure for 10 days, giving the same magnetic plots. Interestingly, the desolvation/solvation processes cause Jahn-Teller isomerism to occur, but the ratio of the faster-relaxing isomer to the normal slowly relaxing one does not change monotonically. Single-crystal micro-SQUID studies on 2·8MeCN show the expected magnetization hysteresis loops for a SMM and a small exchange-bias from the intermolecular interactions that is unexpectedly AF. Since the micro-SQUID study only identifies interactions along the easy-axis (z-axis) of the crystal, this is readily rationalized as due to the Jz components of the intermolecular interactions in 2·8MeCN being net AF. The combined results offer useful insights into the degree of sensitivity of the magnetic properties to small environmental perturbations.
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Affiliation(s)
- Adeline D Fournet
- Department of Chemistry, University of Florida , Gainesville, Florida 32611, United States
| | - Kylie J Mitchell
- Department of Chemistry, University of Florida , Gainesville, Florida 32611, United States
| | - Wolfgang Wernsdorfer
- Institut Néel-CNRS and University Grenoble Alpes , F-38000 Grenoble, Cedex 9, France
| | - Khalil A Abboud
- Department of Chemistry, University of Florida , Gainesville, Florida 32611, United States
| | - George Christou
- Department of Chemistry, University of Florida , Gainesville, Florida 32611, United States
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13
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Londoño-Calderón CL, Moscoso-Londoño O, Muraca D, Arzuza L, Carvalho P, Pirota KR, Knobel M, Pampillo LG, Martínez-García R. Synthesis and magnetic properties of cobalt-iron/cobalt-ferrite soft/hard magnetic core/shell nanowires. NANOTECHNOLOGY 2017; 28:245605. [PMID: 28452330 DOI: 10.1088/1361-6528/aa7010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A straightforward method for the synthesis of CoFe2.7/CoFe2O4 core/shell nanowires is described. The proposed method starts with a conventional pulsed electrodeposition procedure on alumina nanoporous template. The obtained CoFe2.7 nanowires are released from the template and allowed to oxidize at room conditions over several weeks. The effects of partial oxidation on the structural and magnetic properties were studied by x-ray spectrometry, magnetometry, and scanning and transmission electron microscopy. The results indicate that the final nanowires are composed of 5 nm iron-cobalt alloy nanoparticles. Releasing the nanowires at room conditions promoted surface oxidation of the nanoparticles and created a CoFe2O4 shell spinel-like structure. The shell avoids internal oxidation and promotes the formation of bi-magnetic soft/hard magnetic core/shell nanowires. The magnetic properties of both the initial single-phase CoFe2.7 nanowires and the final core/shell nanowires, reveal that the changes in the properties from the array are due to the oxidation more than effects associated with released processes (disorder and agglomeration).
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Affiliation(s)
- César Leandro Londoño-Calderón
- Institute of Polymer Technology and Nanotechnology (ITPN-CONICET), Faculty of Engineering, University of Buenos Aires, CP 1127, Buenos Aires, Argentina
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14
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Chen YC, Liu JL, Wernsdorfer W, Liu D, Chibotaru LF, Chen XM, Tong ML. Hyperfine-Interaction-Driven Suppression of Quantum Tunneling at Zero Field in a Holmium(III) Single-Ion Magnet. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201701480] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yan-Cong Chen
- Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education; School of Chemistry; Sun Yat-Sen University; Guangzhou 510275 P.R. China
| | - Jun-Liang Liu
- Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education; School of Chemistry; Sun Yat-Sen University; Guangzhou 510275 P.R. China
| | - Wolfgang Wernsdorfer
- Institut Néel, CNRS &; Université Joseph Fournier; Grenoble Cedex 9 France
- Institute of Nanotechnology; Karlsruhe Institute of Technology; Germany
- Physikalisches Institut; Karlsruhe Institute of Technology; Germany
| | - Dan Liu
- Theory of Nanomaterials Group and INPAC-Institute of Nanoscale Physics and Chemistry; Katholieke Universiteit Leuven; Belgium
| | - Liviu F. Chibotaru
- Theory of Nanomaterials Group and INPAC-Institute of Nanoscale Physics and Chemistry; Katholieke Universiteit Leuven; Belgium
| | - Xiao-Ming Chen
- Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education; School of Chemistry; Sun Yat-Sen University; Guangzhou 510275 P.R. China
| | - Ming-Liang Tong
- Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education; School of Chemistry; Sun Yat-Sen University; Guangzhou 510275 P.R. China
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15
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Chen YC, Liu JL, Wernsdorfer W, Liu D, Chibotaru LF, Chen XM, Tong ML. Hyperfine-Interaction-Driven Suppression of Quantum Tunneling at Zero Field in a Holmium(III) Single-Ion Magnet. Angew Chem Int Ed Engl 2017; 56:4996-5000. [PMID: 28295930 DOI: 10.1002/anie.201701480] [Citation(s) in RCA: 147] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Indexed: 11/09/2022]
Abstract
An extremely rare non-Kramers holmium(III) single-ion magnet (SIM) is reported to be stabilized in the pentagonal-bipyramidal geometry by a phosphine oxide with a high energy barrier of 237(4) cm-1 . The suppression of the quantum tunneling of magnetization (QTM) at zero field and the hyperfine structures originating from field-induced QTMs can be observed even from the field-dependent alternating-current magnetic susceptibility in addition to single-crystal hysteresis loops. These dramatic dynamics were attributed to the combination of the favorable crystal-field environment and the hyperfine interactions arising from 165 Ho (I=7/2) with a natural abundance of 100 %.
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Affiliation(s)
- Yan-Cong Chen
- Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, P.R. China
| | - Jun-Liang Liu
- Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, P.R. China
| | - Wolfgang Wernsdorfer
- Institut Néel, CNRS &, Université Joseph Fournier, Grenoble Cedex 9, France.,Institute of Nanotechnology, Karlsruhe Institute of Technology, Germany.,Physikalisches Institut, Karlsruhe Institute of Technology, Germany
| | - Dan Liu
- Theory of Nanomaterials Group and INPAC-Institute of Nanoscale Physics and Chemistry, Katholieke Universiteit Leuven, Belgium
| | - Liviu F Chibotaru
- Theory of Nanomaterials Group and INPAC-Institute of Nanoscale Physics and Chemistry, Katholieke Universiteit Leuven, Belgium
| | - Xiao-Ming Chen
- Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, P.R. China
| | - Ming-Liang Tong
- Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, P.R. China
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16
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Novitchi G, Shova S, Lan Y, Wernsdorfer W, Train C. Verdazyl Radical, a Building Block for a Six-Spin-Center 2p–3d–4f Single-Molecule Magnet. Inorg Chem 2016; 55:12122-12125. [DOI: 10.1021/acs.inorgchem.6b02380] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ghénadie Novitchi
- Laboratoire National
des Champs Magnétiques Intenses, UPR CNRS 3228, Université Grenoble-Alpes, B.P. 166, 38042 Grenoble Cedex
9, France
| | - Sergiu Shova
- “Petru Poni” Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41A, 700487 Iasi, Romania
| | - Yanhua Lan
- Institut Néel, UPR CNRS 2940, Université Grenoble-Alpes, B.P. 166, 38042 Grenoble Cedex 9, France
| | - Wolfgang Wernsdorfer
- Institut Néel, UPR CNRS 2940, Université Grenoble-Alpes, B.P. 166, 38042 Grenoble Cedex 9, France
| | - Cyrille Train
- Laboratoire National
des Champs Magnétiques Intenses, UPR CNRS 3228, Université Grenoble-Alpes, B.P. 166, 38042 Grenoble Cedex
9, France
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17
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Martínez-Pérez MJ, Gella D, Müller B, Morosh V, Wölbing R, Sesé J, Kieler O, Kleiner R, Koelle D. Three-Axis Vector Nano Superconducting Quantum Interference Device. ACS NANO 2016; 10:8308-8315. [PMID: 27332709 DOI: 10.1021/acsnano.6b02218] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We present the design, realization, and performance of a three-axis vector nano superconducting quantum interference device (nanoSQUID). It consists of three mutually orthogonal SQUID nanoloops that allow distinguishing the three components of the vector magnetic moment of individual nanoparticles placed at a specific position. The device is based on Nb/HfTi/Nb Josephson junctions and exhibits line widths of ∼250 nm and inner loop areas of 600 × 90 and 500 × 500 nm(2). Operation at temperature T = 4.2 K under external magnetic fields perpendicular to the substrate plane up to ∼50 mT is demonstrated. The experimental flux noise below [Formula: see text] in the white noise limit and the reduced dimensions lead to a total calculated spin sensitivity of [Formula: see text] and [Formula: see text] for the in-plane and out-of-plane components of the vector magnetic moment, respectively. The potential of the device for studying three-dimensional properties of individual nanomagnets is discussed.
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Affiliation(s)
- María José Martínez-Pérez
- Physikalisches Institut-Experimentalphysik II and Center for Quantum Science (CQ) in LISA+, Universität Tübingen , Auf der Morgenstelle 14, D-72076 Tübingen, Germany
| | - Diego Gella
- Physikalisches Institut-Experimentalphysik II and Center for Quantum Science (CQ) in LISA+, Universität Tübingen , Auf der Morgenstelle 14, D-72076 Tübingen, Germany
| | - Benedikt Müller
- Physikalisches Institut-Experimentalphysik II and Center for Quantum Science (CQ) in LISA+, Universität Tübingen , Auf der Morgenstelle 14, D-72076 Tübingen, Germany
| | - Viacheslav Morosh
- Fachbereich Quantenelektronik, Physikalisch-Technische Bundesanstalt , Bundesallee 100, D-38116 Braunschweig, Germany
| | - Roman Wölbing
- Physikalisches Institut-Experimentalphysik II and Center for Quantum Science (CQ) in LISA+, Universität Tübingen , Auf der Morgenstelle 14, D-72076 Tübingen, Germany
| | - Javier Sesé
- Laboratorio de Microscopías Avanzadas (LMA), Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza , E-50018 Zaragoza, Spain
| | - Oliver Kieler
- Fachbereich Quantenelektronik, Physikalisch-Technische Bundesanstalt , Bundesallee 100, D-38116 Braunschweig, Germany
| | - Reinhold Kleiner
- Physikalisches Institut-Experimentalphysik II and Center for Quantum Science (CQ) in LISA+, Universität Tübingen , Auf der Morgenstelle 14, D-72076 Tübingen, Germany
| | - Dieter Koelle
- Physikalisches Institut-Experimentalphysik II and Center for Quantum Science (CQ) in LISA+, Universität Tübingen , Auf der Morgenstelle 14, D-72076 Tübingen, Germany
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18
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Ungur L, Chibotaru LF. Strategies toward High-Temperature Lanthanide-Based Single-Molecule Magnets. Inorg Chem 2016; 55:10043-10056. [PMID: 27508399 DOI: 10.1021/acs.inorgchem.6b01353] [Citation(s) in RCA: 282] [Impact Index Per Article: 35.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Lanthanide-based single-molecule magnets are leading materials for achieving magnetization blocking at the level of one molecule. In this paper, we examine the physical requirements for efficient magnetization blocking in single-ion complexes and identify the design principles for achieving very high magnetization blocking barriers in lanthanide-based compounds. The key condition is the preponderant covalent binding of the Ln ion to one of the ligand atoms, tremendously enhancing the axial crystal field. We also make an overview of practical schemes for the implementation of this principle. These are (1) the effective lowering of the coordination number via displacement of the Ln ion to one of the atoms in the coordination polyhedron, (2) the design of two-coordinated complexes, and (3) the stabilization of diatomic compounds in cages and on surfaces. The last proposal is appealing in connection to spintronics applications, especially via the exploration of robust and highly anisotropic [LnX] units displaying multilevel blocking barriers of thousands of Kelvin and prospects for room-temperature magnetization blocking.
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Affiliation(s)
- Liviu Ungur
- Theory of Nanomaterials Group, Chemistry Department, Katholieke Universiteit Leuven , Celestijnenlaan 200F, 3001 Leuven, Belgium.,Chemistry Department, Lund University , Getingevagen 60, 22201 Lund, Sweden
| | - Liviu F Chibotaru
- Theory of Nanomaterials Group, Chemistry Department, Katholieke Universiteit Leuven , Celestijnenlaan 200F, 3001 Leuven, Belgium
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19
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Salomon W, Lan Y, Rivière E, Yang S, Roch-Marchal C, Dolbecq A, Simonnet-Jégat C, Steunou N, Leclerc-Laronze N, Ruhlmann L, Mallah T, Wernsdorfer W, Mialane P. Single-Molecule Magnet Behavior of Individual Polyoxometalate Molecules Incorporated within Biopolymer or Metal-Organic Framework Matrices. Chemistry 2016; 22:6564-74. [PMID: 27080557 DOI: 10.1002/chem.201600202] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Indexed: 01/05/2023]
Abstract
The chemically and structurally highly stable polyoxometalate (POM) single-molecule magnet (SMM) [(FeW9 O34 )2 Fe4 (H2 O)2 ](10-) (Fe6 W18 ) has been incorporated by direct or post-synthetic approaches into a biopolymer gelatin (Gel) matrix and two crystalline metal-organic frameworks (MOFs), including one diamagnetic (UiO-67) and one magnetic (MIL-101(Cr)). Integrity of the POM in the Fe6 W18 @Gel, Fe6 W18 @UiO-67 and Fe6 W18 @MIL-101(Cr) composites was confirmed by a set of complementary techniques. Magnetic studies indicate that the POMs are magnetically well isolated. Remarkably, in Fe6 W18 @Gel, the SMM properties of the embedded molecules are close to those of the crystals, with clear quantum tunneling steps in the hysteresis loops. For the Fe6 W18 @UiO-67 composite, the molecules retain their SMM properties, the energy barrier being slightly reduced in comparison to the crystalline material and the molecules exhibiting a tunneling rate of magnetization significantly faster than for Fe6 W18 @Gel. When Fe6 W18 is introduced into MIL-101(Cr), the width of the hysteresis loops is drastically reduced and the quantum tunneling steps are smeared out because of the magnetic interactions between the antiferromagnetic matrix and the SMM guest molecules.
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Affiliation(s)
- William Salomon
- Institut Lavoisier de Versailles, UMR CNRS 8180, Université Paris Saclay, Université de Versailles St-Quentin en Yvelines, 45 Avenue des Etats-Unis, 78035, Versailles cedex, France
| | - Yanhua Lan
- CNRS and Université Grenoble Alpes, Institut Néel, 38042, Grenoble, France
| | - Eric Rivière
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, UMR 8182 CNRS, Université Paris Saclay, Université Paris Sud 11, 91405, Orsay cedex, France
| | - Shu Yang
- Université de Strasbourg, Institut de Chimie, UMR CNRS 7177, Laboratoire d'Electrochimie et de Chimie Physique du Corps Solide, 4 Rue Blaise Pascal, CS 90032, 67081, Strasbourg cedex, France
| | - Catherine Roch-Marchal
- Institut Lavoisier de Versailles, UMR CNRS 8180, Université Paris Saclay, Université de Versailles St-Quentin en Yvelines, 45 Avenue des Etats-Unis, 78035, Versailles cedex, France
| | - Anne Dolbecq
- Institut Lavoisier de Versailles, UMR CNRS 8180, Université Paris Saclay, Université de Versailles St-Quentin en Yvelines, 45 Avenue des Etats-Unis, 78035, Versailles cedex, France
| | - Corine Simonnet-Jégat
- Institut Lavoisier de Versailles, UMR CNRS 8180, Université Paris Saclay, Université de Versailles St-Quentin en Yvelines, 45 Avenue des Etats-Unis, 78035, Versailles cedex, France
| | - Nathalie Steunou
- Institut Lavoisier de Versailles, UMR CNRS 8180, Université Paris Saclay, Université de Versailles St-Quentin en Yvelines, 45 Avenue des Etats-Unis, 78035, Versailles cedex, France
| | - Nathalie Leclerc-Laronze
- Institut Lavoisier de Versailles, UMR CNRS 8180, Université Paris Saclay, Université de Versailles St-Quentin en Yvelines, 45 Avenue des Etats-Unis, 78035, Versailles cedex, France
| | - Laurent Ruhlmann
- Université de Strasbourg, Institut de Chimie, UMR CNRS 7177, Laboratoire d'Electrochimie et de Chimie Physique du Corps Solide, 4 Rue Blaise Pascal, CS 90032, 67081, Strasbourg cedex, France
| | - Talal Mallah
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, UMR 8182 CNRS, Université Paris Saclay, Université Paris Sud 11, 91405, Orsay cedex, France.
| | | | - Pierre Mialane
- Institut Lavoisier de Versailles, UMR CNRS 8180, Université Paris Saclay, Université de Versailles St-Quentin en Yvelines, 45 Avenue des Etats-Unis, 78035, Versailles cedex, France.
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20
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Vinslava A, Tasiopoulos AJ, Wernsdorfer W, Abboud KA, Christou G. Molecules at the Quantum-Classical Nanoparticle Interface: Giant Mn70 Single-Molecule Magnets of ∼4 nm Diameter. Inorg Chem 2016; 55:3419-30. [PMID: 26859234 DOI: 10.1021/acs.inorgchem.5b02790] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Two Mn70 torus-like molecules have been obtained from the alcoholysis in EtOH and 2-ClC2H4OH of [Mn12O12(O2CMe)16(H2O)4]·4H2O·2MeCO2H (1) in the presence of NBu(n)4MnO4 and an excess of MeCO2H. The reaction in EtOH afforded [Mn70O60(O2CMe)70(OEt)20(EtOH)16(H2O)22] (2), whereas the reaction in ClC2H4OH gave [Mn70O60(O2CMe)70(OC2H4Cl)20(ClC2H4OH)18(H2O)22] (3). The complexes are nearly isostructural, each possessing a Mn70 torus structure consisting of alternating near-linear [Mn3(μ3-O)4] and cubic [Mn4(μ3-O)2(μ3-OR)2] (R = OEt, 2; R = OC2H4Cl, 3) subunits, linked together via syn,syn-μ-bridging MeCO2(-) and μ3-bridging O(2-) groups. 2 and 3 have an overall diameter of ∼4 nm and crystallize as highly ordered supramolecular nanotubes. Alternating current (ac) magnetic susceptibility measurements, performed on microcrystalline samples in the 1.8-10 K range and a 3.5 G ac field with oscillation frequencies in the 5-1500 Hz range, revealed frequency-dependent out-of-phase signals below ∼2.4 K for both molecules indicative of the slow magnetization relaxation of single-molecule magnets (SMMs). Single-crystal, magnetization vs field studies on both complexes revealed hysteresis loops below 1.5 K, thus confirming 2 and 3 to be new SMMs. The hysteresis loops do not show the steps that are characteristic of quantum tunneling of magnetization (QTM). However, low-temperature studies revealed temperature-independent relaxation rates below ∼0.2 K for both compounds, the signature of ground state QTM. Fitting of relaxation data to the Arrhenius equation gave effective barriers for magnetization reversal (Ueff) of 23 and 18 K for 2 and 3, respectively. Because the Mn70 molecule is close to the classical limit, it was also studied using a method based on the Néel-Brown model of thermally activated magnetization reversal in a classical single-domain magnetic nanoparticle. The field and sweep-rate dependence of the coercive field was investigated and yielded the energy barrier, the spin, the Arrhenius pre-exponential, and the cross-over temperature from the classical to the quantum regime. The validity of this approach emphasizes that large SMMs can be considered as being at or near the quantum-classical nanoparticle interface.
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Affiliation(s)
- Alina Vinslava
- Department of Chemistry, University of Florida , Gainesville, Florida 32611, United States
| | | | - Wolfgang Wernsdorfer
- Institut Néel-CNRS and University Grenoble Alpes , F-38000 Grenoble, Cedex 9, France
| | - Khalil A Abboud
- Department of Chemistry, University of Florida , Gainesville, Florida 32611, United States
| | - George Christou
- Department of Chemistry, University of Florida , Gainesville, Florida 32611, United States
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21
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Beeck T, Baev I, Gieschen S, Meyer H, Meyer S, Palutke S, Feulner P, Uhlig K, Martins M, Wurth W. New experimental perspectives for soft x-ray absorption spectroscopies at ultra-low temperatures below 50 mK and in high magnetic fields up to 7 T. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:045116. [PMID: 27131716 DOI: 10.1063/1.4947516] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A new ultra-low temperature experiment including a superconducting vector magnet has been developed for soft x-ray absorption spectroscopy experiments at third generation synchrotron light sources. The sample is cooled below 50 mK by a cryogen free (3)He-(4)He dilution refrigerator. At the same time, magnetic fields of up to ±7 T in the horizontal direction and ±0.5 T in the vertical direction can be applied by a superconducting vector magnet. The setup allows to study ex situ and in situ prepared samples, offered by an attached UHV preparation chamber with load lock. The transfer of the prepared samples between the preparation section and the dilution refrigerator is carried out under cryogenic temperatures. First commissioning studies have been carried out at the Variable Polarization XUV Beamline P04 at PETRA III and the influence of the incident photon beam to the sample temperature has been studied.
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Affiliation(s)
- T Beeck
- Physics Department, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - I Baev
- Physics Department, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - S Gieschen
- Physics Department, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - H Meyer
- Physics Department, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - S Meyer
- Physics Department, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - S Palutke
- Physics Department, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - P Feulner
- Physik-Department E20, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - K Uhlig
- Walther-Meißner-Institute, Walther-Meißner-Straße 8, 85748 Garching, Germany
| | - M Martins
- Physics Department, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - W Wurth
- Physics Department and Center for Free-Electron Laser Science, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
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22
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Ridier K, Gillon B, Gukasov A, Chaboussant G, Cousson A, Luneau D, Borta A, Jacquot JF, Checa R, Chiba Y, Sakiyama H, Mikuriya M. Polarized Neutron Diffraction as a Tool for Mapping Molecular Magnetic Anisotropy: Local Susceptibility Tensors in CoII
Complexes. Chemistry 2015; 22:724-35. [DOI: 10.1002/chem.201503400] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Indexed: 11/09/2022]
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23
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Feldscher B, Stammler A, Bögge H, Glaser T. Aromatic Versus Heteroradialene Character in Extended Thiophloroglucinol Ligands and their Trinuclear Nickel(II) Complexes. Chem Asian J 2014; 9:2205-18. [DOI: 10.1002/asia.201402272] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Indexed: 11/11/2022]
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24
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Das S, Hossain S, Dey A, Biswas S, Pardo E, Lloret F, Chandrasekhar V. Heterometallic Pentanuclear [Ni
4
Ln] (Ln
III
= Gd, Tb, Dy, Ho) Complexes: Accidental Orthogonality Leading to Ferromagnetic Interactions. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402195] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Sourav Das
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India, http://www.iitk.ac.in
| | - Sakiat Hossain
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India, http://www.iitk.ac.in
| | - Atanu Dey
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India, http://www.iitk.ac.in
- National Institute of Science Education and Research, Institute of Physics Campus, Sachivalaya Marg, P. O. Sainik School, Bhubaneswar 751005, India http://www.niser.ac.in
| | - Sourav Biswas
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India, http://www.iitk.ac.in
| | - Emilio Pardo
- Departament de Química Inorgànica, Instituto de Ciencia Molecular (ICMOL), Universitat de València, 46980 Paterna, València, Spain, http://www.icmol.es
| | - Francesc Lloret
- Departament de Química Inorgànica, Instituto de Ciencia Molecular (ICMOL), Universitat de València, 46980 Paterna, València, Spain, http://www.icmol.es
| | - Vadapalli Chandrasekhar
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India, http://www.iitk.ac.in
- National Institute of Science Education and Research, Institute of Physics Campus, Sachivalaya Marg, P. O. Sainik School, Bhubaneswar 751005, India http://www.niser.ac.in
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25
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Chibotaru LF. Theoretical Understanding of Anisotropy in Molecular Nanomagnets. MOLECULAR NANOMAGNETS AND RELATED PHENOMENA 2014. [DOI: 10.1007/430_2014_171] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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26
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Pham L, Abboud KA, Wernsdorfer W, Christou G. Synthesis, structure and magnetic properties of [FeIII4LnIII2] (Ln=Gd, Tb, Dy, Ho) and [FeIII4YIII2] clusters. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.04.024] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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27
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Chandrasekhar V, Das S, Dey A, Hossain S, Kundu S, Colacio E. Linear, Edge-Sharing Heterometallic Trinuclear [CoII-LnIII-CoII] (LnIII= GdIII, DyIII, TbIII, and HoIII) Complexes: Slow Relaxation of Magnetization in the DyIIIDerivative. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201301171] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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28
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29
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Alexandropoulos DI, Mazarakioti EC, Teat SJ, Stamatatos TC. Rare nuclearities, new structural motifs, and slow magnetization relaxation phenomena in manganese cluster chemistry: A Mn15Na2 cage from the use of triethanolamine/pivalate/azide “blend”. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.02.055] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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30
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Biswas R, Ida Y, Baker ML, Biswas S, Kar P, Nojiri H, Ishida T, Ghosh A. A New Family of Trinuclear Nickel(II) Complexes as Single-Molecule Magnets. Chemistry 2013; 19:3943-53. [DOI: 10.1002/chem.201202795] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2012] [Revised: 11/08/2012] [Indexed: 11/09/2022]
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31
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Hameury S, Kayser L, Pattacini R, Rogez G, Wernsdorfer W, Braunstein P. Synthesis of cubane-type Ni(ii) complexes from pyridyl-alcohol ligands; their single-molecule magnet behaviour. Dalton Trans 2013; 42:5013-24. [DOI: 10.1039/c3dt32869d] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Siddiqi ZA, Siddique A, Shahid M, Khalid M, Sharma PK, Anjuli, Ahmad M, Kumar S, Lan Y, Powell AK. Synthesis, crystal structure and magnetic studies of tetranuclear hydroxo and ligand bridged [Co4(μ3-OH)2(μ2-dea)2(L–L)4]4Cl·8H2O [L–L = 2,2′-bipyridine or 1,10-phenanthroline] complexes with mixed valence defect dicubane core. Dalton Trans 2013; 42:9513-22. [DOI: 10.1039/c3dt50854d] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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33
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Fang M, Zhao H, Prosvirin AV, Pinkowicz D, Zhao B, Cheng P, Wernsdorfer W, Brechin EK, Dunbar KR. Squaring the cube: a family of octametallic lanthanide complexes including a Dy8 single-molecule magnet. Dalton Trans 2013; 42:14693-701. [DOI: 10.1039/c3dt51727f] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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34
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Mereacre V, Lan Y, Wernsdorfer W, Anson CE, Powell AK. A family of dodecanuclear Mn11Ln single-molecule magnets. CR CHIM 2012. [DOI: 10.1016/j.crci.2012.05.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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35
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Ouazi S, Wedekind S, Rodary G, Oka H, Sander D, Kirschner J. Magnetization reversal of individual Co nanoislands. PHYSICAL REVIEW LETTERS 2012; 108:107206. [PMID: 22463452 DOI: 10.1103/physrevlett.108.107206] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2011] [Indexed: 05/31/2023]
Abstract
We investigate the magnetization reversal of individual Co islands on Cu(111) in the size range of N=700 to 18,000 atoms by spin-polarized scanning tunneling microscopy at 8 K. The switching field H(sw) changes with island size in a nonmonotonic manner: it increases with island size and reaches a maximum value of 2.4 T at N=5500 atoms, and it decreases for larger islands. We extract the energy barrier for magnetization reversal as a function of island size. The maximum H(sw) corresponds to an energy barrier of 1 eV. Our results elucidate a crossover of the magnetization reversal from an exchange-spring behavior to domain wall formation with increasing size at around 7500 atoms.
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Affiliation(s)
- S Ouazi
- Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle/Saale, Germany
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36
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El Moll H, Dolbecq A, Marrot J, Rousseau G, Haouas M, Taulelle F, Rogez G, Wernsdorfer W, Keita B, Mialane P. A Stable Hybrid Bisphosphonate Polyoxometalate Single-Molecule Magnet. Chemistry 2012; 18:3845-9. [DOI: 10.1002/chem.201200140] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Indexed: 11/12/2022]
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37
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Miyasaka H, Madanbashi T, Saitoh A, Motokawa N, Ishikawa R, Yamashita M, Bahr S, Wernsdorfer W, Clérac R. Cyano-Bridged MnIIIMIII Single-Chain Magnets with MIII=CoIII, FeIII, MnIII, and CrIII. Chemistry 2012; 18:3942-54. [DOI: 10.1002/chem.201102738] [Citation(s) in RCA: 114] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Indexed: 11/11/2022]
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38
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Charalambous M, Moushi EE, Papatriantafyllopoulou C, Wernsdorfer W, Nastopoulos V, Christou G, Tasiopoulos AJ. A Mn36Ni4 ‘loop-of-loops-and-supertetrahedra’ aggregate possessing a high ST = 26 ± 1 spin ground state. Chem Commun (Camb) 2012; 48:5410-2. [DOI: 10.1039/c2cc30654a] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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Katoh K, Horii Y, Yasuda N, Wernsdorfer W, Toriumi K, Breedlove BK, Yamashita M. Multiple-decker phthalocyaninato dinuclear lanthanoid(iii) single-molecule magnets with dual-magnetic relaxation processes. Dalton Trans 2012; 41:13582-600. [DOI: 10.1039/c2dt31400b] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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40
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Wang YX, Shi W, Li H, Song Y, Fang L, Lan Y, Powell AK, Wernsdorfer W, Ungur L, Chibotaru LF, Shen M, Cheng P. A single-molecule magnet assembly exhibiting a dielectric transition at 470 K. Chem Sci 2012. [DOI: 10.1039/c2sc21023a] [Citation(s) in RCA: 147] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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41
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Zhou CL, Wang ZM, Wang BW, Gao S. A oximato-bridged linear trinuclear [MnIVMnIIIMnIV] single-molecule magnet. Dalton Trans 2012; 41:13620-5. [DOI: 10.1039/c2dt31039b] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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42
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Tanasa R, Stancu A. Deterministic and non-deterministic switching in chains of magnetic hysterons. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:426002. [PMID: 21969255 DOI: 10.1088/0953-8984/23/42/426002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
This paper presents a fundamental analysis of a single-domain ferromagnetic particles chain hysteresis in perpendicular geometry as a prototype for ultra-high density memories. Due to magnetostatic long range interactions the system has a complex hysteresis but stable features can be found. The loop has a number of deterministic Barkhausen jumps and consequently a number of stable plateaus that could be used in multistate memories. The fundamental elements that sustain this behavior are shown and discussed.
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Affiliation(s)
- R Tanasa
- Faculty of Physics, Department of Physics, Alexandru Ioan Cuza University, Iasi, Boulevard Carol I, no. 11, R-700506 Romania.
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43
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Hołyńska M, Premužić D, Jeon IR, Wernsdorfer W, Clérac R, Dehnen S. [MnIII6O3Ln2] Single-Molecule Magnets: Increasing the Energy Barrier Above 100 K. Chemistry 2011; 17:9605-10. [DOI: 10.1002/chem.201101807] [Citation(s) in RCA: 111] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2011] [Indexed: 11/10/2022]
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44
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Shit A, Chattopadhyay S, Ray Chaudhuri J. Towards an understanding of escape rate and state dependent diffusion for a quantum dissipative system. Chem Phys 2011. [DOI: 10.1016/j.chemphys.2011.06.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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45
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Castelli L, Fittipaldi M, Powell AK, Gatteschi D, Sorace L. Single crystal EPR study at 95 GHz of a large Fe based molecular nanomagnet: toward the structuring of magnetic nanoparticle properties. Dalton Trans 2011; 40:8145-55. [PMID: 21637875 DOI: 10.1039/c1dt10311c] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A W-band single-crystal EPR study has been performed on a molecular cluster comprising 19 iron(III) ions bridged by oxo- hydroxide ions, Fe(19), in order to investigate magnetic nanosystems with a behavior in between the one of Magnetic NanoParticles (MNP) and that of Single Molecule Magnets (SMM). The Fe(19) has a disk-like shape: a planar Fe(7) core with a brucite (Mg(OH)(2)) structure enclosed in a "shell" of 12 Fe(III) ions. EPR and magnetic measurements revealed an S = 35/2 ground state with an S = 33/2 excited state lying ∼ 8 K above. The presence of other low-lying excited states was also envisaged. Rhombic Zero Field Splitting (ZFS) tensors were determined, the easy axes lying in the Fe(19) plane for both the multiplets. At particular temperatures and orientations, a partially resolved fine structure could be observed which could not be distinguished in powder spectra, due to orientation disorder. The similarities of the EPR behavior of Fe(19) and MNP, together with the accuracy of single crystal analysis, helped to shed light on spectral features observed in MNP spectra, that is a sharp line at g = 2 and a low intensity transition at g = 4. Moreover, a theoretical analysis has been used to estimate the contribution to the total magnetic anisotropy of core and surface; this latter is crucial in determining the easy axis-type anisotropy, alike that of MNP surface.
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Affiliation(s)
- L Castelli
- Dipartimento di Chimica U. Schiff and UdR INSTM, Università di Firenze, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy
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46
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Taylor SM, Karotsis G, McIntosh RD, Kennedy S, Teat SJ, Beavers CM, Wernsdorfer W, Piligkos S, Dalgarno SJ, Brechin EK. A Family of Calix[4]arene-Supported [MnIII2MnII2] Clusters. Chemistry 2011; 17:7521-30. [DOI: 10.1002/chem.201003327] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2010] [Revised: 03/10/2011] [Indexed: 11/07/2022]
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47
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Manoli M, Inglis R, Manos MJ, Nastopoulos V, Wernsdorfer W, Brechin EK, Tasiopoulos AJ. A [Mn32] Double-Decker Wheel. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201100976] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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48
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49
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Borta A, Jeanneau E, Chumakov Y, Luneau D, Ungur L, Chibotaru LF, Wernsdorfer W. Synthesis, structure, magnetism and theoretical study of a series of complexes with a decanuclear core [Ln(iii)2Cu(ii)8] (Ln = Y, Gd, Tb, Dy). NEW J CHEM 2011. [DOI: 10.1039/c0nj00931h] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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50
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Inglis R, White F, Piligkos S, Wernsdorfer W, Brechin EK, Papaefstathiou GS. Chiral single-molecule magnets: a partial Mn(iii) supertetrahedron from achiral components. Chem Commun (Camb) 2011; 47:3090-2. [DOI: 10.1039/c0cc05750a] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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