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Bikaljević D, González-Orellana C, Peña-Díaz M, Steiner D, Dreiser J, Gargiani P, Foerster M, Niño MÁ, Aballe L, Ruiz-Gomez S, Friedrich N, Hieulle J, Jingcheng L, Ilyn M, Rogero C, Pascual JI. Noncollinear Magnetic Order in Two-Dimensional NiBr 2 Films Grown on Au(111). ACS NANO 2021; 15:14985-14995. [PMID: 34491033 PMCID: PMC8482757 DOI: 10.1021/acsnano.1c05221] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Indexed: 05/12/2023]
Abstract
Metal halides are a class of layered materials with promising electronic and magnetic properties persisting down to the two-dimensional limit. While most recent studies focused on the trihalide components of this family, the rather unexplored metal dihalides are also van der Waals layered systems with distinctive magnetic properties. Here we show that the dihalide NiBr2 grows epitaxially on a Au(111) substrate and exhibits semiconducting and magnetic behavior starting from a single layer. Through a combination of a low-temperature scanning-tunneling microscopy, low-energy electron diffraction, X-ray photoelectron spectroscopy, and photoemission electron microscopy, we identify two competing layer structures of NiBr2 coexisting at the interface and a stoichiometrically pure layer-by-layer growth beyond. Interestingly, X-ray absorption spectroscopy measurements revealed a magnetically ordered state below 27 K with in-plane magnetic anisotropy and zero-remanence in the single layer of NiBr2/Au(111), which we attribute to a noncollinear magnetic structure. The combination of such two-dimensional magnetic order with the semiconducting behavior down to the 2D limit offers the attractive perspective of using these films as ultrathin crystalline barriers in tunneling junctions and low-dimensional devices.
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Affiliation(s)
- Djuro Bikaljević
- CIC
nanoGUNE-BRTA, 20018 Donostia-San Sebastián, Spain
- Institute
of Physical Chemistry, University of Innsbruck, Innrain 52c, A-6020 Innsbruck, Austria
| | | | - Marina Peña-Díaz
- Centro
de Física de Materiales (CSIC/UPV-EHU), 20018 Donostia-San
Sebastián, Spain
| | - Dominik Steiner
- Institute
of Physical Chemistry, University of Innsbruck, Innrain 52c, A-6020 Innsbruck, Austria
| | - Jan Dreiser
- Paul
Scherrer Institut, Forschungsstrasse
111, CH-5232 Villigen, PSI, Switzerland
| | - Pierluigi Gargiani
- ALBA
Synchrotron Light Source, Carrer de la Llum, 2-26, 08290 Barcelona, Spain
| | - Michael Foerster
- ALBA
Synchrotron Light Source, Carrer de la Llum, 2-26, 08290 Barcelona, Spain
| | - Miguel Ángel Niño
- ALBA
Synchrotron Light Source, Carrer de la Llum, 2-26, 08290 Barcelona, Spain
| | - Lucía Aballe
- ALBA
Synchrotron Light Source, Carrer de la Llum, 2-26, 08290 Barcelona, Spain
| | - Sandra Ruiz-Gomez
- ALBA
Synchrotron Light Source, Carrer de la Llum, 2-26, 08290 Barcelona, Spain
| | | | | | - Li Jingcheng
- CIC
nanoGUNE-BRTA, 20018 Donostia-San Sebastián, Spain
| | - Maxim Ilyn
- Centro
de Física de Materiales (CSIC/UPV-EHU), 20018 Donostia-San
Sebastián, Spain
| | - Celia Rogero
- Centro
de Física de Materiales (CSIC/UPV-EHU), 20018 Donostia-San
Sebastián, Spain
- Donostia
International Physics Center DIPC, 20018 Donostia-San Sebastián, Spain
| | - José Ignacio Pascual
- CIC
nanoGUNE-BRTA, 20018 Donostia-San Sebastián, Spain
- Ikerbasque,
Basque Foundation for Science, 48013 Bilbao, Spain
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Prayitno TB. Controlling phase transition in monolayer metal diiodides XI 2(X: Fe, Co, and Ni) by carrier doping. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:335803. [PMID: 34102631 DOI: 10.1088/1361-648x/ac0937] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 06/08/2021] [Indexed: 06/12/2023]
Abstract
We applied the generalized Bloch theorem to verify the ground state (most stable state) in monolayer metal diiodides 1T-XI2(X: Fe, Co, and Ni), a family of metal dihalides, using the first-principles calculations. The ground state, which can be ferromagnetic, antiferromagnetic, or spiral state, was specified by a wavevector in the primitive unit cell. While the ground state of FeI2is ferromagnetic, the spiral state becomes the ground state for CoI2and NiI2. Since the multiferroic behavior in the metal dihalide can be preserved by the spiral structure, we believe that CoI2and NiI2are promising multiferroic materials in the most stable state. When the lattice parameter increases, we also show that the ground state of NiI2changes to a ferromagnetic state while others still keep their initial ground states. For the last discussion, we revealed the phase transition manipulated by the hole-electron doping due to the spin-spin competition between the ferromagnetic superexchange and the antiferromagnetic direct exchange. These results convince us that metal diiodides have many benefits for future spintronic devices.
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Affiliation(s)
- Teguh Budi Prayitno
- Department of Physics, Faculty of Mathematics and Natural Science, Universitas Negeri Jakarta, Kampus A Jl. Rawamangun Muka, Jakarta Timur 13220, Indonesia
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Bergeron H, Lebedev D, Hersam MC. Polymorphism in Post-Dichalcogenide Two-Dimensional Materials. Chem Rev 2021; 121:2713-2775. [PMID: 33555868 DOI: 10.1021/acs.chemrev.0c00933] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Two-dimensional (2D) materials exhibit a wide range of atomic structures, compositions, and associated versatility of properties. Furthermore, for a given composition, a variety of different crystal structures (i.e., polymorphs) can be observed. Polymorphism in 2D materials presents a fertile landscape for designing novel architectures and imparting new functionalities. The objective of this Review is to identify the polymorphs of emerging 2D materials, describe their polymorph-dependent properties, and outline methods used for polymorph control. Since traditional 2D materials (e.g., graphene, hexagonal boron nitride, and transition metal dichalcogenides) have already been studied extensively, the focus here is on polymorphism in post-dichalcogenide 2D materials including group III, IV, and V elemental 2D materials, layered group III, IV, and V metal chalcogenides, and 2D transition metal halides. In addition to providing a comprehensive survey of recent experimental and theoretical literature, this Review identifies the most promising opportunities for future research including how 2D polymorph engineering can provide a pathway to materials by design.
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Affiliation(s)
- Hadallia Bergeron
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Dmitry Lebedev
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Mark C Hersam
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States.,Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States.,Department of Electrical and Computer Engineering, Northwestern University, Evanston, Illinois 60208, United States
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Alekseev AY, Chernykh AG, Filonov AB, Migas DB, Skorodumova NV. Stability of 2D Alkaline-Earth Metal Silicides, Germanides and Stannides. INTERNATIONAL JOURNAL OF NANOSCIENCE 2019. [DOI: 10.1142/s0219581x19400131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
By means of ab initio calculations, we have estimated stability of 2D Me[Formula: see text] ([Formula: see text], Ca, Sr, Ba and [Formula: see text], Ge, Sn) in the T and Td phases, which are similar to the ones of 2D transition metal chalcogenides, in addition to their phonon spectra. The T phase is found to be more stable for 2D Ca[Formula: see text], Sr[Formula: see text] and Ba[Formula: see text], whereas the Td phase is predicted to be the ground state for 2D Mg[Formula: see text]. We have also discussed that imaginary frequencies in the calculated phonon spectra of 2D Me[Formula: see text], which appeared in the vicinity of the [Formula: see text] point, were not necessarily associated with the dynamic instability.
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Affiliation(s)
- A. Yu. Alekseev
- Belarusian State University of Informatics and Radioelectronics, P. Browka 6, 220013 Minsk, Belarus
| | - A. G. Chernykh
- Belarusian State University of Informatics and Radioelectronics, P. Browka 6, 220013 Minsk, Belarus
| | - A. B. Filonov
- Belarusian State University of Informatics and Radioelectronics, P. Browka 6, 220013 Minsk, Belarus
| | - D. B. Migas
- Belarusian State University of Informatics and Radioelectronics, P. Browka 6, 220013 Minsk, Belarus
- National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe shosse 31, 115409 Moscow, Russia
| | - N. V. Skorodumova
- Multiscale Materials Modelling, Department of Materials and Engineering, Royal Institute of Technology (KTH), SE-10044 Stockholm, Sweden
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-75121 Uppsala, Sweden
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Wu X, Han J, Feng Y, Li G, Wang C, Ding G, Gao G. Half-metals and half-semiconductors in a transition metal doped SnSe2 monolayer: a first-principles study. RSC Adv 2017. [DOI: 10.1039/c7ra07648g] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Recently, a new two-dimensional (2D) semiconductor SnSe2 monolayer has been grown by molecular beam epitaxy, and weak ferromagnetic behavior above room temperature in Mn-doped SnSe2 thin films was also observed experimentally.
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Affiliation(s)
- Xuming Wu
- School of Physics and Wuhan National High Magnetic Field Center
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Jiangchao Han
- School of Physics and Wuhan National High Magnetic Field Center
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Yulin Feng
- School of Physics and Wuhan National High Magnetic Field Center
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Guanpeng Li
- School of Physics and Wuhan National High Magnetic Field Center
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Cong Wang
- School of Physics and Wuhan National High Magnetic Field Center
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Guangqian Ding
- School of Science
- Chongqing University of Posts and Telecommunications
- Chongqing
- China
| | - Guoying Gao
- School of Physics and Wuhan National High Magnetic Field Center
- Huazhong University of Science and Technology
- Wuhan 430074
- China
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