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Evolution of interlayer and intralayer magnetism in three atomically thin chromium trihalides.


ABSTRACT: We conduct a comprehensive study of three different magnetic semiconductors, CrI3, CrBr3, and CrCl3, by incorporating both few-layer and bilayer samples in van der Waals tunnel junctions. We find that the interlayer magnetic ordering, exchange gap, magnetic anisotropy, and magnon excitations evolve systematically with changing halogen atom. By fitting to a spin wave theory that accounts for nearest-neighbor exchange interactions, we are able to further determine a simple spin Hamiltonian describing all three systems. These results extend the 2D magnetism platform to Ising, Heisenberg, and XY spin classes in a single material family. Using magneto-optical measurements, we additionally demonstrate that ferromagnetism can be stabilized down to monolayer in more isotropic CrBr3, with transition temperature still close to that of the bulk.

SUBMITTER: Kim HH 

PROVIDER: S-EPMC6561243 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature

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Evolution of interlayer and intralayer magnetism in three atomically thin chromium trihalides.

Kim Hyun Ho HH   Yang Bowen B   Li Siwen S   Jiang Shengwei S   Jin Chenhao C   Tao Zui Z   Nichols George G   Sfigakis Francois F   Zhong Shazhou S   Li Chenghe C   Tian Shangjie S   Cory David G DG   Miao Guo-Xing GX   Shan Jie J   Mak Kin Fai KF   Lei Hechang H   Sun Kai K   Zhao Liuyan L   Tsen Adam W AW  

Proceedings of the National Academy of Sciences of the United States of America 20190520 23


We conduct a comprehensive study of three different magnetic semiconductors, CrI<sub>3</sub>, CrBr<sub>3</sub>, and CrCl<sub>3</sub>, by incorporating both few-layer and bilayer samples in van der Waals tunnel junctions. We find that the interlayer magnetic ordering, exchange gap, magnetic anisotropy, and magnon excitations evolve systematically with changing halogen atom. By fitting to a spin wave theory that accounts for nearest-neighbor exchange interactions, we are able to further determine  ...[more]

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