| Literature DB >> 31110023 |
Hyun Ho Kim1,2, Bowen Yang1,3, Siwen Li4, Shengwei Jiang5,6,7, Chenhao Jin5,6,7, Zui Tao5,6,7, George Nichols1,3, Francois Sfigakis1,2, Shazhou Zhong1,3, Chenghe Li8,9, Shangjie Tian8,9, David G Cory1,2, Guo-Xing Miao1,10, Jie Shan5,6,7, Kin Fai Mak5,6,7, Hechang Lei8,9, Kai Sun4, Liuyan Zhao4, Adam W Tsen11,2.
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.Entities:
Keywords: 2D magnetism; chromium trihalides; tunneling spectroscopy
Year: 2019 PMID： 31110023 PMCID： PMC6561243 DOI： 10.1073/pnas.1902100116
Source DB: PubMed Journal: Proc Natl Acad Sci U S A ISSN： 0027-8424 Impact factor: 11.205