期刊
NANO LETTERS
卷 20, 期 1, 页码 553-558出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b04282
关键词
Magnetic force microscopy; 2D magnets; CrI3; magnetic orders; magnetization switching
类别
资金
- Regents of the University of California
- DOE BES Grant [DE-FG02-07ER46351]
- Natural Science Foundation of China [51725203, 51721001, U1932115]
- Elemental Strategy Initiative by the MEXT, Japan
- CREST, JST [JPMJCR15F3]
The magnetic properties in two-dimensional van der Waals materials depend sensitively on structure. CrI3, as an example, has been recently demonstrated to exhibit distinct magnetic properties depending on the layer thickness and stacking order. Bulk CrI3 is ferromagnetic (FM) with a Curie temperature of 61 K and a rhombohedral layer stacking, while few-layer CrI3 has a layered antiferromagnetic (AFM) phase with a lower ordering temperature of 45 K and a monoclinic stacking. In this work, we use cryogenic magnetic force microscopy to investigate CrI3 flakes in the intermediate thickness range (25-200 nm) and find that the two types of magnetic orders hence the stacking orders can coexist in the same flake, with a layer of similar to 13 nm at each surface being in the layered AFM phase similar to few-layer CrI3 and the rest in the bulk FM phase. The switching of the bulk moment proceeds through a remnant state with nearly compensated magnetic moment along the c-axis, indicating formation of c-axis domains allowed by a weak interlayer coupling strength in the rhombohedral phase. Our results provide a comprehensive picture on the magnetism in CrI3 and point to the possibility of engineering magnetic heterostructures within the same material.
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