Iodine orbital moment and chromium anisotropy contributions to CrI3 magnetism

被引:8
|
作者
Choi, Y. [1 ]
Ryan, P. J. [1 ]
Haskel, D. [1 ]
McChesney, J. L. [1 ]
Fabbris, G. [1 ]
McGuire, M. A. [2 ]
Kim, J-W [1 ]
机构
[1] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA
[2] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA
关键词
RAY CIRCULAR-DICHROISM; FERROMAGNETISM; CRYSTAL;
D O I
10.1063/5.0012748
中图分类号
O59 [应用物理学];
学科分类号
摘要
The recent discovery of two-dimensional (2D) magnets, with a number of interesting magnetic properties, has drawn much interest due to their potential for future 2D spintronic device applications. CrI3, a van der Waals magnet, exhibits two-dimensional ferromagnetism even in monolayer form, stabilized by strong magnetic anisotropy. Its interlayer magnetic ordering is coupled to structural layer stacking, implying that the charge density distribution mediating van der Waals interactions plays a key role in the magnetic interaction between the layers. Using polarization-dependent x-ray spectroscopy, we investigated the response of the electronic environment around Cr and I sites to structural changes of layer stacking order. The highly anisotropic nature of the Cr local environment is significantly enhanced and is accompanied by changes in the valence band, in the rhombohedral phase. Magnetic spectroscopy measurements reveal a sizable iodine orbital moment, indicating the iodine contribution to magnetic anisotropy. Our results uncover an important role for the extended nature of anisotropic Cr orbital states in dictating interlayer magnetic interactions and the iodine contribution to magnetic anisotropy.
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页数:5
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