Journal
PHYSICAL REVIEW APPLIED
Volume 15, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.15.064053
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Funding
- Scientific and Technological Research Council of Turkey (TUBITAK) [119F361]
- [17A0443001]
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In this study, a two-dimensional phase of chromium bismuthate (CrBi) is investigated using density-functional theory, revealing exceptional magnetic and magneto-optical characteristics such as high Curie temperature, anisotropic magnetic ordering, nontrivial Berry curvature, anomalous Hall effect, and polar magneto-optical Kerr effect. These findings suggest that monolayer CrBi is a promising material for practical applications in magneto-optical and spintronic devices.
We present a density-functional-theory-based study of a two-dimensional phase of chromium bismuthate (CrBi), a previously unknown material with exceptional magnetic and magneto-optical characteristics. Monolayer CrBi is a ferromagnetic metal with strong spin-orbit coupling induced by the heavy bismuth atoms, resulting in a strongly anisotropic Ising-type magnetic ordering with the Curie temperature estimated to be higher than 300 K. The electronic structure of the system is topologically nontrivial, giving rise to a nonzero Berry curvature in the ground magnetic state, leading to the anomalous Hall effect with a conductivity plateau of about 1.5 e2/h at the Fermi level. Remarkably, the Hall conductivity and the magneto-optical constant are found to be strongly dependent on the direction of magnetization. Besides, monolayer CrBi demonstrates the polar magneto-optical Kerr effect in the visible and near-ultraviolet spectral ranges with the maximum rotation angles of up to 10 mrad. Our findings suggest that monolayer CrBi is a promising system for practical applications in magneto-optical and spintronic devices.
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