Magneto-optical Kerr effect and magnetoelasticity in weak ferromagnetic RuF${}_4$ monolayer

Abstract

Considerable research interest has been attracted to noncollinear magnetic structures for their intriguing physics and promising applications. In this work, based on relativistic density functional theory, we reveal the interesting magnetic order and relevant properties in monolayer RuF${}_4$, which can be exfoliated from its bulk phase. Although the spins on Ru ions are almost antiferromagnetically aligned between nearest-neighbors, weak ferromagnetism is generated because of the antisymmetric Dzyaloshinskii-Moriya interaction as well as the single-ion anisotropy. A prominent magneto-optical Kerr effect can be observed for this antiferromagnet, similar to those of regular strong ferromagnets. In addition, a uniaxial strain can induce a ferroelastic switching together with the in-plane rotation of spin direction, giving rise to a strong intrinsic magnetoelasticity. Our work not only suggests an alternative direction for two-dimensional magnetic materials, but also provides hints to future devices based on antiferromagnetic magnetoelastic or magneto-optical materials.

7 pages, 5 figures

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• Interplay of altermagnetism and weak ferromagnetism in two-dimensional RuF${}_4$
• Superconducting phenomena in systems with unconventional magnets
• Magneto-optical Kerr effect in ferroelectric antiferromagnetic two-dimensional heterostructures
• Layer Control of Magneto-Optical Effects and Their Quantization in Spin-Valley Splitting Antiferromagnets
• Ferroelasticity tunable altermagnets
• Non-linear anomalous Edelstein response at altermagnetic interfaces
• Altermagnetism and Anomalous Transport in Ag${}^{2+}$ Fluorides: KAgF${}_3$ and K${}_2$AgF${}_4$
• Time reversal reserved spin valve and spin transistor based on unconventional $p$-wave magnets