Dielectric tunability of magnetic properties in orthorhombic ferromagnetic monolayer CrSBr

Abstract

Monolayer CrSBr is a recently discovered semiconducting spin-3/2 ferromagnet with a Curie temperature around 146 K. Unlike many other known two-dimensional (2D) magnets, CrSBr has an orthorhombic lattice, giving rise, for instance, to spatial anisotropy of the magnetic excitations within the 2D plane. Theoretical description of CrSBr within a spin Hamiltonian approach turns out to be nontrivial due to the triaxial magnetic anisotropy as well as due to magnetic dipolar interactions, comparable to spin-orbit effects in CrSBr. Here, we employ a Green's function formalism combined with first-principles calculations to systematically study the magnetic properties of monolayer CrSBr in different regimes of surrounding dielectric screening. We find that the magnetic anisotropy and thermodynamical properties of CrSBr depend significantly on the Coulomb interaction and its external screening. In the free-standing limit, the system turns out to be close to an easy-plane magnet, whose long-range ordering is partially suppressed. On the contrary, in the regime of large external screening, monolayer CrSBr behaves like an easy-axis ferromagnet with more stable magnetic ordering. Despite being relatively large, the magnetic dipolar interactions have only little effect on the magnetic properties. Our findings suggests that 2D CrSBr is suitable platform for studying the effects of substrate screening on magnetic ordering in low dimensions.

arXiv comment11 pages, 8 figures

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• Anisotropic effects in two-dimensional materials
• Programmable Magnetic Hysteresis in Orthogonally-Twisted Two-Dimensional CrSBr Magnets via Stacking Engineering
• Charge transfer-induced Lifshitz transition and magnetic symmetry breaking in ultrathin CrSBr crystals
• Defect complexes in CrSBr revealed through electron microscopy and deep learning
• Spin waves in the bilayer van der Waals magnet CrSBr
• Control of magnetic transition, metal-semiconductor transition, and magnetic anisotropy in noncentrosymmetric monolayer Cr${}_2$Ge${}_2$Se${}_3$Te${}_3$
• Theory of interaction-induced charge order in CrSBr
• Crystallographic Orientation-Dependent Magnetotransport in the Layered Antiferromagnet -- CrSBr