Electrically-Tunable High Curie Temperature Two-Dimensional Ferromagnetism in Van der Waals Layered Crystals

Abstract

Identifying intrinsic low-dimensional ferromagnets with high transition temperature and electrically tunable magnetism is crucial for the development of miniaturized spintronics and magnetoelectrics. Recently long-range 2D ferromagnetism was observed in van der Waals crystals CrI${}_3$ and Cr${}_2$Ge${}_2$Te${}_6$, however their Curie temperature is significantly lowered when reducing down to monolayer/few layers. Herein, using renormalized spin-wave theory and first-principles electronic structure theory, we present a theoretical study of electrically tunable 2D ferromagnetism in van der Waals layered CrSBr and CrSeBr semiconductors with high Curie temperature of ~150K and sizable band gap. High transition temperature is attributed to strong anion-mediated superexchange interaction and a sizable spin-wave excitation gap due to large exchange and single-ion anisotropy. Remarkably, hole and electron doping can switch magnetization easy axis from in-plane to out-of-plane direction. These unique characteristics establish monolayer CrSBr and CrSeBr as promising platform for realizing 2D spintronics and magnetoelectrics such as 2D spin field effect transistor.

arXiv comment9 pages, 3 figures. The following article has beenaccepted by Applied Physics Letters. After it is published, it will be found at APL

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• The bulk van der Waals layered magnet CrSBr is a quasi-1D material
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• Triaxial magnetic anisotropy in the two-dimensional ferromagnetic semiconductor CrSBr
• Atomistic spin textures on-demand in the van der Waals layered magnet CrSBr
• Magnetic Properties of NbSi2N4, VSi2N4, and VSi2P4 Monolayers
• Multistep magnetization switching in orthogonally twisted ferromagnetic monolayers
• Probing the spin dimensionality in single-layer CrSBr van der Waals heterostructures by magneto-transport measurements
• Spin waves and magnetic exchange Hamiltonian in CrSBr
• Probing defects and spin-phonon coupling in CrSBr via resonant Raman scattering
• Magnon straintronics in the 2D van der Waals ferromagnet CrSBr from first-principles
• Sensing the local magnetic environment through optically active defects in a layered magnetic semiconductor
• Visualizing Atomically-Layered Magnetism in CrSBr
• Doping-control of excitons and magnetism in few-layer CrSBr
• Raman scattering signatures of the strong spin-phonon coupling in the bulk magnetic van der Waals material CrSBr
• Nanoscale magnetism and magnetic phase transitions in atomically thin CrSBr
• Electrically tunable magnetism and unique intralayer charge transfer in Janus monolayer MnSSe for spintronics applications
• Paramagnetic Electronic Structure of CrSBr: Comparison between Ab Initio GW Theory and Angle-Resolved Photoemission Spectroscopy
• Structural, electronic, and magnetic properties of CrTe2
• Dielectric tunability of magnetic properties in orthorhombic ferromagnetic monolayer CrSBr
• Quantum anomalous Hall effect in two-dimensional magnetic insulator heterojunctions
• Magnon-mediated exciton-exciton interaction in a van der Waals antiferromagnet
• Magnetic imaging and domain nucleation in CrSBr down to the 2D limit
• Designing magnetic properties in CrSBr through hydrostatic pressure and ligand substitution
• The first- and second-order magneto-optical effects and intrinsically anomalous transport in 2D van der Waals layered magnets CrXY (X = S, Se, Te; Y = Cl, Br, I)
• Surface-Dominated Quantum Metric-Induced Nonlinear Transport in the Layered Antiferromagnet CrSBr
• CrSbSe3: a pseudo one-dimensional ferromagnetic semiconductor
• Electrically tunable room-temperature ferromagnetism in CrBr${}_3$
• Directional Flow of Confined Polaritons in CrSBr
• Resonant X-ray spectroscopies on Chromium $3\text{d}$ orbitals in CrSBr
• Excitonic optical absorption in strained monolayer CrSBr