Single-layer spin-orbit-torque magnetization switching due to spin Berry curvature generated by minute spontaneous atomic displacement in a Weyl oxide
arXiv:2411.01806 · doi:10.1002/adma.202416091
Abstract
Spin Berry curvature characterizes the band topology as the spin counterpart of Berry curvature and is crucial in generating novel spintronics functionalities. By breaking the crystalline inversion symmetry, the spin Berry curvature is expected to be significantly enhanced; this enhancement will increase the intrinsic spin Hall effect in ferromagnetic materials and, thus, the spin-orbit torques (SOTs). However, this intriguing approach has not been applied to devices; generally, the extrinsic spin Hall effect in ferromagnet/heavy-metal bilayer is used for SOT magnetization switching. Here, SOT-induced partial magnetization switching is demonstrated in a single layer of a single-crystalline Weyl oxide SrRuO3 (SRO) with a small current density of ~3.1{\times}10^6 A cm-2. Detailed analysis of the crystal structure in the seemingly perfect periodic lattice of the SRO film reveals barely discernible oxygen octahedral rotations with angles of ~5° near the interface with a substrate. Tight-binding calculations indicate that a large spin Hall conductivity is induced around small gaps generated at band crossings by the synergy of inherent spin-orbit coupling and band inversion due to the rotations, causing magnetization reversal. Our results indicate that a minute atomic displacement in single-crystal films can induce strong intrinsic SOTs that are useful for spin-orbitronics devices.
39 pages, 5 figures in the main text, 9 figures in Supporting Information
References in corpus (18)
- Spin torque switching with the giant spin Hall effect of tantalum
- Evidence for reversible control of magnetization in a ferromagnetic material via spin-orbit magnetic field
- Intrinsic spin Hall effect in platinum metal
- Central role of domain wall depinning for perpendicular magnetization switching driven by spin torque from the spin Hall effect
- Field-free spin-orbit torque-induced switching of perpendicular magnetization in a ferrimagnetic layer with vertical composition gradient
- Weyl fermions and the anomalous Hall effect in metallic ferromagnets
- Quantum transport evidence of Weyl fermions in an epitaxial ferromagnetic oxide
- Electrical switching of perpendicular magnetization in L10 FePt single layer
- An Intrinsic Spin Orbit Torque Nano-Oscillator
- Current-induced magnetization switching in CoTb amorphous single layer
- Exceptionally high, strongly temperature dependent, spin Hall conductivity of SrRuO3
- Theory of magnetism and metal-insulator transition in layered perovskite iridates
- Theory of Large Intrinsic Spin Hall Effect in Iridate Semimetals
- Giant bulk spin-orbit torque and efficient electrical switching in single ferrimagnetic FeTb layers with strong perpendicular magnetic anisotropy
- Efficient current-induced domain-wall displacement SrRuO3
- Strong variation of spin-orbit torques with relative spin relaxation rates in ferrimagnets
- Disorder dependent spin-orbit torques in L10 FePt single layer
- Intrinsic torques emerging from anomalous velocity in magnetic textures