Chiral symmetry breaking for deterministic switching of perpendicular magnetization by spin-orbit torque
arXiv:2004.13872 · doi:10.1021/acs.nanolett.0c03972
Abstract
Symmetry breaking is a characteristic to determine which branch of a bifurcation system follows upon crossing a critical point. Specifically, in spin-orbit torque (SOT) devices, a fundamental question arises: how to break the symmetry of the perpendicular magnetic moment by the in-plane spin polarization? Here, we show that the chiral symmetry breaking by the DMI can induce the deterministic SOT switching of the perpendicular magnetization. By introducing a gradient of saturation magnetization or magnetic anisotropy, non-collinear spin textures are formed by the gradient of effective SOT strength, and thus the chiral symmetry of the SOT-induced spin textures is broken by the DMI, resulting in the deterministic magnetization switching. We introduce a strategy to induce an out-of-plane (z) gradient of magnetic properties, as a practical solution for the wafer-scale manufacture of SOT devices.
16 pages, 4 figures
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Cited by in corpus (12)
- Roadmap of spin-orbit torques
- Field-free spin-orbit torque-induced switching of perpendicular magnetization in a ferrimagnetic layer with vertical composition gradient
- Chirality as Generalized Spin-Orbit Interaction in Spintronics
- Field-free spin-orbit torque switching enabled by interlayer Dzyaloshinskii-Moriya interaction
- Switching of Perpendicular Magnetization by Spin-Orbit Torque
- Growth-dependent Interlayer Chiral Exchange and Field-free Switching
- Gradient-induced Dzyaloshinskii-Moriya interaction
- Role of the chiral spin configuration in field-free spin-orbit torque-induced magnetization switching by a locally injected spin current
- Current controlled non-hysteresis magnetic switching in the ansence of magnetic field
- Anomalous switching pattern in the ferrimagnetic memory cell
- Shape Anisotropy Enabled Field Free Switching of Perpendicular Nanomagnets
- Asymmetric defect distribution generates bulk Dzyaloshinskii-Moriya interaction in Pt/Co/Pt