Central role of domain wall depinning for perpendicular magnetization switching driven by spin torque from the spin Hall effect

Abstract

We study deterministic magnetic reversal of a perpendicularly magnetized Co layer in a Co/MgO/Ta nano-square driven by spin Hall torque from an in-plane current flowing in an underlying Pt layer. The rate-limiting step of the switching process is domain-wall (DW) depinning by spin Hall torque via a thermally-assisted mechanism that eventually produces full reversal by domain expansion. An in-plane applied magnetic field collinear with the current is required, with the necessary field scale set by the need to overcome DW chirality imposed by the Dzyaloshinskii-Moriya interaction. Once Joule heating is taken into account the switching current density is quantitatively consistent with a spin Hall angle θ${}_{SH}$ $\approx$ 0.07 for 4 nm of Pt.

References in corpus (5)

• Spin Transfer Torques
• Creep and flow regimes of magnetic domain wall motion in ultrathin Pt/Co/Pt films with perpendicular anisotropy
• Matching domain wall configuration and spin-orbit torques for very efficient domain-wall motion
• CoFeB Thickness Dependence of Thermal Stability Factor in CoFeB/MgO Perpendicular Magnetic Tunnel Junctions
• Spin Hall effect versus Rashba torque: a Diffusive Approach

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