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

Title
Central role of domain wall depinning for perpendicular magnetization switching driven by spin torque from the spin Hall effect
Authors
이억재L. Q. LiuC. F. PaiY. LiH. W. TsengP. G. GowthamJ. P. ParkD. C. RalphR. A. Buhrman
Issue Date
2014-01
Publisher
Physical review B, Condensed matter and materials physics
Citation
VOL 89, NO 2-024418-8
Abstract
We study deterministic magnetic reversal of a perpendicularly magnetized Co layer in a Co/MgO/Ta nanosquare 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 theta(SH) approximate to 0.07 for 4 nm of Pt.
URI
http://pubs.kist.re.kr/handle/201004/65304
ISSN
2469-9950
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