Central role of domain wall depinning for perpendicular magnetization switching driven by spin torque from the spin Hall effect
- Central role of domain wall depinning for perpendicular magnetization switching driven by spin torque from the spin Hall effect
- 이억재; L. Q. Liu; C. F. Pai; Y. Li; H. W. Tseng; P. G. Gowtham; J. P. Park; D. C. Ralph; R. A. Buhrman
- Issue Date
- Physical review B, Condensed matter and materials physics
- VOL 89, NO 2-024418-8
- 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.
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