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

By O. Lee, Luqiao Liu, C. Pai, Yulin Li, H. Tseng, P. Gowtham, Jiwoong Park, D. Ralph, Robert A. Buhrman. 2013

221 citations recorded by the source corpus.

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 {\theta}$_{SH}$ ${\approx}$ 0.07 for 4 nm of Pt.

Subfields: Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/a8707449a6af4a2d494c2f9df03314d8e9252df1

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In Atomic and Molecular Physics, and Optics

In Electronic, Optical and Magnetic Materials

Citations in the corpus

Giant Spin Hall Effect and Switching Induced by Spin-Transfer Torque in a W / Co 40 Fe 40 B 20 / MgO Structure with Perpendicular Magnetic Anisotropy (2015, background): “Particularly noteworthy is the phenomenon of the Giant Spin Hall Effect (GSHE) [4-13] in non-magnetic metals with strong spin-orbit coupling (SOC).”
Interface-Induced Phenomena in Magnetism (2016, unknown): “, 2012a], through nucleation of a reversed domain and spin-torque-driven domain wall propagation [Lee et al., 2014].”
Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems (2018, background): “The influence of tF on the SOT has been systematically investigated in Ta/CoFeB/MgO (Kim et al., 2013a), NiFe/Cu/Pt (Fan et al., 2013), Ti/CoFeB/Pt (Fan et al., 2014a), Co/Pt (Skinner et al., 2014), Ta/Pt/Co/MgO and Ta/Pt/Co50Fe50/MgO (Pai et al., 2015), and Pd/FePd (Lee et al., 2014a), all deposite”
Ultra-Fast Perpendicular Spin–Orbit Torque MRAM (2015, unknown): “nucleation followed by domain wall propagation[28], [34]–[41].”
Skyrmions in magnetic multilayers (2017, background): “It also provides an alternative explanation of the in-plane electrical current induced perpendicular magnetization switching in the presence of in-plane fields, in addition to the coherent rotation of macro spin model [69, 230, 231].”