Critical current destabilizing perpendicular magnetization by the spin Hall effect

Abstract

The critical current needed to destabilize the magnetization of a perpendicular ferromagnet via the spin Hall effect is studied. Both the dampinglike and fieldlike torques associated with the spin current generated by the spin Hall effect is included in the Landau-Lifshitz-Gilbert equation to model the system. In the absence of the fieldlike torque, the critical current is independent of the damping constant and is much larger than that of conventional spin torque switching of collinear magnetic systems, as in magnetic tunnel junctions. With the fieldlike torque included, we find that the critical current scales with the damping constant as ${\alpha }^0$ (i.e., damping independent),$\alpha$, and ${\alpha }^{1/2}$ depending on the sign of the fieldlike torque and other parameters such as the external field. Numerical and analytical results show that the critical current can be significantly reduced when the fieldlike torque possesses the appropriate sign, i.e. when the effective field associated with the fieldlike torque is pointing opposite to the spin direction of the incoming electrons. These results provide a pathway to reducing the current needed to switch magnetization using the spin Hall effect.

12 pages, 8 figures

References in corpus (6)

• Non-collinear Magnetoelectronics
• Anomalous Bias Dependence of Spin Torque in Magnetic Tunnel Junctions
• Angular and temperature dependence of current induced spin-orbit effective fields in Ta/CoFeB/MgO nanowires
• Phase diagram and optimal switching induced by spin Hall effect in a perpendicular magnetic layer
• Nonlinear analysis of magnetization dynamics excited by spin Hall effect
• Large amplitude oscillation of magnetization in spin-torque oscillator stabilized by field-like torque

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• Spin-orbit torque switching of perpendicular magnetization in ferromagnetic trilayers
• Effects of Oxidation of Top and Bottom Interfaces on the Electric, Magnetic, and Spin-Orbit Torque Properties of Pt/Co/AlOx Trilayers
• Theoretical condition for switching the magnetization in a perpendicularly magnetized ferromagnet via the spin Hall effect
• Tailoring the switching efficiency of magnetic tunnel junctions by the fieldlike spin-orbit torque
• A Perspective on Electrical Generation of Spin Current for Magnetic Random Access Memories
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• Dependency of high-speed write properties on external magnetic field in spin-orbit torque in-plane magnetoresistance devices
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• Optimal protocol for spin-orbit torque switching of a perpendicular nanomagnet
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• CoFeAlB alloy with low damping and low magnetization for spin transfer torque switching
• Out-of-plane magnetization oscillation in spin Hall device assisted by field-like torque
• Intrinsic back-switching phenomenon in SOT-MRAM devices
• Threshold current of field-free perpendicular magnetization switching using anomalous spin-orbit torque
• Length-scale independent skyrmion and meron Hall angles
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• Initialization-Free Multistate Memristor: Synergy of Spin-Orbit Torque and Magnetic Fields
• Electrical control of metallic heavy-metal/ferromagnet interfacial states
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