Spin Transfer Torque with Spin Diffusion in Magnetic Tunnel Junctions

Abstract

Spin transport in magnetic tunnel junctions in the presence of spin diffusion is considered theoretically. Combining ballistic tunneling across the barrier and diffusive transport in the electrodes, we solve the spin dynamics equation in the metallic layers. We show that spin diffusion mixes the transverse spin current components and dramatically modifies the bias dependence of the effective spin transfer torque. This leads to a significant linear bias dependence of the out-of-plane torque, as well as a non-conventional thickness dependence of both spin torque components.

5 pages, 3 figures

References in corpus (8)

• Spin Transfer Torques
• Bias-driven large power microwave emission from MgO-based tunnel magnetoresistance devices
• Anomalous Bias Dependence of Spin Torque in Magnetic Tunnel Junctions
• Magnetoresistance and spin-transfer torque in magnetic tunnel junctions
• Ab initio studies of the spin-transfer torque in tunnel junctions
• Spin-transfer torque in magnetic tunnel junctions: Scattering theory
• Description of current-driven torques in magnetic tunnel junctions
• Signatures of asymmetric and inelastic tunneling on the spin torque bias dependence

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• Macrospin analysis of RF excitations within fully perpendicular magnetic tunnel junctions with second order easy-axis magnetic anisotropy contribution
• Emergence of giant spin-orbit torque in a two-dimensional hole gas on the hydrogen-terminated diamond surface
• Modeling and Simulation of Spin Transfer Torque Generated at Topological Insulator/Ferromagnetic Heterostructure