Description of current-driven torques in magnetic tunnel junctions

Abstract

A free electron description of spin-dependent tranport in magnetic tunnel junctions with non collinear magnetizations is presented. We investigate the origin of transverse spin density in tunnelling transport and the quantum interferences which give rise to oscillatory torques on the local magnetization. Spin transfer torque is also analyzed and an important bias asymmetry is found as well as a damped oscillatory behaviour. Furthermore, we investigate the influence of the s-d exchange coupling on torque in particular in the case of half-metallic MTJ in which the spin transfer torque is due to interfacial spin-dependent reflections.

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Cited by in corpus (20)

• Spin-dependent phenomena and device concepts explored in (Ga,Mn)As
• Spin-transfer torque in magnetic tunnel junctions: Scattering theory
• Remotely induced magnetism in a normal metal using a superconducting spin-valve
• Nonlinear bias dependence of spin-transfer torque from atomic first principles
• Bias dependence of perpendicular spin torque and of free and fixed layer eigenmodes in MgO-based nanopillars
• Analytical description of ballistic spin currents and torques in magnetic tunnel junctions
• First-principles quantum transport modeling of spin-transfer and spin-orbit torques in magnetic multilayers
• Robust spin transfer torque in antiferromagnetic tunnel junctions
• Spin Transfer Torque with Spin Diffusion in Magnetic Tunnel Junctions
• Quantum spin-transfer torque induced nonclassical magnetization dynamics and electron-magnetization entanglement
• Signatures of asymmetric and inelastic tunneling on the spin torque bias dependence
• Spin-current vortices in current-perpendicular-to-plane nanoconstricted spin-valves
• Magnetic dynamics driven by the spin-current generated via spin-Seebeck effect
• Twist in the bias-dependence of spin-torques in magnetic tunnel junctions
• Enhancement of the spin transfer torque efficiency in magnetic STM junctions
• Spin torque from tunneling through impurities in a magnetic tunnel junction
• Efficient solution strategy to couple micromagnetic simulations with ballistic transport in magnetic tunnel junctions
• Giant spin transfer torque in atomically thin magnetic bilayers
• Theory of high-resolution tunneling spin transport on a magnetic skyrmion
• Adiabatic quantum pumping, magnification effects and quantum size effects of spin-torque in magnetic tunnel junctions