Theory of Current-Induced Magnetization Precession

Abstract

We solve appropriate drift-diffusion and Landau-Lifshitz-Gilbert equations to demonstrate that unpolarized current flow from a non-magnet into a ferromagnet can produce a precession-type instability of the magnetization. The fundamental origin of the instability is the difference in conductivity between majority spins and minority spins in the ferromagnet. This leads to spin accumulation and spin currents that carry angular momentum across the interface. The component of this angular momentum perpendicular to the magnetization drives precessional motion that is opposed by Gilbert damping. Neglecting magnetic anisotropy and magnetostatics, our approximate analytic and exact numerical solutions using realistic values for the material parameters show (for both semi-infinite and thin film geometries) that a linear instability occurs when both the current density and the excitation wave vector parallel to the interface are neither too small nor too large. For many aspects of the problem, the variation of the magnetization in the direction of the current flows makes an important contribution.

Submitted to Physical Review B

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Cited by in corpus (48)

• Spin Transfer Torques
• Nonlocal magnetization dynamics in ferromagnetic heterostructures
• Spin-transfer-driven ferromagnetic resonance of individual nanomagnets
• Synchronization of spin-transfer oscillators driven by stimulated microwave currents
• Boltzmann Test of Slonczewski's Theory of Spin Transfer Torque
• Spin-Torque Driven Magnetization Dynamics: Micromagnetic Modelling
• Spin Transfer Torque for Continuously Variable Magnetization
• Theory for a dissipative droplet soliton excited by a spin torque nanocontact
• Time-resolved detection of spin-transfer-driven ferromagnetic resonance and spin torque measurement in magnetic tunnel junctions
• Bias and angular dependence of spin-transfer torque in magnetic tunnel junctions
• Mechanisms limiting the coherence time of spontaneous magnetic oscillations driven by DC spin-polarized currents
• Large-amplitude coherent spin waves exited by spin-polarized current in nanoscale spin valves
• Current induced magnetization dynamics in current perpendicular to the plane spin valves
• Spin Pumping of Current in Non-Uniform Conducting Magnets
• A selfconsistent theory of current-induced switching of magnetization
• Current Induced Excitations in Cu/Co/Cu Single Ferromagnetic Layer Nanopillars
• Spin-Transfer Excitations of Permalloy Nanopillars for Large Applied Currents
• First--order continuous models of opinion formation
• Magnetization precession due to a spin polarized current in a thin nanoelement: numerical simulation study
• Model for a collimated spin wave beam generated by a single layer, spin torque nanocontact
• Time-Domain Studies of Very-Large-Angle Magnetization Dynamics Excited by Spin Transfer Torques
• Spin transfer torque in continuous textures: semiclassical Boltzmann approach
• Self-consistent calculation of spin transport and magnetization dynamics
• Effects of spin current on ferromagnets
• Current-induced macrospin vs spin-wave excitations in spin valves
• Spin Accumulation at Ferromagnet/Non-magnetic Material Interfaces
• A numerical method to solve the Boltzmann equation for a spin valve
• Mitigation of Gilbert Damping in the CoFe/CuOx Orbital Torque System
• Spin-transfer in an open ferromagnetic layer: from negative damping to effective temperature
• Bipolar High Field Excitations in Co/Cu/Co Nanopillars
• Current-induced switching in single ferromagnetic layer nanopillar junctions
• Surface Spin-valve Effect
• Spectroscopy of phonons and spin torques in magnetic point contacts
• Current induced transverse spin-wave instability in thin ferromagnets: beyond linear stability analysis
• Magnetization reversal driven by spin-injection : a mesoscopic spin-transfer effect
• Magnon instability driven by heat current in magnetic bilayers
• Different spin relaxation property observed in linearly and circularly polarized laser induced terahertz emission from Bi/Co bilayer
• Nanofabrication of spin-transfer torque devices by a PMMA mask one step process: GMR versus single layer devices
• Focused-ion-beam milling based nanostencil mask fabrication for spin transfer torque studies
• Spin injection and pumping generated by a direct current flowing through a magnetic tunnel junction
• Optimal control of magnetization dynamics in ferromagnetic heterostructures by spin--polarized currents
• Current-induced magnetization reversal in SrRuO3
• Current driven spin-wave instability triggered by the anomalous Hall effect
• Current Driven tri-stable Resistance States in Magnetic Point Contacts
• Current-induced magnetization dynamics in single and double layer magnetic nanopillars grown by molecular beam epitaxy
• Spin-transfer-induced excitations in bilayer magnetic nanopillars at high fields: The effects of contact layers
• Alternating Spintronics: Capacitive Behavior of Spin Valves and Resonator Applications
• Spin-Torque and Spin-Hall Nano-Oscillators