Thermally-Assisted Spin-Transfer Torque Dynamics in Energy Space

Abstract

We consider the general Landau-Lifshitz-Gilbert theory underlying the magnetization dynamics of a macrospin magnet subject to spin-torque effects and thermal fluctuations. Thermally activated dynamical properties are analyzed by averaging the full magnetization equations over constant- energy orbits. After averaging, all the relevant dynamical scenarios are a function of the ratio between hard and easy axis anisotropies. We derive analytically the range of currents for which limit cycles exist and discuss the regimes in which the constant energy orbit averaging technique is applicable.

References in corpus (5)

• Nonequilibrium quantum criticality in open electronic systems
• Spin-torque switching: Fokker-Planck rate calculation
• Thermally assisted spin transfer torque switching in synthetic free layers
• Spin torque switching of an in-plane magnetized system in a thermally activated region
• Thermally-Assisted Spin-Transfer Torque Magnetization Reversal in Uniaxial Nanomagnets

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• Current dependence of spin torque switching rate based on Fokker-Planck approach
• Large Fluctuations and Singular Behavior of Nonequilibrium Systems
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• A reduced model for precessional switching of thin-film nanomagnets under the influence of spin-torque
• Damping dependence of spin-torque effects in thermally assisted magnetization reversal
• Switching time of spin-torque-driven magnetization in biaxial ferromagnets
• Modeling the computer memory based on the ferromagnet/superconductor multilayers