Magnetic dynamics with spin transfer torques near the Curie temperature

Abstract

We use atomistic stochastic Landau-Lifshitz-Slonczewski simulations to study the interaction between large thermal fluctuations and spin transfer torques in the magnetic layers of spin valves. At temperatures near the Curie temperature $T_{\mathrm{C}}$, spin currents measurably change the size of the magnetization (i.e. there is a {\it longitudinal} spin transfer effect). The change in magnetization of the free magnetic layer in a spin valve modifies the temperature dependence of the applied field-applied current phase diagram for temperatures near $T_{\mathrm{C}}$. These atomistic simulations can be accurately described by a Landau-Lifshitz-Bloch + Slonczewski equation, which is a thermally averaged mean field theory. Both the simulation and the mean field theory show that a longitudinal spin transfer effect can be a substantial fraction of the magnetization close to $T_{\mathrm{C}}$.

8 pages, 6 figures

References in corpus (8)

• Non-collinear Magnetoelectronics
• Dynamic approach for micromagnetics close to the Curie temperature
• Nonequilibrium quantum criticality in open electronic systems
• Spin-torque switching: Fokker-Planck rate calculation
• Thermal fluctuations and longitudinal relaxation of single-domain magnetic particles at elevated temperatures
• Domain-wall resistance in ferromagnetic (Ga,Mn)As
• Current driven quantum criticality in itinerant electron ferromagnets
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Cited by in corpus (4)

• The Landau-Lifshitz-Bloch equation for ferrimagnetic materials
• Theoretical Proposal for Determining Angular Momentum Compensation in Ferrimagnets
• Spin-torque-induced magnetization dynamics in ferrimagnets based on Landau-Lifshitz-Bloch Equation
• Derivation of a time dependent Schrödinger equation as quantum mechanical Landau-Lifshitz-Bloch equation