A Quantum Approach of Meso-Magnet Dynamics with Spin Transfer Torque

Abstract

We present a theory of magnetization dynamics driven by spin-polarized current in terms of the quantum master equation. In the spin coherent state representation, the master equation becomes a Fokker-Planck equation, which naturally includes the spin transfer and quantum fluctuation. The current electron scattering state is correlated to the magnet quantum states, giving rise to quantum correction to the electron transport properties in the usual semiclassical theory. In the large spin limit, the magnetization dynamics is shown to obey the Hamilton-Jacobi equation or the Hamiltonian canonical equations.

7 pages, expanded version with 2 figures and appendix part

References in corpus (1)

• Spin Transfer Torques

Cited by in corpus (9)

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• Magnetization Dynamics driven by Non-equilibrium Spin-Orbit Coupled Electron Gas
• Quantum noise in the spin transfer torque effect