Theory of spin accumulation and spin transfer torque in a magnetic domain wall

Details Theory of spin accumulation and spin transfer torque in a magnetic domain wall Theory of spin accumulation and spin transfer torque in a magnetic domain wall

2009-02-24

arxiv.org/abs/0902.4094v2

Phys. Rev. B 79, 212410 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.79.212410

We study spin accumulation and spin transfer torque in a domain wall by solving the Boltzmann equation with a diffusion approximation. We obtained the analytical expressions of spin accumulation and spin transfer torque. Both the adiabatic and the non-adiabatic components of the spin transfer torque oscillate with the thickness of the domain wall. We show that the oscillation plays a dominant role in the non-adiabatic torque when the domain wall thickness is less than the spin-flip length, which is defined by the product of the Fermi velocity and the spin-flip scattering time.

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