1,479 research outputs found
Theory of Spin Torque Assisted Thermal Switching of Single Free Layer
The spin torque assisted thermal switching of the single free layer was
studied theoretically. Based on the rate equation, we derived the theoretical
formulas of the most likely and mean switching currents of the sweep current
assisted magnetization switching, and found that the value of the exponent
in the switching rate formula significantly affects the estimation of the
retention time of magnetic random access memory. Based on the Fokker-Planck
approach, we also showed that the value of should be two, not unity as
argued in the previous works.Comment: submitted to IEEE Trans. Magn. as the conference proceedings of
Intermag 201
Theory of spin accumulation and spin transfer torque in a magnetic domain wall
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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