Quantum Dynamics of a Nanomagnet driven by Spin-Polarized Current

Details Quantum Dynamics of a Nanomagnet driven by Spin-Polarized Current Quantum Dynamics of a Nanomagnet driven by Spin-Polarized Current

2011-06-13

arxiv.org/abs/1106.2359v1

Phys. Rev. B 85, 092403 (2012)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.85.092403

A quantum theory of magnetization dynamics of a nanomagnet as a sequence of scatterings of each electron spin with the macrospin state of the magnetization results in each encounter a probability distribution of the magnetization recoil state associated with each outgoing state of the electron. The quantum trajectory of the magnetization contains the average motion tending in the large spin limit to the semi-classical results of spin transfer torque and the fluctuations giving rise to a quantum magnetization noise and an additional noise traceable to the current noise.

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