Current induced Spin Torque in a nanomagnet

Details Current induced Spin Torque in a nanomagnet Current induced Spin Torque in a nanomagnet

2004-11-15

arxiv.org/abs/cond-mat/0411375v2

Phys. Rev. Lett. 94, 247206 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.94.247206

In a nanomagnet (whose total spin S< 1000), very small polarized currents can lead to magnetic reversal. Treating on the same footing the transport and magnetic properties of a nanomagnet connected to magnetic leads via tunneling barriers, we derive a closed equation for the time evolution of the magnetization. The interplay between Coulomb blockade phenomena and magnetism gives some additional structure to the current induced spin torque. In addition to the possibility of stabilizing uniform spin waves, we find that the system is highly hysteretic: up to three different magnetic states can be simultaneously stable in one region of the parameter (magnetic field and bias voltage) space.

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