Current induced Spin Torque in a nanomagnet
arXiv:cond-mat/0411375 · doi:10.1103/PhysRevLett.94.247206
Abstract
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.
5 pages, 3 figures to appear in Phys. Rev. Lett
References in corpus (6)
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- Magnetoresistance and collective Coulomb blockade in super-lattices of ferromagnetic CoFe nanoparticles
- Current-induced spin torques in III-V ferromagnetic semiconductors
- Theory of Spin Torque in a nanomagnet
- Detecting and Switching Magnetization of Stoner Nanograin in Non-local Spin Valve
- Microwave coupled electron tunneling measurement of Co nanoparticles
- Gate-dependent spin-torque in a nanoconductor-based spin-valve
- Spin-Noise and Damping in Individual Metallic Ferromagnetic Nanoparticles