The miniaturisation of magnetic read heads and random access memory elements makes them vulnerable to thermal fluctuations. We demonstrate how current-induced spin-transfer torques can be used to suppress the effects of thermal fluctuations. This enhances the fidelity of perpendicular magnetic spin valves. The simplest realization is a dc current to stabilize the free magnetic layers. The power can be significantly reduced without losing fidelity by simple control schemes, in which the stabilizing current-induced spin-transfer torque is controlled by the instantaneous resistance.
@article{arxiv.1010.4954,
title = {Feedback control of noise in spin valves by the spin-transfer torque},
author = {Swarnali Bandopadhyay and Arne Brataas and Gerrit E. W. Bauer},
journal= {arXiv preprint arXiv:1010.4954},
year = {2011}
}