Feedback control of noise in spin valves by the spin-transfer torque

Abstract

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.

4pages, 2 figures

References in corpus (2)

• Spin Transfer Torques
• Suppression of spin-torque in current perpendicular to the plane spin-valves by addition of Dy cap layers