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.

arXiv comment4pages, 2 figures

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Cited by in corpus (4)

• Stochastic thermodynamics of macrospins with fluctuating amplitude and direction
• Macrospin in external magnetic field: Entropy production and fluctuation theorems
• Optimal Control of Stochastic Magnetization Dynamics by Spin Current
• Rotational diffusion under torque: Microscopic reversibility and excess entropy