Optimal control of stochastic magnetization dynamics by spin current
Department of Physics, The University of Hong Kong - Hong Kong SAR, China
Received: 22 February 2013
Accepted: 6 May 2013
Fluctuation-induced stochastic magnetization dynamics plays an important role in spintronics devices. Here we propose that it can be optimally controlled by spin currents to minimize or maximize the Freidlin-Wentzell action functional of the system hence to increase or decrease the probability of the large fluctuations. We apply this method to study the thermally activated magnetization switching problem and to demonstrate the merits of the optimal control strategy.
PACS: 75.78.-n – Magnetization dynamics / 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion / 75.76.+j – Spin transport effects
© EPLA, 2013