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In this paper, we employ micromagnetic simulations to study non-adiabaticstochastic resonance (NASR) excited by spin-transfer torque in asuper-paramagnetic free layer nanomagnet of a nanoscale spin valve. We findthat NASR dynamics involves thermally activated transitions among two staticstates and a single dynamic state of the nanomagnet and can be well understoodin the framework of Markov chain rate theory. Our simulations show that adirect voltage generated by the spin valve at the NASR frequency is at leastone order of magnitude greater than the dc voltage generated off the NASRfrequency. Our computations also reproduce the main experimentally observedfeatures of NASR such as the resonance frequency, the temperature dependenceand the current bias dependence of the resonance amplitude. We propose a simpledesign of a microwave signal detector based on NASR driven by spin transfertorque.

Micromagnetic understanding of stochastic resonance driven by spin-transfertorque