Current-induced Pinwheel Oscillations in Perpendicular Magnetic Anisotropy Spin Valve Nanopillars - Université de Lorraine Access content directly
Journal Articles IEEE Transactions on Magnetics Year : 2016

Current-induced Pinwheel Oscillations in Perpendicular Magnetic Anisotropy Spin Valve Nanopillars

Abstract

Nanopillar spin valve devices are typically comprised of two ferromagnetic layers: a reference layer and a free layer whose magnetic orientation can be changed by both an external magnetic field and through the introduction of spin-polarized electric current. Here we report the continuous repeated switching behavior of both the reference and free layers of a perpendicular spin valve made of Co/Pd and Co/Ni multilayers that arises for sufficiently large DC currents. This periodic switching of the two layers produces an oscillating signal in the MHz regime but is only observed for one sign of the applied current. The observed behavior agrees well with micromagnetic simulations. Index Terms-magnetic oscillator, spin transfer torque, oscillators, spin valves.
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Dates and versions

hal-02070469 , version 1 (18-03-2019)

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Richard Choi, J. A. Katine, Stéphane Mangin, Eric E. Fullerton. Current-induced Pinwheel Oscillations in Perpendicular Magnetic Anisotropy Spin Valve Nanopillars. IEEE Transactions on Magnetics, 2016, ⟨10.1109/TMAG.2016.2577628⟩. ⟨hal-02070469⟩
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