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Vortex Nucleation Phase in Spin Torque Oscillators Based on Nanocontacts

Abstract : We study the starting up phase of a current-controlled oscillator based on a magnetic vortex orbiting around a nanocontact in a spin-valve. From the idle state, current pulses down to a few nanoseconds can create the vortex, which is detected through the electrical signature of its steady-state gyration. Two ns are needed to reach the in-current equilibrium. The process can then be described by an Arrhenius law, with an activation energy that is consistent with the Oersted-field-induced separation of a vortex-antivortex pair. Requirements for deterministic nucleation are deduced, with prospects for instant-on oscillator capability. Index Terms— Magnetic microwave devices, magnetoresistive devices.
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Submitted on : Thursday, June 13, 2019 - 4:42:43 PM
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T. Devolder, Joo-Von Kim, S. Petit-Watelot, R. Otxoa, C. Chappert, et al.. Vortex Nucleation Phase in Spin Torque Oscillators Based on Nanocontacts. IEEE Transactions on Magnetics, 2011, 47 (6), pp.1595 - 1598. ⟨10.1109/TMAG.2010.2101056⟩. ⟨hal-01654234⟩



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