Portal de Periódicos da CAPES

Vortex Nucleation Phase in Spin Torque Oscillators Based on Nanocontacts

2011; IEEE Magnetics Society; Volume: 47; Issue: 6 Linguagem: Inglês

10.1109/tmag.2010.2101056

1941-0069

T. Devolder, Joo-Von Kim, S. Petit, R. M. Otxoa, C. Chappert, Mauricio Manfrini, W. Van Roy, Liesbet Lagae,

Physics of Superconductivity and Magnetism

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.