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Experimental study of current-driven vortex oscillations in magnetic nanocontacts

2009; SPIE; Volume: 7398; Linguagem: Inglês

10.1117/12.826879

1996-756X

T. Devolder, Joo-Von Kim, Mauricio Manfrini, G. Hrkac, P. Crozat, Liesbet Lagae, T. Schrefl, Claude Chappert,

Quantum and electron transport phenomena

The passage of spin-polarized currents through magnetic nanocontacts can lead to the excitation of self-sustained vortex oscillations in the free layer of a spin-valve stack. These oscillations involve the large amplitude translational motion of the vortex core about the contact region, with oscillation frequencies typically in the 200-500 MHz range. Here, we present a detailed experimental study of such current-driven vortex oscillations. In particular, we show that the oscillation mode is possible in zero applied magnetic field and is only stable within a range of in-plane applied fields.