Current-driven microwave oscillations in current perpendicular-to-plane spin-valve nanopillars

Q. Mistral, Joo Von Kim, T. Devolder, P. Crozat, C. Chappert, J. A. Katine, M. J. Carey, K. Ito

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106 Citations (Scopus)

Abstract

We study the current and temperature dependences of the microwave voltage emission of spin-valve nanopillars subjected to an in-plane magnetic field and a perpendicular-to-plane current. Despite the complex multilayer geometry, clear microwave emission is observed for current densities in the interval of 9× 107 -13× 107 A cm-2. The emission frequency stays near 12 GHz when I< Ired =11.2× 107 A cm-2, then redshifts with a slope gradually reaching -350 MHzmA for 16× 107 A cm-2. The linewidth narrows exponentially to 3.8 MHz at 150 K for I< Ired, then broadens again as the emitted voltage redshifts. The temperature dependence of the linewidth exhibits a curvature change around the linewidth minimum.

Original languageEnglish
Article number192507
JournalApplied Physics Letters
Volume88
Issue number19
DOIs
Publication statusPublished - 2006

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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