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 language | English |
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Article number | 192507 |
Journal | Applied Physics Letters |
Volume | 88 |
Issue number | 19 |
DOIs | |
Publication status | Published - 2006 |
Externally published | Yes |
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)