Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-11-19
Appl. Phys. Lett. 99, 162508 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
We have studied microwave emission from a current-perpendicular-to-plane pseudo spin valve nanopillars with Heusler alloy Co2Fe(Ga0.5Ge0.5) electrodes. Large emission amplitude exceeding 150 nV/Hz^0.5, partly owing to the large magnetoresistance, and narrow generation linewidth below 10 MHz are observed. We also find that the linewidth shows significant dependence on the applied field magnitude and its angle within the film plane. A minimum in the linewidth is observed when the slope of the frequency versus current becomes near zero. This agrees with theoretical prediction that takes into account non-linear phase noise as a source for linewidth broadening.
Drapeko Maksim
Hayashi Masamitsu
Hono Kazuhiro
Mitani Seiji
Sinha Jaivardhan
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