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We have studied microwave emission from a current-perpendicular-to-planepseudo spin valve nanopillars with Heusler alloy Co2Fe(Ga0.5Ge0.5) electrodes.Large emission amplitude exceeding 150 nV/Hz^0.5, partly owing to the largemagnetoresistance, and narrow generation linewidth below 10 MHz are observed.We also find that the linewidth shows significant dependence on the appliedfield magnitude and its angle within the film plane. A minimum in the linewidthis observed when the slope of the frequency versus current becomes near zero.This agrees with theoretical prediction that takes into account non-linearphase noise as a source for linewidth broadening.

Large amplitude microwave emission and reduced nonlinear phase noise in Co2Fe(Ge0.5Ga0.5) Heusler alloy based pseudo spin valve nanopillars