Large amplitude microwave emission and reduced nonlinear phase noise in Co2Fe(Ge0.5Ga0.5) Heusler alloy based pseudo spin valve nanopillars
arXiv:1111.4539 · doi:10.1063/1.3647771
Abstract
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.
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- Large amplitude microwave emission and reduced nonlinear phase noise in Co2Fe(Ge0.5Ga0.5) Heusler alloy based pseudo spin valve nanopillars
Cited by in corpus (9)
- Spin transfer nano-oscillators
- Critical Field of Spin Torque Oscillator with Perpendicularly Magnetized Free Layer
- Large amplitude microwave emission and reduced nonlinear phase noise in Co2Fe(Ge0.5Ga0.5) Heusler alloy based pseudo spin valve nanopillars
- Self-Oscillation in Spin Torque Oscillator Stabilized by Field-like Torque
- Relaxation time and critical slowing down of a spin-torque oscillator
- Theoretical Study of Spin-Torque Oscillator with Perpendicularly Magnetized Free Layer
- Linewidth of Power Spectrum Originated from Thermal Noise in Spin Torque Oscillator
- A quasi-linear spin-torque nano-oscillator via enhanced negative feedback of power fluctuations
- Role of Magnetic Field in Self-Oscillation of Nanomagnet Excited by Spin Torque