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|Author(s):||Mark W. Keller; Anthony B. Kos; Thomas J. Silva; William H. Rippard; Matthew R. Pufall;|
|Title:||Time domain measurement of phase noise in a spin torque oscillator|
|Published:||May 13, 2009|
|Abstract:||We measure phase noise from the zero crossings of the voltage vs. time waveform of a spin torque nanocontact oscillating in a vortex mode. The power spectrum of the phase noise varies with Fourier frequency f as 1/f2, consistent with frequency fluctuations driven by a thermal source. We compare the linewidth due to phase noise with that measured using a spectrum analyzer. A phase-locked loop reduces the phase noise for frequencies within its 3 MHz bandwidth.|
|Citation:||Applied Physics Letters|
|Keywords:||spin torque,phase noise,phase-locked loop|
|Research Areas:||Physics, Condensed Matter Physics|
|PDF version:||Click here to retrieve PDF version of paper (454KB)|