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Publication Citation: Time domain measurement of phase noise in a spin torque oscillator

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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
Volume: 94
Pages: 5 pp.
Keywords: spin torque;phase noise;phase-locked loop
Research Areas: Physics, Condensed Matter Physics
PDF version: PDF Document Click here to retrieve PDF version of paper (454KB)