| 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: |
 Click here to retrieve PDF version of paper (443KB) |
