Details

Autor(en) / Beteiligte

• Keller, Mark W
• Kos, A B
• Silva, T J
• Rippard, W H
• Pufall, M R

Titel

Time domain measurement of phase noise in a spin torque oscillator

Ist Teil von

• Applied physics letters, 2009-05, Vol.94 (19), p.193105-193105-3

Ort / Verlag

American Institute of Physics

Erscheinungsjahr

2009

Link zum Volltext

Quelle

AIP Journals Complete

Beschreibungen/Notizen

• We measure oscillator phase from the zero crossings of the voltage versus 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 / f 2 , consistent with frequency fluctuations driven by a thermal source. The linewidth implied by phase noise alone is about 70% of that measured using a spectrum analyzer. A phase-locked loop reduces the phase noise for frequencies within its 3 MHz bandwidth.