Direct experimental measurement of phase-amplitude coupling in spin torque oscillators

Details Direct experimental measurement of phase-amplitude coupling in spin torque oscillators Direct experimental measurement of phase-amplitude coupling in spin torque oscillators

2010-04-29

arxiv.org/abs/1004.5319v2

Appl. Phys. Lett. 97, 032502 (2010)

Physics

Condensed Matter

Materials Science

3 pages, 3 figures

Scientific paper

10.1063/1.3467043

We study spin-torque induced oscillations of MgO magnetic tunnel junctions in the time domain. By using the Hilbert transform on the time traces, we obtain for the first time a direct experimental measure of the coupling between the power and the phase fluctuations. We deduce the power restoration rate and we obtain low values for the coupling strength, which is consistent with the weak frequency dependence on the applied voltage.

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