Measurement of nonlinear frequency shift coefficient in spin-torque oscillators based on MgO tunnel junctions

Details Measurement of nonlinear frequency shift coefficient in spin-torque oscillators based on MgO tunnel junctions Measurement of nonlinear frequency shift coefficient in spin-torque oscillators based on MgO tunnel junctions

2009-06-29

arxiv.org/abs/0906.5224v1

Physics

Condensed Matter

Materials Science

4 pages, 5 figures; accepted for publication in Applied Physics Letters

Scientific paper

The nonlinear frequency shift coefficient, which represents the strength of the transformation of amplitude fluctuations into phase fluctuations of an oscillator, is measured for MgO-based spin-torque oscillators by analyzing the current dependence of the power spectrum. We have observed that linewidth against inverse normalized power plots show linear behavior below and above the oscillation threshold as predicted by the analytical theories for spin-torque oscillators. The magnitude of the coefficient is determined from the ratio of the linear slopes. Small magnitude of the coefficient has been obtained for the device exhibiting narrow linewidth at high bias current.

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