Experimental Test of Analytic Theory of Spin Torque Oscillator Dynamics

TL;DR

This study experimentally verifies an analytic theory predicting the spectral properties of spin torque nano-oscillators, demonstrating good agreement for moderate oscillation amplitudes.

Contribution

It provides the first comprehensive experimental validation of the analytic model for single-mode STNO dynamics across multiple spectral parameters.

Findings

Spectral power, frequency, and linewidth match theoretical predictions.

The theory accurately describes oscillator behavior for oscillation angles below 70 degrees.

Experimental results support the analytic model's applicability to real devices.

Abstract

We make measurements of power spectral density of the microwave voltage emitted by a spin torque nano-oscillator (STNO) and compare our experimental results to predictions of an analytic theory of a single-mode STNO dynamics by V. S. Tiberkevich, A. N. Slavin, J. V. Kim,[Phys. Rev. B 78, 092401 (2008)]. We find that a complete set of the oscillator spectral properties: power, frequency, spectral line width and line shape as functions of current are self-consistently described by the analytic theory for moderate amplitudes of oscillations (< 70 degrees).