Comparison of frequency, linewidth, and output power in measurements of spin-transfer nanocontact oscillators

Published

December 13, 2006

Author(s)

William Rippard, Matthew Pufall, Stephen E. Russek

Abstract

We have measured the detailed dependence of the oscillation frequencies, linewidths, and output powers of spin-transfer nanocontact oscillators as functions of applied field strength, bias current, and angle of the applied magnetic field. For fields applied only moderately out of the plane of the film, the evolution of these properties is continuous. However, for fields applied more strongly out of plane they exhibit discontinuous evolution in both current and applied field. These discontinuities typically correlate with changes in the device resistance, changes in device output power, and a broadening of their spectral linewidths. However, away from these discontinuities, the oscillator output powers are larger and the linewidths narrower when compared to geometries having the fields applied at smaller angles. Our measurements suggest that the discontinuous evolution of the frequency with current and applied field results from an abrupt change in precessional mode of the free layer.

Citation

Physical Review B (Condensed Matter and Materials Physics)

Volume

74

Pub Type

Journals

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Keywords

magnetodynamics, nanomagnetics, spin torque, spin transfer, spin transfer oscillators

Citation

Rippard, W. , Pufall, M. and Russek, S. (2006), Comparison of frequency, linewidth, and output power in measurements of spin-transfer nanocontact oscillators, Physical Review B (Condensed Matter and Materials Physics), [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=32425 (Accessed November 21, 2024)