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EPL Association, European Physical Society Letters, 5(87), p. 57001

DOI: 10.1209/0295-5075/87/57001

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Auto-oscillation threshold and line narrowing in MgO-based spin-torque oscillators

Journal article published in 2008 by S. Cornelissen, M. Op de Beeck, L. Bianchini, G. Hrkac, M. Op de Beeck, L. Lagae, Joo-Von Kim ORCID, T. Devolder, P. Crozat ORCID, C. Chappert, T. Schrefl
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This paper is available in a repository.

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Abstract

We present an experimental study of the power spectrum of current-driven magnetization oscillations in MgO tunnel junctions under low bias. We find the existence of narrow spectral lines, down to 8 MHz in width at a frequency of 10.7 GHz, for small applied fields with clear evidence of an auto-oscillation threshold. Micromagnetics simulations indicate that the excited mode corresponds to an edge mode of the synthetic antiferromagnet.