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Agility of vortex-based nanocontact spin torque oscillators

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arxiv 0910.1941 v1 pith:JAPBVCUT submitted 2009-10-10 cond-mat.mes-hall cond-mat.mtrl-sciphysics.app-ph

Agility of vortex-based nanocontact spin torque oscillators

M. Manfrini , T. Devolder , Joo-Von Kim , P. Crozat , N. Zerounian , C. Chappert , W. Van Roy , L. Lagae
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G. Hrkac T. Schrefl
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classification cond-mat.mes-hall cond-mat.mtrl-sciphysics.app-ph
keywords agilityoscillatorsfrequencyoscillatorabruptanticipatedapplicationsapply
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We study the agility of current-tunable oscillators based on a magnetic vortex orbiting around a point contact in spin-valves. Theory predicts frequency-tuning by currents occurs at constant orbital radius, so an exceptional agility is anticipated. To test this, we have inserted an oscillator in a microwave interferometer to apply abrupt current variations while time resolving its emission. Using frequency shift keying, we show that the oscillator can switch between two stabilized frequencies differing by 25% in less than ten periods. With a wide frequency tunability and a good agility, such oscillators possess desirable figures of merit for modulation-based rf applications.

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