Agility of vortex-based nanocontact spin torque oscillators

Details Agility of vortex-based nanocontact spin torque oscillators Agility of vortex-based nanocontact spin torque oscillators

2009-10-10

arxiv.org/abs/0910.1941v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 3 figures

Scientific paper

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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