Parametric excitation in a magnetic tunnel junction-based spin torque oscillator

Dürrenfeld, P., Iacocca, Ezio, Åkerman, J. and Muduli, P. K. (2014) Parametric excitation in a magnetic tunnel junction-based spin torque oscillator. Applied Physics Letters, 104 (5). 052410. ISSN 0003-6951

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Abstract

Using microwave current injection at room temperature, we demonstrate parametric excitation of a magnetic tunnel junction (MTJ)-based spin-torque oscillator (STO). Parametric excitation is observed for currents below the auto-oscillation threshold, when the microwave current frequency fe is twice the STO free-running frequency f0. Above threshold, the MTJ becomes parametrically synchronized. In the synchronized state, the STO exhibits an integrated power up to 5 times higher and a linewidth reduction of two orders of magnitude, compared to free-running conditions. We also show that the parametric synchronization favors single mode oscillations in the case of multimode excitation.

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