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

Philipp Durrenfeld, Ezio Iacocca, Johan Akerman, Pranaba K. Muduli

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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.
Original languageEnglish
Article number052410
JournalApplied Physics Letters
Volume104
Issue number5
DOIs
Publication statusPublished - 3 Feb 2014
Externally publishedYes

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