Parametric excitation in a magnetic tunnel junction-based spin torque oscillator
- Department of Physics, University of Gothenburg, 412 96 Gothenburg (Sweden)
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 f{sub e} is twice the STO free-running frequency f{sub 0}. 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.
- OSTI ID:
- 22283303
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 5 Vol. 104; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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