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

Journal Article · Mon Feb 03 00:00:00 EST 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4864166· OSTI ID:22283303

Dürrenfeld, P.; Iacocca, E. ^[1]; Åkerman, J. ^[1]; Muduli, P. K. ^[1]

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1. 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, Vol. 104, Issue 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COMPARATIVE EVALUATIONS
ELECTRIC CURRENTS
EXCITATION
MAGNETISM
MICROWAVE RADIATION
OSCILLATION MODES
OSCILLATIONS
OSCILLATORS
SPIN
SYNCHRONIZATION
TEMPERATURE RANGE 0273-0400 K
TORQUE
TUNNEL EFFECT