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

Journal article
Authors Philipp Dürrenfeld
Ezio Iacocca
Johan Åkerman
Pranaba Muduli Kishor
Published in Applied Physics Letters
Volume 104
Issue 5
ISSN 0003-6951
Publication year 2014
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1063/1.4864166
Keywords PHASE-LOCKING, NANO-OSCILLATORS, DRIVEN, MULTILAYERS, MODULATION, WAVES
Subject categories Physical Sciences

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 f(e) is twice the STO free-running frequency f(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. (C) 2014 AIP Publishing LLC.

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