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Modulation-mediated unlocking of a parametrically phase-locked spin torque oscillator

Journal article
Authors Philipp Dürrenfeld
Ezio Iacocca
Johan Åkerman
Pranaba Muduli Kishor
Published in Applied Physics Letters
Volume 105
Issue 25
ISSN 0003-6951
Publication year 2014
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1063/1.4904991
Keywords MAGNETIC TUNNEL-JUNCTIONS, POLARIZED CURRENT, DRIVEN, MULTILAYERS, GENERATION, EMISSION, Physics, Applied
Subject categories Physical Sciences

Abstract

Modulation of an oscillator is crucial for its application in communication devices. While the output power and linewidth of single magnetic tunnel junction-based spin-torque oscillators (MTJ-STO) are not yet adequate for practical uses, the synchronization of such devices can overcome these limitations. Here, we investigate the modulation behavior of a parametrically synchronized MTJ-STO and show experimentally that modulation of the synchronized state preserves synchronization as long as the modulation frequency, integral(mod), is above a characteristic frequency, integral(unlock). The unlocking frequency increases with the modulation amplitude in agreement with analytical estimates and numerical simulations. These phenomena are described as a non-resonant unlocking mechanism, whose characteristics are directly related to inherent parameters of the oscillator. (C) 2014 AIP Publishing LLC.

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