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

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, f{sub mod}, is above a characteristic frequency, f{sub 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.
Authors:
;  [1] ;  [1] ;  [2] ;  [1] ;  [3]
  1. Department of Physics, University of Gothenburg, 412 96 Gothenburg (Sweden)
  2. (Sweden)
  3. (India)
Publication Date:
OSTI Identifier:
22395583
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 25; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AMPLITUDES; COMPUTERIZED SIMULATION; LINE WIDTHS; MODULATION; NUMERICAL ANALYSIS; OSCILLATORS; SEMICONDUCTOR JUNCTIONS; SPIN; SYNCHRONIZATION; TORQUE; TUNNEL EFFECT