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Title: Zero field high frequency oscillations in dual free layer spin torque oscillators

We observe microwave oscillations in relatively simple spin valve spin torque oscillators consisting of two in-plane free layers without spin polarizing layers. These devices exhibit two distinct modes which can reach frequencies >25 GHz in the absence of an applied magnetic field. Macrospin simulations identify these two modes as optical and acoustic modes excited by the coupling of the two layers through dipole field and spin torque effects. These results demonstrate the potential of this system as a large output power, ultrahigh frequency signal generator that can operate without magnetic field.
Authors:
; ; ; ;  [1]
  1. HGST, 3404 Yerba Buena Rd., San Jose, California 95135 (United States)
Publication Date:
OSTI Identifier:
22253926
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 23; Other Information: (c) 2013 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; COUPLING; DIPOLES; LAYERS; MAGNETIC FIELDS; MICROWAVE RADIATION; OSCILLATIONS; OSCILLATORS; POTENTIALS; SIGNALS; SIMULATION; SPIN; SPIN ORIENTATION