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

Journal Article · Mon Dec 02 00:00:00 EST 2013 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4838655· OSTI ID:22253926

Pi, K.; Zakai, R.; Childress, J. R.; Gurney, B. A. ^[1]

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1. HGST, 3404 Yerba Buena Rd., San Jose, California 95135 (United States)

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.

• OSTI ID: 22253926
• Journal Information: Applied Physics Letters, Vol. 103, Issue 23; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COUPLING
DIPOLES
LAYERS
MAGNETIC FIELDS
MICROWAVE RADIATION
OSCILLATIONS
OSCILLATORS
POTENTIALS
SIGNALS
SIMULATION
SPIN
SPIN ORIENTATION