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Time Required to Injection-Lock Spin Torque Nanoscale Oscillators

Published

Author(s)

William H. Rippard, Matthew R. Pufall, Anthony B. Kos

Abstract

We have injection-locked a spin-transfer oscillator to a second-harmonic electrical input signal and measured the relative phase and amplitude of the device output as a function of DC current under steady-state conditions. The relative phase of the device varies quasi-linearly over the entire range of DC bias, although the averaged amplitude decreases significantly outside of the spectrally-determined locking range. By pulsing the injected microwaves, the time required for the device to phase-lock to the injected signal was measured as a function of microwave amplitude. The locking time varied quasi-linearly over the range of microwave amplitudes studied, with the shortest locking times being a few nanoseconds.
Citation
Applied Physics Letters
Volume
103
Issue
18

Keywords

Phase-locking
Created October 29, 2013, Updated November 10, 2018