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Linear Phase Tuning of Spin Torque Oscillators Using In-Plane Microwave Fields

Journal article
Authors T. Zeng
Y. Zhou
Johan Åkerman
P. T. Lai
P. W. T. Pong
Published in Ieee Transactions on Magnetics
Volume 50
Issue 1, Pt 1
Pages Article Number: 1400104
ISSN 0018-9464
Publication year 2014
Published at Department of Physics (GU)
Pages Article Number: 1400104
Language en
Links dx.doi.org/10.1109/tmag.2013.227666...
Keywords Locking frequency, microwave field, phase lock, spin torque oscillator, polarized current, co/cu/co pillars
Subject categories Electrical Engineering, Electronic Engineering, Information Engineering, Physical Sciences

Abstract

We demonstrate numerically and analytically that a nano-pillar spin torque oscillator (STO), operating either with in-plane or out-ofplane free-layer precession, locks to a microwave field (H-ac) having the same frequency as the STO. By varying the spatial direction of the microwave field, we further show the preferred phase shift (Delta Phi(0)) between the STO and H-ac can be tuned in a linear fashion. We explain this phenomenon by using a magnetic-energy-based analysis. Our results provide a way to synchronize serially connected STOs by tuning the phase shift of each individual STO with external microwave field, which may enhance the locking efficiency, the locking range, and the output power of the serially connected STOs.

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