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Advances in Condensed Matter Physics
Volume 2012, Article ID 951976, 5 pages
http://dx.doi.org/10.1155/2012/951976
Research Article

Micromagnetic Study of Synchronization of Nonlinear Spin-Torque Oscillators to Microwave Current and Field

1Dipartimento di Elettronica, Informatica e Sistemistica, University della Calabria, Via P. Bucci 42C, 87036 Rende, Italy
2Dipartimento di Fisica della Materia e Ingegneria Elettronica, University degli studi di Messina, C.da di Dio, 98100 Messina, Italy
3Dipartimento di Elettrotecnica ed Elettronica, Politecnico di Bari, Via Orabona 4, 70125 Bari, Italy

Received 30 March 2012; Revised 17 July 2012; Accepted 23 July 2012

Academic Editor: Giancarlo Consolo

Copyright © 2012 M. Carpentieri et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The nonautonomous dynamics of spin-torque oscillators in presence of both microwave current and field has been numerically studied in nanostructured devices. When both microwave current and field are applied at the same frequency, integer phase locking at different locking ratio is found. In the locking region, a study of the intrinsic phase shift between the locking force (current or field) and the giant magnetoresistive signal as a function of the bias current is also exploited.