Measurements of out-of-plane dynamics induced in magnetic nanopillars by spin transfer

Weng Lee Lim, Andrew Higgins, and Sergei Urazhdin
Phys. Rev. B 80, 104408 – Published 11 September 2009

Abstract

Electrical current can induce very large amplitude of precession in nanomagnets, resulting in highly nonlinear dynamical regimes unattainable by any other means of excitation. We performed spectroscopic measurements of magnetic nanodevices whose geometry was optimized for coherent dynamics at high currents. The dependence of the observed spectroscopic features on the direction of the magnetic field is consistent with the out-of-plane precessional mode, as confirmed by micromagnetic simulations. The dynamics are asymmetric with respect to the inversion of the field, which is highly unusual for magnetic phenomena not involving exchange bias. Micromagnetic simulations indicate that the asymmetry is likely caused by a combination of the Oersted field generated by the current and sample shape imperfections.

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  • Received 23 April 2009

DOI:https://doi.org/10.1103/PhysRevB.80.104408

©2009 American Physical Society

Authors & Affiliations

Weng Lee Lim, Andrew Higgins, and Sergei Urazhdin

  • Department of Physics, West Virginia University, Morgantown, West Virginia 26506, USA

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Issue

Vol. 80, Iss. 10 — 1 September 2009

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