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Non-stationary excitation of two localized spin-wave modes in a nano-contact spin torque oscillator

Journal article
Authors G. Consolo
G. Finocchio
G. Siracusano
S. Bonetti
A. Eklund
Johan Åkerman
B. Azzerboni
Published in Journal of Applied Physics
Volume 114
Issue 15
ISSN 0021-8979
Publication year 2013
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1063/1.4825065
Keywords POLARIZED CURRENT, HILBERT SPECTRUM, DRIVEN
Subject categories Physical Sciences

Abstract

We measure and simulate micromagnetically a framework based upon a nano-contact spin torque oscillator where two distinct localized evanescent spin-wave modes can be detected. The resulting frequency spectrum is composed by two peaks, corresponding to the excited modes, which lie below the ferromagnetic resonance frequency, and a low-frequency tail, which we attribute to the non-stationary switching between these modes. By using Fourier, wavelet, and Hilbert-Huang transforms, we investigate the properties of these modes in time and spatial domains, together with their spatial distribution. The existence of an additional localized mode (which was neither predicted by theory nor by previous numerical and experimental findings) has to be attributed to the large influence of the current-induced Oersted field strength which, in the present setup, is of the same order of magnitude as the external field. As a further consequence, the excited spin-waves, contrarily to what usually assumed, do not possess cylindrical symmetry: the Oersted field induces these modes to be excited at the two opposite sides of the region beneath the nano-contact. (C) 2013 AIP Publishing LLC.

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