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Experimental Evidence of Self-Localized and Propagating Spin Wave Modes in Obliquely Magnetized Current-driven Nanocontacts

Journal article
Authors Stefano Bonetti
Vasil Tiberkevich
Giancarlo Consolo
Giovanni Finocchio
Pranaba Muduli Kishor
Fred Mancoff
Andrei Slavin
Johan Åkerman
Published in Physical Review Letters
Volume 105
Issue 21
Pages 217204, 4 pages
ISSN 0031-9007
Publication year 2010
Published at Department of Physics (GU)
Pages 217204, 4 pages
Language en
Links prl.aps.org/abstract/PRL/v105/i21/e...
Keywords spinntronik, magnetism
Subject categories Magnetism

Abstract

Through detailed experimental studies of the angular dependence of spin wave excitations in nanocontact-based spin-torque oscillators, we demonstrate that two distinct spin wave modes can be excited, with different frequency, threshold currents, and frequency tunability. Using analytical theory and micromagnetic simulations we identify one mode as an exchange-dominated propagating spin wave, and the other as a self-localized nonlinear spin wave bullet. Wavelet-based analysis of the simulations indicates that the apparent simultaneous excitation of both modes results from rapid mode hopping induced by the Oersted field.

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