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

Stefano Bonetti, Vasil Tiberkevich, Giancarlo Consolo, Giovanni Finocchio, Pranaba Muduli, Fred Mancoff, Andrei Slavin, and Johan Åkerman

Phys. Rev. Lett. 105, 217204 – Published 17 November 2010

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.

Received 17 September 2009

DOI:https://doi.org/10.1103/PhysRevLett.105.217204

Authors & Affiliations

Stefano Bonetti^1,*, Vasil Tiberkevich², Giancarlo Consolo^3,4, Giovanni Finocchio⁴, Pranaba Muduli⁵, Fred Mancoff⁶, Andrei Slavin², and Johan Åkerman^1,5

¹Materials Physics, Royal Institute of Technology, Electrum 229, 164 40 Kista, Sweden
²Department of Physics, Oakland University, Rochester, Michigan 48309, USA
³Department of Physics and CNISM, University of Ferrara, Ferrara, Italy
⁴Department of Matter Physics and Electronic Engineering, University of Messina, Messina, Italy
⁵Department of Physics, University of Gothenburg, Gothenburg, Sweden
⁶Everspin Technologies, Inc., 1300 N. Alma School Road, Chandler Arizona, USA

^*bonetti@kth.se

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Vol. 105, Iss. 21 — 19 November 2010

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