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Through detailed experimental studies of the angular dependence of spin waveexcitations in nanocontact-based spin-torque oscillators, we demonstrate thattwo distinct spin wave modes can be excited, with different frequency,threshold currents and frequency tuneability. Using analytical theory andmicromagnetic simulations we identify one mode as an exchange-dominatedpropagating spin wave, and the other as a self-localized nonlinear spin wavebullet. Wavelet-based analysis of the simulations indicates that the apparentsimultaneous excitation of both modes results from rapid mode hopping inducedby the Oersted field.

Experimental evidence of self-localized and propagating spin wave modes in obliquely magnetized current-driven nanocontacts