title: Experimental evidence of self-localized and propagating spin wave modes in obliquely magnetized current-driven nanocontacts.
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.
authors.affiliation: Materials Physics, Royal Institute of Technology, Electrum 229, 164 40 Kista, Sweden. bonetti@kth.se
authors.forename: Stefano
authors.initials: S
authors.lastname: Bonetti
authors.forename: Vasil
authors.initials: V
authors.lastname: Tiberkevich
authors.forename: Giancarlo
authors.initials: G
authors.lastname: Consolo
authors.forename: Giovanni
authors.initials: G
authors.lastname: Finocchio
authors.forename: Pranaba
authors.initials: P
authors.lastname: Muduli
authors.forename: Fred
authors.initials: F
authors.lastname: Mancoff
authors.forename: Andrei
authors.initials: A
authors.lastname: Slavin
authors.forename: Johan
authors.initials: J
authors.lastname: Akerman