Physics – Condensed Matter – Materials Science
Scientific paper
2007-05-25
Physics
Condensed Matter
Materials Science
27 pages, 5 figures, paper submitted to Physical Review B
Scientific paper
10.1103/PhysRevB.76.144410
It was shown by micromagnetic simulation that a current-driven in-plane magnetized magnetic nano-contact, besides a quasi-linear propagating ("Slonczewski") spin wave mode, can also support a nonlinear self-localized spin wave "bullet" mode that exists in a much wider range of bias currents. The frequency of the "bullet" mode lies below the spectrum of linear propagating spin waves, which makes this mode evanescent and determines its spatial localization. The threshold current for the excitation of the self-localized "bullet" is substantially lower than for the linear propagating mode, but finite-amplitude initial perturbations of magnetization are necessary to generate a "bullet" in our numerical simulations, where thermal fluctuations are neglected. Consequently, in these simulations the hysteretic switching between the propagating and localized spin wave modes is found when the bias current is varied.
Azzerboni Bruno
Consolo Giancarlo
Gerhart Grant
Melkov G. A.
Slavin Andrei N.
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