Fizika Nizkikh Temperatur: Volume 44, Number 7 (July 2018), p. 775-793    ( to contents , go back )

Bullets and droplets: Two-dimensional spin-wave solitons in modern magnonics (Review Article)

O.R. Sulymenko and O.V. Prokopenko

Taras Shevchenko National University of Kyiv, Kyiv 01601, Ukraine

V.S. Tyberkevych and A.N. Slavin

Oakland University, Rochester MI 48309, USA

A.A. Serga

Technische Universität Kaiserslautern, Kaiserslautern 67663, Germany

Received February 14, 2018


In this review we consider theoretical and experimental results related to the properties of two-dimensional spin-wave (SW) solitons, so-called SW bullets and SW droplets. Such nonlinear self-localized SW modes possess very interesting physical properties, and could have practical applications in modern and future magnonics and spintronics. The experimental and theoretical results presented in this review have undeniably proven the existence of SW bullets in magnetic films and confined magnetic nanostructures (magnetic nanocontacts), and have elucidated the essential distinctions between the properties of the one-dimensional nonlinear SW solitons, two-dimensional nonlinear SW bullets and linear spin wave packets, as well as the possibility of self-generation, parametrical excitation, and phase-conjugation of the SW bullets, similar to the case of the conventional linear spin waves. Also, in this review we presented experimental results demonstrating the nucleation, dynamics, and annihilation of two-dimensional strongly nonlinear SW “droplets” in spin-torque-driven magnetic nanocontacts. The properties of these exotic nonlinear objects are analyzed using recently developed theoretical models and illustrated by micromagnetic numerical simulations.

PACS: 75.30.Ds Spin waves;
PACS: 85.75.–d Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields;
PACS: 72.25.–b Spin-polarized transport;
PACS: 73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects).

Key words: magnetic soliton, spin-wave bullet, spin-wave droplet.

Published online: May 28, 2018

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