Magnetism, spintronics

Nonlinear dynamics of a semi-infinite ferromagnet with the helicoidal structure

V. V. Kiselev^ab, A. A. Raskovalov<sup>abc

a</sup> Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Russia
^b Ural Federal University named after the First President of Russia B. N. Yeltsin, Yekaterinburg, Russia
^c Skolkovo Institute of Science and Technology, Moscow, Russia

Abstract: For easy-plane ferromagnet without inversion center new types of solitons, built into the helicoidal structure of the semi-infinite sample, are found and analyzed, based on the Landau–Lifshitz model. The mixed boundary conditions are used. Their limiting cases correspond to free or completely pinned spins at the boundary of the sample. All chiral solitons are travelling. It is shown, that their cores near the surface of the sample are dramatically deformed. This process is accompanied by remagnetization of the medium. The dynamical properties of the chiral solitons and peculiarities of their elastic reflection from the edge of the sample are analyzed, depending on the character of pinning of the edge spins.

Keywords: solitons, Landau–Lifshitz equation, turning wave, easy-plane anisotropy, chiral breather.

Received: 05.04.2024
Revised: 06.09.2024
Accepted: 16.09.2024

DOI: 10.61011/FTT.2024.10.59081.150

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