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Thermal generation of droplet soliton in chiral magnet

Thermal generation of droplet soliton in chiral magnet

Title: Thermal generation of droplet soliton in chiral magnet
Author: Kuchkin, Vladyslav   orcid.org/0000-0002-5360-0611
Bessarab, Pavel   orcid.org/0000-0003-3351-7172
Kiselev, Nikolai S.
Date: 2022-05-02
Language: English
Scope: 184403
University/Institute: Háskóli Íslands
University of Iceland
School: Verkfræði- og náttúruvísindasvið (HÍ)
School of Engineering and Natural Sciences (UI)
Department: Raunvísindastofnun (HÍ)
Science Institute (UI)
Series: Physical Review B;105(18)
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.105.184403
Subject: Dzyaloshinskii-Moriya interaction; Entropy; Ferromagnetism; Micromagnetism; Skyrmions; Spin dynamics; Spin texture
URI: https://hdl.handle.net/20.500.11815/3995

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Controlled creation of localized magnetic textures beyond conventional π-skyrmions is an important problem in the field of magnetism. Here, by means of spin dynamics simulations, Monte Carlo simulations, and harmonic transition state theory we demonstrate that an elementary chiral magnetic soliton with zero topological charge—the chiral droplet—can be created by thermal fluctuations in the presence of the tilted magnetic field. The proposed protocol relies on an unusual kinetics combining the effects of the entropic stabilization and low-energy barrier for the nucleation of a topologically trivial state. Following this protocol by varying temperature and the tilt of the external magnetic field, one can selectively generate chiral droplets or π-skyrmions in a single system. The coexistence of two distinct magnetic solitons establishes a basis for a rich magnetization dynamics and opens up the possibility for the construction of more complex magnetic textures such as skyrmion bags and skyrmions with chiral kinks.

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