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Title: | Dark Discrete Breather Modes in a Monoaxial Chiral Helimagnet with Easy-plane Anisotropy |
Authors: | Bostrem, I. G. Ekomasov, E. G. Kishine, J. Ovchinnikov, A. S. Sinitsyn, V. E. |
Issue Date: | 2021 |
Publisher: | American Physical Society American Physical Society (APS) |
Citation: | Dark Discrete Breather Modes in a Monoaxial Chiral Helimagnet with Easy-plane Anisotropy / I. G. Bostrem, E. G. Ekomasov, J. Kishine et al. // Physical Review B. — 2021. — Vol. 104. — Iss. 21. — 214420. |
Abstract: | Nonlinearity and discreteness are two pivotal factors for an emergence of discrete breather excitations in various media. We argue that these requirements are met in the forced ferromagnetic phase of the monoaxial chiral helimagnet CrNb3S6 due to the specific domain structure of the compound. The stationary, time-periodic breather modes appear as the discrete breather lattice solutions whose period mismatches with a system size. Thanks to easy-plane single-ion anisotropy intrinsic to CrNb3S6, these modes are of the dark type with frequencies lying within the linear spin-wave band, close to its bottom edge. They represent cnoidal states of magnetization, similar to the well-known soliton lattice ground state, with differing but limited number of embedded 2π kinks. The linear stability of these dark breather modes is verified by means of Floquet analysis. Their energy, which is controlled by two parameters, namely, the breather lattice period and amplitude, falls off linearly with a growth of the kink number. These results may pave a path to design spintronic resonators on the base of chiral helimagnets. © 2021 American Physical Society. |
Keywords: | ANISOTROPY GROUND STATE NIOBIUM COMPOUNDS SPIN WAVES SULFUR COMPOUNDS DISCRETE BREATHER DOMAIN STRUCTURE EASY PLANE EASY-PLANE ANISOTROPY FERROMAGNETIC PHASIS LINEAR STABILITY SINGLE ION ANISOTROPY SOLITON LATTICE SYSTEM SIZE WAVEBANDS CHROMIUM COMPOUNDS |
URI: | http://elar.urfu.ru/handle/10995/111432 |
Access: | info:eu-repo/semantics/openAccess |
RSCI ID: | 47547626 |
SCOPUS ID: | 85122023731 |
WOS ID: | 000753810400006 |
PURE ID: | 29207430 |
ISSN: | 2469-9950 |
DOI: | 10.1103/PhysRevB.104.214420 |
metadata.dc.description.sponsorship: | This work was supported by the Act of the Government of the Russian Federation (Contract No. 02.A03.21.0006). I.G.B., E.G.E., and V.E.S. acknowledge financial support by the Russian Foundation for Basic Research (RFBR), Grant No. 20-02-00213. A.S.O. thanks the Russian Foundation for Basic Research (RFBR), Grant No. 20-52-50005, and the Ministry of Science and Higher Education of the Russian Federation, Project No. FEUZ-2020-0054. J.K. acknowledges financial support by JSPS KAKENHI Grant No. 17H02923. |
Appears in Collections: | Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC |
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File | Description | Size | Format | |
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2-s2.0-85122023731.pdf | 2,62 MB | Adobe PDF | View/Open |
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