Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/101689
Title: Theory of standing spin waves in a finite-size chiral spin soliton lattice
Authors: Kishine, J.
Sinitsyn, Vl. E.
Bostrem, I. G.
Proskurin, I.
Goncalves, F. J. T.
Togawa, Y.
Ovchinnikov, A. S.
Issue Date: 2019
Publisher: American Physical Society
Citation: Theory of standing spin waves in a finite-size chiral spin soliton lattice / J. Kishine, Vl. E. Sinitsyn, I. G. Bostrem, et al. — DOI 10.1103/PhysRevB.100.024411 // Physical Review B. — 2019. — Vol. 100. — Iss. 2. — 024411.
Abstract: We present a theory of standing spin waves (SSW) in a monoaxial chiral helimagnet. Motivated by experimental findings on the magnetic-field dependence of the resonance frequency in thin films of CrNb3S6 [Goncalves, Phys. Rev. B 95, 104415 (2017)10.1103/PhysRevB.95.104415], we examine the SSW over a chiral soliton lattice (CSL) excited by an ac magnetic field applied parallel and perpendicular to the chiral axis. For this purpose, we generalize Kittel-Pincus theories of the SSW in ferromagnetic thin films to the case of a noncollinear helimagnet with the surface end spins, which are softly pinned by an anisotropy field. Consequently, we found that there appear two types of modes. One is a Pincus mode that is composed of a long-period Bloch wave and a short-period ripple originated from the periodic structure of the CSL. Another is a short-period Kittel ripple excited by space-periodic perturbation, which exists only in the case in which the ac field is applied perpendicular the chiral axis. We demonstrate that the existence of the Pincus mode and the Kittel ripple is consistent with the experimentally found double resonance profile. © 2019 American Physical Society.
Keywords: CHROMIUM COMPOUNDS
CRYSTAL LATTICES
FERROMAGNETIC MATERIALS
MAGNETIC FIELDS
NIOBIUM COMPOUNDS
SOLITONS
SPIN WAVES
THIN FILMS
AC MAGNETIC FIELDS
ANISOTROPY FIELD
DOUBLE RESONANCE
FERROMAGNETIC THIN FILMS
MAGNETIC FIELD DEPENDENCES
PERIODIC PERTURBATION
RESONANCE FREQUENCIES
STANDING SPIN WAVES
LATTICE THEORY
URI: http://hdl.handle.net/10995/101689
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85073654469
PURE ID: 10308413
ISSN: 24699950
DOI: 10.1103/PhysRevB.100.024411
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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