Theory of standing spin waves in finite-size chiral spin soliton lattice

We present a theory of standing spin wave (SSW) in a monoaxial chiral helimagnet. Motivated by experimental findings on the magnetic field-dependence of the resonance frequency in thin films of Cr${}$Nb$_{3}$S${}_{6}$[Goncalves et al., Phys. Rev. B95, 104415 (2017)], 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 non-collinear helimagnet with the surface end spins which are softly pinned by an anisotropy field. Consequently, we found there appear two types of modes. One is a Pincus mode which 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 where 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 experimentally found double resonance profile.Comment: 17 pages, 14 figure

Coherent sliding dynamics and spin motive force driven by crossed magnetic fields in a chiral helimagnet

We demonstrate that the chiral soliton lattice formed from a chiral helimagnet exhibits a coherent sliding motion when a time-dependent magnetic field is applied parallel to the helical axis, in addition to a static field perpendicular to the helical axis. To describe the coherent sliding, we use the collective coordinate method and a numerical analysis. We also show that the time-dependent sliding velocity causes a time-varying Berry cap which creates a spin motive force. A salient feature of the chiral soliton lattice is the appearance of a strongly amplified spin motive force which is directly proportional to the macroscopic number of solitons (magnetic kinks). © 2012 American Physical Society

MAGNETOACOUSTIC RESONANCE IN THE SPIRAL PHASE OF MONOAXIAL CHIRAL HELIMAGNET

A magnetoacoustic resonance of the helical phase of a chiral helimagnet with hexagonal symmetry is considered. Dispersion curves of magnetoacoustic waves are calculated with an account of all the magnetoelastic constants permitted by the symmetry of the crystal

Discrete magnetic breathers in monoaxial chiral helimagnet

We analyze spatially localized breather excitations for the model of a discrete Heisenberg spin chain, which includes the antisymmetric exchange interaction and single-ion anisotropy of the easy-plane type. In a finite size chain the breather modes may be indexed by number of embedded kink-antikink pairs forming the regular breather lattice. The influence of the antisymmetric exchange on properties of the discrete breather modes is examined. © 2021 Author(s).The authors are grateful to S.V. Dmitriev for valuable discussions. This work was supported by the RFBR grant (project No. 20-02-00213), the Act of the Government of the Russian Federation (contracts No. 02.A03.21.0011 and No. 02.A03.21.0006), the Ministry of Science and Higher Education of the Russian Federation, project No. FEUZ-2020-0054

MAGNETIC PHASE TRANSITIONS AND MAGNETIC HYSTERESIS IN THE ANTIFERROMAGNETIC COMPOUNDS FE0.5TIS2−YSEY

It has been shown, that magnetoelastic interactions may be responsible for the formation of the metastable field-induced high-coercive FM state in the Ising-type antiferromagnets.Работа выполнена при поддержке гранта РФФИ 18-32-00769 мол_а и Фонда содействия развитию теоретической физики и математики BASIS 17-11-107

Durchfuehrung von Immissionsprognosen fuer Koerperschall- und Erschuetterungseinwirkungen

SIGLEAvailable from TIB Hannover: RN 6729(107) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman