Chiral Magnetic Soliton Lattice on a Chiral Helimagnet

Togawa, Yoshihiko; Koyama, Tsukasa; Takayanagi, Kazuo; Mori, Shigeo; Kousaka, Yusuke; Akimitsu, Jun; Nishihara, Sadafumi; Inoue, Katsuya; Овчинников, А. С.; Kishine, Jun‐ichiro

doi:10.1103/physrevlett.108.107202

Cited by 485 publications

(464 citation statements)

References 27 publications

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“…Although the present value of T C is slightly larger than typical values reported in the literature [19], it might reflect the very high quality of the crystal investigated.…”

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confidence: 52%

“…Recently, the emergence and transformation of the CSL into the forced FM state have been experimentally verified in a thin CrNb 3 S 6 single crystal by means of simultaneous real-space and k-space experiments using Lorentz transmission electron microscopy and the small-angle electron scattering method [19]. Applying a magnetic field perpendicular to the chiral c axis gives rise to the continuous growth of LðHÞ from 48 nm toward infinity (sample size) at H c , the behavior of which is well fitted by the soliton density Lð0Þ=LðHÞ based on the scenario of the CSL formation.…”

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confidence: 99%

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Interlayer Magnetoresistance due to Chiral Soliton Lattice Formation in Hexagonal Chiral MagnetCrNb3S6

et al. 2013

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We investigate the interlayer magnetoresistance (MR) along the chiral crystallographic axis in the hexagonal chiral magnet CrNb 3 S 6 . In a region below the incommensurate-commensurate phase transition between the chiral soliton lattice and the forced ferromagnetic state, a negative MR is obtained in a wide range of temperature, while a small positive MR is found very close to the Curie temperature. Normalized data of the negative MR almost falls into a single curve and is well fitted by a theoretical equation of the soliton density, meaning that the origin of the MR is ascribed to the magnetic scattering of conduction electrons by a nonlinear, periodic, and countable array of magnetic soliton kinks. , belong to chiral space groups and are frequently referred to as chiral magnets. In chiral magnets, the combined effect of the symmetric Heisenberg exchange and the antisymmetric Dzyaloshinskii-Moriya (DM) interactions caused by the relativistic spin-orbit interaction [5,6] gives rise to a nontrivial spin texture and various interesting functions unique to chiral magnets. A coupling of conduction electrons with nontrivial spin textures has recently attracted great attention because of the ability to manipulate magnetotransport properties such as the topological Hall effect [7]. One promising candidate to realize this coupling is the chiral soliton lattice (CSL), which is formed in a chiral magnet under magnetic fields perpendicular to the chiral axis. The CSL is a nonlinear array of magnetic soliton kinks. It is naturally expected that each magnetic soliton kink works as a strong scattering potential for itinerant spins. Therefore, decreasing the number of magnetic soliton kinks may reduce the magnetoresistance (MR) and thus the CSL will present a nontrivial MR.In this Letter, we report the MR along the chiral axis in a hexagonal chiral magnetic crystal of CrNb 3 S 6 . We find that the normalized data of the negative MR almost falls into a single curve, and the revealed behavior indicates that the origin of the MR can be attributed to the magnetic scattering of conduction electrons by a nonlinear, periodic, and countable array of magnetic soliton kinks. Namely, we clarify the direct correlation between the experimentally measured MR and the analytically obtained soliton density as a function of the magnetic field.CrNb 3 S 6 is a typical monoaxial chiral magnet, which belongs to the space group of P6 3 22 [8]. It has a layered hexagonal structure of 2H-type NbS 2 intercalated by Cr atoms, so often expressed as Cr 1=3 NbS 2 . The size of the unit cell is 0.57 nm in the ab plane and 1.21 nm along the c axis [9,10]. Cr atoms are in the trivalent state and have localized electrons with spins of S ¼ 3=2, whereas conduction electrons are in an unfilled hybridized band of Nb and S. As a consequence of the chiral space group, the monoaxial DM interaction is allowed along the chiral c axis in CrNb 3 S 6 , which is given in the form of ÀD Á S 1 Â S 2 between localized neighboring spins S 1 and S 2 at Cr atoms. Here, D repres...

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“…Although the present value of T C is slightly larger than typical values reported in the literature [19], it might reflect the very high quality of the crystal investigated.…”

contrasting

confidence: 52%

mentioning

confidence: 99%

Interlayer Magnetoresistance due to Chiral Soliton Lattice Formation in Hexagonal Chiral MagnetCrNb3S6

et al. 2013

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“…In this compound, magnetic moments are associated with the intercalated Cr 3+ ions between the NbS 2 -layers, each of which have magnetic moment 2.9µ B , which is nearly full moment for spin 3/2 electrons. Recently, Togawa et al directly observed the CSL structure in CrNb 3 S 6 using Lorentz transmission electron microscopy, and found that the chiral magnetic structures are very stable against crystal defects [11]. With this result, CrNb 3 S 6 is recognized as one * Electronic address: shinozaki@vortex.c.u-tokyo.ac.jp of the candidates of new magnetic devices [12].…”

Section: Introductionmentioning

confidence: 99%

Finite-Temperature Properties of Three-Dimensional Chiral Helimagnets

et al. 2016

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We study a three-dimensional (3d) classical chiral helimagnet at finite temperatures through analysis of a spin Hamiltonian, which is defined on a simple cubic lattice and consists of Heisenberg exchange, mono-axial Dzyaloshinskii-Moriya interactions and Zeeman energy due to magnetic field applied in the plane perpendicular to the helical axis. We take account of quasi-two-dimensionality of a known mono-axial chiral helimagnet CrNb3S6 and we adopt three methods: (i) a conventional mean-field (MF) analysis which we call 3dMF method, (ii) a hybrid method called 2dMC-1dMF, which is composed of a classical Monte Carlo (MC) simulation and MF approximation applied respectively to the intra-and inter-plane interactions, and (iii) a simple-MC simulation (3dMC) at zero field. Temperature dependence of magnetization calculated by the 3dMF method shows a cusp-like structure similar to that observed in experiments. In the absence of magnetic field, both 2dMC-1dMF and 3dMC yield close values of transition temperature. The 2dMC-1dMF provides a quantitative description of thermodynamic properties even under external field at an accessible numerical cost.

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“…Opposedly, in GaV 4 S 8 , the FP state is achieved by the expansion of the cycloidal pitch and the increasing anharmonicity of the modulation [49], similarly to monoaxial chiral magnets [53]. In addition, structural disorder may introduce pinning along with a spatial variation of the modulation wavelength.…”

Section: B Slow Relaxation Phenomena At the Magnetic Phase Boundariesmentioning

confidence: 99%

Relaxation dynamics of modulated magnetic phases in the skyrmion host GaV4S8 : An ac magnetic susceptibility study

et al. 2017

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We report on the slow magnetization dynamics observed upon the magnetic phase transitions of GaV 4 S 8 , a multiferroic compound featuring a long-ranged cycloidal magnetic order and a Néel-type skyrmion lattice in a relatively broad temperature range below its Curie temperature. The fundamental difference between GaV 4 S 8 and the chiral helimagnets, the prototypical skyrmion host compounds, lies within the polar symmetry of GaV 4 S 8 , promoting a cycloidal instead of a helical magnetic order and rendering the magnetic phase diagram essentially different from that in the cubic helimagnets. Our ac magnetic susceptibility study reveals slow relaxation dynamics at the field-driven phase transitions between the cycloidal, skyrmion lattice and field-polarized states. At each phase boundary, the characteristic relaxation times were found to exhibit a strong temperature dependence, starting from the minute range at low temperatures, decreasing to the micro-to millisecond range at higher temperatures.

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Chiral Magnetic Soliton Lattice on a Chiral Helimagnet

Cited by 485 publications

References 27 publications

Interlayer Magnetoresistance due to Chiral Soliton Lattice Formation in Hexagonal Chiral MagnetCrNb3S6

Interlayer Magnetoresistance due to Chiral Soliton Lattice Formation in Hexagonal Chiral MagnetCrNb3S6

Finite-Temperature Properties of Three-Dimensional Chiral Helimagnets

Relaxation dynamics of modulated magnetic phases in the skyrmion host GaV4S8 : An ac magnetic susceptibility study

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