Topological magnetization jumps in a confined chiral soliton lattice

Kishine, Jun‐ichiro; Bostrem, I. G.; Овчинников, А. С.; Sinitsyn, Vl. E.

doi:10.1103/physrevb.89.014419

Cited by 55 publications

(63 citation statements)

References 26 publications

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“…Contrary to the expected analogy to the MnSi films, helicoidal states with integer turns seems to be energetically favored in our FeGe thin films, and the transformation between these integer-turn states is realized through an incommensurate state, whose helicoidal period is observed to continuously change with variation of H in . In accordance with remarkable differences observed in magnetic properties between MnSi and FeGe, e.g., saturated moment, helical period, and so on [37], our measurements show that the magnetic boundary conditions that control the helicoidal order in thin films are also different [38,39]. We thus propose that there may exist a periodic boundary condition, which can show up in a finite size system, so as to stabilize helicoidal states with integer periods in FeGe thin films.…”

Section: Resultssupporting

confidence: 87%

Direct observation of anisotropic magnetic field response of the spin helix in FeGe thin films

et al. 2016

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We report the observation by small-angle neutron scattering (SANS) of a magnetic helical structure confined in a thin film of the chiral lattice magnet FeGe. Twofold magnetic Bragg spots appearing below the magnetic transition temperature indicate the formation of a spin helix with a single propagation vector q aligned perpendicular to the film plane. Due to magnetic anisotropy, the direction of q is unaffected by an external magnetic field H. Instead we observe anisotropic deformations of the spin helix with respect to the H direction. In the configuration with H ⊥ q, the helical pitch exhibits hysteretic elongation with H, while the system tends to maintain an integer number of spiral turns within the film thickness by continuously pushing out one turn. For H q, the helix is smoothly distorted to a conical structure with minimal change in the magnetic period. The direct measurement of q by SANS establishes a correspondence between helix deformation and macroscopic features observed in magnetization and magnetoresistivity.

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Section: Resultssupporting

confidence: 87%

Direct observation of anisotropic magnetic field response of the spin helix in FeGe thin films

et al. 2016

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“…In recent theoretical studies [7,[16][17][18][19], magnetic properties of CrNb 3 S 6 have been studied with a onedimensional (1d) continuum model, which is called chiral sine-Gordon model. The analysis of this model has revealed characteristic magnetization curves, which have been observed in experiments on CrNb 3 S 6 [9,10,[20][21][22] and YbNi 3 Al 9 [13][14][15].…”

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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“…В недавних работах [10,11] сообщалось об обнаружении стохастических скачков размагничивания в хиральном молекулярном магнетике, где они отвечают нелинейным трансформациям внут-ренней структуры спиновых солитонов. Примеры воз-можного теоретического моделирования таких событий представлены в [12]. Аналогичные экспериментальные результаты были получены позднее для хирального гелимагнетика Cr 1/3 NbS 2 , в котором дискретность из-менения намагниченности была вызвана образованием спин-солитонных решеток [13].…”

Section: Introductionunclassified

Дискретный энергетический спектр нелинейных спиновых ансамблей в ферримагнетике K-=SUB=-0.4-=/SUB=-[Cr(CN)-=SUB=-6-=/SUB=-][Mn(R/S)-pn](R/S)-pnH-=SUB=-0.6-=/SUB=-

Таланцев¹,

Kirman²,

Моргунов³

2017

Физика Твердого Тела

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Обнаружены серии спонтанных скачков намагниченности на фоне непрерывной релаксации магнитного момента молекулярного ферримагнетика в постоянном магнитном поле. Статистическая обработка массива данных демонстрирует наличие, как минимум, двух мод в распределении скачков перемагничивания по их амплитуде. Количество мод в распределении зависит от величины магнитного поля и температуры, характеризует дискретный энергетический спектр нелинейных спиновых ансамблей, возникающих при низких температурах. Непрерывная компонента магнитной релаксации в области 20-50 K отвечает движению коллективов доменных стенок, а в области 2-10 K --- релаксационным процессам в спин-солитонной решетке. Работа выполнена при финансовой поддержке гранта РФФИ N 15-02-05149. DOI: 10.21883/FTT.2017.01.43952.221

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Topological magnetization jumps in a confined chiral soliton lattice

Cited by 55 publications

References 26 publications

Direct observation of anisotropic magnetic field response of the spin helix in FeGe thin films

Direct observation of anisotropic magnetic field response of the spin helix in FeGe thin films

Finite-Temperature Properties of Three-Dimensional Chiral Helimagnets

Дискретный энергетический спектр нелинейных спиновых ансамблей в ферримагнетике K-=SUB=-0.4-=/SUB=-[Cr(CN)-=SUB=-6-=/SUB=-][Mn(R/S)-pn](R/S)-pnH-=SUB=-0.6-=/SUB=-

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