Spin-wave stiffness in the Dzyaloshinskii-Moriya helimagnets 
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Grigoriev, S. V.; Altynbaev, E. V.; Siegfried, S.-A.; Pschenichnyi, K. A.; Menzel, D.; Heinemann, A.; Chaboussant, Grégory

doi:10.1103/physrevb.97.024409

Cited by 15 publications

(7 citation statements)

References 28 publications

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“…We found a remarkable electrostatic analogy in this problem: the distortion of the spiral ordering by a single defect is given by a Poisson equation for an electric dipole. The electrostatic analogy allowed us to find that a small concentration c of impurities leads to a correction to the spiral vector proportional to c as it was recently observed 12,13 in Mn 1−x Fe x Si at small x.…”

Section: Introductionmentioning

confidence: 66%

“…Such a linear in dopant concentration correction to the spiral vector was observed recently experimentally in Mn 1−x Fe x Si. 12,13 It should be pointed out that solution (27) lies in contradiction with the requirement |ρ R | √ S at large enough R. It happens because the finite concentration of defects changes the spiral vector. As a result, orientation of some spins differs significantly from their orientation in the pure system.…”

Section: A Defects In Dmi Onlymentioning

confidence: 96%

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Cubic B20 helimagnets with quenched disorder in magnetic field

Utesov

Syromyatnikov

2019

Phys. Rev. B

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We theoretically address the problem of cubic B20 helimagnets with small concentration c 1 of defect bonds in external magnetic field H, which is relevant to mixed B20 compounds at small dopant concentrations. We assume that Dzyaloshinskii-Moriya interaction and the exchange coupling constant are changed on imperfect bonds which leads to distortion of the conical spiral ordering. In one-impurity problem, we find that the distortion of the spiral pitch is long-ranged and it is governed by the Poisson equation for an electric dipole. The variation of the cone angle is described by the screened Poisson equation for two electric charges with the screening length being of the order of the spiral period. We calculate corrections to the spiral vector and to the cone angle at finite c. The correction to the spiral vector is shown to be independent of H. We demonstrate that diffuse neutron scattering caused by disorder appears in the elastic cross section as power-law decaying tails centered at magnetic Bragg peaks.

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Section: Introductionmentioning

confidence: 66%

Section: A Defects In Dmi Onlymentioning

confidence: 96%

Cubic B20 helimagnets with quenched disorder in magnetic field

Utesov

Syromyatnikov

2019

Phys. Rev. B

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“…как отмечалось ранее [10] возникает геликоидальный ближний порядок с флуктуациями начальной фазы φ спиновой спирали. Концентрационная зависимость температуры T S , при которой локальная намагниченность (17) исчезает, приведена и сопоставлена с экспериментальными данными [5] на рис. 4.…”

Section: модуль локальной намагниченности определяется уравнениемunclassified

“…Киральные ферромагнитные геликоиды MnSi и Fe x Mn 1−x Si относятся к структурному типу B20 с пространственной группой P2 1 3, для которой характерно отсутствие центра инверсии [1,2]. Вследствие такой симметрии возникает антисимметричный релятивистский обмен Дзялошинского−Мории (ДМ) [3,4], который совместно с неоднородным обменным взаимодействием приводят к возникновению спиновой спирали с большим (порядка 100−1000 ангстрем) магнитным периодом [5]. Согласно экспериментальным исследованиям [6], при магнитных фазовых переходах в этих магнетиках, сначала исчезает дальний геликоидальный ферромагнитный порядок (в точке T C ), при этом возникает ближний геликоидальный порядок с флуктуациями спиновой спирали [6], и только затем, при температуре T S (> T C ) реализуется парамагнитное состояние.…”

Section: Introductionunclassified

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Исследование квантовых флуктуаций в Fe-=SUB=-x-=/SUB=-Mn-=SUB=-1-x-=/SUB=-Si с учетом LDA + U + SO-расчетов электронной структуры

Повзнер¹,

Нуретдинов²,

Волков³

2019

Физика Твердого Тела

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Quantum spin fluctuations are studied in chiral helicoidal Fe_ x Mn_1 – _ x Si ferromagnets on the basis of the direct calculations of the electronic structure. The disappearance of the helicoidal long-range order is shown to be accompanied by the appearance of the crossover of the thermodynamic and quantum transitions with a sharp decrease in the local magnetization and the zero fluctuation amplitude. Suppression of the local magnetization by quantum spin fluctuations leads to the concentration–temperature magnetic transition with the disappearance of the helicoidal short-range order. The calculations of the magnetization of the Fe_ x Mn_1 – _ x Si compositions show that at 0.12 < x < 0.20 the magnetic state in the thermodynamic limit is characterized by the short-range (not long-range) helicoidal order.

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Tuning the Disconnected Magnetic Phase by Regulating the Lattice Distortion in FeSi1−xGex Alloys

Huang

Chen

et al. 2022

J. Electron. Mater.

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Spin-wave stiffness in the Dzyaloshinskii-Moriya helimagnets Mn1−xFexSi

Cited by 15 publications

References 28 publications

Cubic B20 helimagnets with quenched disorder in magnetic field

Cubic B20 helimagnets with quenched disorder in magnetic field

Исследование квантовых флуктуаций в Fe-=SUB=-x-=/SUB=-Mn-=SUB=-1-x-=/SUB=-Si с учетом LDA + U + SO-расчетов электронной структуры

Tuning the Disconnected Magnetic Phase by Regulating the Lattice Distortion in FeSi1−xGex Alloys

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