Magnon dispersion shift in the induced ferromagnetic phase of noncentrosymmetric MnSi

Sato, Taku; Okuyama, Daisuke; Hong, Tao; Kikkawa, Akiko; Taguchi, Y.; Arima, T.; Tokura, Y.

doi:10.1103/physrevb.94.144420

Cited by 49 publications

(32 citation statements)

References 36 publications

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“…It is characterized by a relaxation rate λ Z proportional to the temperature, i.e. Neutron scattering measurements give c ⊥ = 0.11 (1) × 10 −12 m 4 /s 2 at 25-26 K [36,37]. Hence, as expected, approaching T c from below a weak softening of c ⊥ occurs.…”

Section: Description Of M(t)mentioning

confidence: 58%

Dual nature of magnetism in MnSi

Yaouanc

Réotier

Roessli

et al. 2020

Phys. Rev. Research

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The temperature dependence of the manganese magnetic moment and the spin-lattice relaxation rate measured by the muon spin relaxation technique in the magnetically ordered phase of the chiral intermetallic cubic MnSi system are both explained in terms of helimagnon excitations of a localized spin model. The two free parameters characterizing the helimagnon dispersion relation are determined. A combined analysis of the two data sets cannot be achieved using the self-consistent renormalization theory of spin fluctuations which assumes the magnetism of MnSi to arise uniquely from electronic bands. As a result of this work, MnSi is proposed to be a dual electronic system composed of localized and itinerant magnetic electrons. Finally we note that the analysis framework can be applied to other helimagnets such as the magnetoelectric compound Cu2OSeO3.

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Section: Description Of M(t)mentioning

confidence: 58%

Dual nature of magnetism in MnSi

Yaouanc

Réotier

Roessli

et al. 2020

Phys. Rev. Research

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show abstract

“…Furthermore, it was also predicted that in systems with bulk DMI a frequency difference could be observed in the backward-volume geometry [91,96], that is, with the magnetization and wave vector parallel to each other and along the plane of the film. This effect has been measured in a few chiral lattice magnets [69,[102][103][104][105]. Beyond the study of spin waves in field-polarized states, spin excitations in non-uniform magnetic textures, such as helical, conical, and skyrmion phases, have also been reported [106][107][108][109][110][111].…”

Section: Introductionmentioning

confidence: 95%

Spin Waves in Thin Films and Magnonic Crystals with Dzyaloshinskii–Moriya Interactions

Gallardo¹,

Cortés‐Ortuño²,

Troncoso³

et al. 2019

Three-Dimensional Magnonics

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“…Previous neutron scattering studies provided basic evidence for non-reciprocal spin waves in MnSi. Sato et al [9] and Grigoriev et al [10] investigated the dynamics of spin waves in the field-polarized state where a large Figure 1. Inelastic scattering processes between a neutron and a left-handed conical magnetic helix in the two spin-flip scattering channels SF(+−) and SF(−+).…”

mentioning

confidence: 99%

Polarized inelastic neutron scattering of nonreciprocal spin waves in MnSi

et al. 2019

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We report spin-polarized inelastic neutron scattering of the dynamical structure factor of the conical magnetic helix in the cubic chiral magnet MnSi. We find that the spectral weight of spinflip scattering processes is concentrated on single branches for wavevector transfer parallel to the helix axis as inferred from well-defined peaks in the neutron spectra. In contrast, for wavevector transfers perpendicular to the helix the spectral weight is distributed among different branches of the magnon band structure as reflected in broader features of the spectra. Taking into account the effects of instrumental resolution, our experimental results are in excellent quantitative agreement with parameter-free theoretical predictions. Whereas the dispersion of the spin waves in MnSi appears to be approximately reciprocal at low energies and small applied fields, the associated spinresolved spectral weight displays a pronounced non-reciprocity that implies a distinct non-reciprocal response in the limit of vanishing uniform magnetization at zero magnetic field. This is a pre-print of our paper [1] at http://dx.

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Magnon dispersion shift in the induced ferromagnetic phase of noncentrosymmetric MnSi

Cited by 49 publications

References 36 publications

Dual nature of magnetism in MnSi

Dual nature of magnetism in MnSi

Spin Waves in Thin Films and Magnonic Crystals with Dzyaloshinskii–Moriya Interactions

Polarized inelastic neutron scattering of nonreciprocal spin waves in MnSi

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