Anisotropy of spin waves in the field-polarized phase of Fe-doped MnSi
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866917431663919104 |
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| author | Khoroshiy, I. N. Podlesnyak, A. Menzel, D. Rahn, M. C. Inosov, D. S. Sukhanov, A. S. Nikitin, S. E. |
| author_facet | Khoroshiy, I. N. Podlesnyak, A. Menzel, D. Rahn, M. C. Inosov, D. S. Sukhanov, A. S. Nikitin, S. E. |
| contents | Chiral magnetic textures, such as skyrmions, are of great interest to the condensed matter community due to their novel transport properties. The stabilization of topologically non-trivial magnetic phases, like the skyrmion lattice in MnSi, is governed by underlying magnetic interactions which can be probed via measurements of spin-wave excitations. Here, we report high-resolution inelastic neutron scattering (INS) measurements of the spin waves in Fe-doped Mn$_{0.9}$Fe$_{0.1}$Si deep within its field-polarized ferromagnetic state. We observe non-reciprocal spin waves with a parabolic dispersion that shifts linearly with magnetic field. Crucially, the spin-wave stiffness is highly anisotropic, with values of 14.7 meV $\rm{\mathring{A}}$$^2$ parallel to the applied field and 7.6 meV $\rm{\mathring{A}}$$^2$ perpendicular to it. This pronounced anisotropy in a cubic material is inconsistent with standard theoretical models for MnSi and indicates a necessity to revise our theoretical understanding. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_21985 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Anisotropy of spin waves in the field-polarized phase of Fe-doped MnSi Khoroshiy, I. N. Podlesnyak, A. Menzel, D. Rahn, M. C. Inosov, D. S. Sukhanov, A. S. Nikitin, S. E. Strongly Correlated Electrons Chiral magnetic textures, such as skyrmions, are of great interest to the condensed matter community due to their novel transport properties. The stabilization of topologically non-trivial magnetic phases, like the skyrmion lattice in MnSi, is governed by underlying magnetic interactions which can be probed via measurements of spin-wave excitations. Here, we report high-resolution inelastic neutron scattering (INS) measurements of the spin waves in Fe-doped Mn$_{0.9}$Fe$_{0.1}$Si deep within its field-polarized ferromagnetic state. We observe non-reciprocal spin waves with a parabolic dispersion that shifts linearly with magnetic field. Crucially, the spin-wave stiffness is highly anisotropic, with values of 14.7 meV $\rm{\mathring{A}}$$^2$ parallel to the applied field and 7.6 meV $\rm{\mathring{A}}$$^2$ perpendicular to it. This pronounced anisotropy in a cubic material is inconsistent with standard theoretical models for MnSi and indicates a necessity to revise our theoretical understanding. |
| title | Anisotropy of spin waves in the field-polarized phase of Fe-doped MnSi |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2604.21985 |