Confined dipole and exchange spin waves in a bulk chiral magnet with Dzyaloshinskii-Moriya interaction

Che, Ping; Stasinopoulos, Ioannis; Mucchietto, Andrea; Li, Jianing; Berger, H.; Bauer, Andreas; Pfleiderer, C.; Grundler, D.

doi:10.1103/physrevresearch.3.033104

Cited by 11 publications

(5 citation statements)

References 45 publications

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“…The phase patterns substantiate a curvature-induced magnetochiral effect which was predicted first for circular NTs and then for hexagonal cross-sections [24]. We find an unusual nature of confined modes which so far was restricted to magnets with Dzyaloshinskii-Moriya interaction [29,30] and puts a new spin on 3D nanomagnonics.…”

Section: Introductionsupporting

confidence: 74%

Confined spin waves in magnetochiral nanotubes with axial and circumferential magnetization

Giordano

Hamdi

Mucchietto

et al. 2023

Phys. Rev. Materials

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We report experimental studies of spin-wave excitations in individual 22 nm thick Ni80Fe20 nanotubes with diameters of about 150 nm. We apply Brillouin light-scattering (BLS) spectroscopy under microwave irradiation and resolve sets of discrete resonances in the center of nanotubes ranging from 2.5 to 12.5 GHz. Comparing to a recent theoretical work and micromagnetic simulations, we identify different characteristic eigenmodes depending on the axial, mixed or vortex configuration. The mixed and vortex states give rise to modes with helical phase profiles substantiating an unusual nature of confined modes attributed to non-reciprocal spin waves. Our findings provide microscopic insight into realistic tubular spin-wave nanocavities and magnetochiral effects for 3D nanomagnonics.

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Section: Introductionsupporting

confidence: 74%

Confined spin waves in magnetochiral nanotubes with axial and circumferential magnetization

Giordano

Hamdi

Mucchietto

et al. 2023

Phys. Rev. Materials

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show abstract

“…The phase patterns substantiate a curvature-induced magnetochiral effect which was predicted first for circular NTs and then for hexagonal cross-sections [25]. We find an unusual nature of confined modes which so far was restricted to magnets with Dzyaloshinskii-Moriya interaction [29,30] and puts a new spin on 3D nanomagnonics.…”

supporting

confidence: 74%

Magnetochiral Properties of Spin Waves Existing in Nanotubes with Axial and Circumferential Magnetization

Giordano¹,

Hamdi²,

Mucchietto³

et al. 2022

Preprint

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We report experimental studies of spin-wave excitations in individual 22 nm thick Ni80Fe20 nanotubes with diameters of about 150 nm by means of Brillouin light-scattering (BLS) spectroscopy. Irradiated by microwaves we resolve sets of discrete resonances in the center of nanotubes ranging from 2.5 to 12.5 GHz. Comparing to a recent theoretical work and micromagnetic simulations, we identify different characteristic eigenmodes depending on the axial, mixed or vortex configuration. The mixed and vortex states give rise to modes with helical phase profiles substantiating an unusual nature of modes attributed to non-reciprocal spin waves. Our findings provide microscopic insight into tubular spin-wave nanocavities and magnetochiral effects for 3D nanomagnonics.

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“…Whilst the excitations of the chiral (DMI-based) helimagnets were broadly discussed in recent studies [11][12][13][14], the magnon spectrum of the centrosymmetric (achiral) spin-spiral materials remains less studied [15][16][17]. Chiral helimagnets usually feature long spiral periods (much greater than the unit-cell parameter), which is dictated by the smallness of the DMI as compared to the isotropic Heisenberg exchange.…”

Section: Introduction a General Motivationmentioning

confidence: 99%

Frustration model and spin excitations in the helimagnet FeP

et al. 2022

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The metallic compound FeP belongs to the class of materials that feature a complex noncollinear spin order driven by magnetic frustration. While its double-helix magnetic structure with a period λ s ≈ 5c, where c is the lattice constant, was previously well determined, the relevant spin-spin interactions that lead to that ground state remain unknown. By performing extensive inelastic neutron scattering measurements, we obtained the spin-excitation spectra in a large part of the momentum-energy space. The spectra show that the magnons are gapped with a gap energy of ∼5 meV. Despite the 3D crystal structure, the magnon modes display strongly anisotropic dispersions, revealing a quasi-one-dimensional character of the magnetic interactions in FeP. The physics of the material, however, is not determined by the dominating exchange, which is ferromagnetic. Instead, the weaker two-dimensional antiferromagnetic interactions between the rigid ferromagnetic spin chains drive the magnetic frustration. Using linear spin-wave theory, we were able to construct an effective Heisenberg Hamiltonian with an anisotropy term capable of reproducing the observed spectra. This enabled us to quantify the exchange interactions in FeP and determine the mechanism of its magnetic frustration.

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Confined dipole and exchange spin waves in a bulk chiral magnet with Dzyaloshinskii-Moriya interaction

Cited by 11 publications

References 45 publications

Confined spin waves in magnetochiral nanotubes with axial and circumferential magnetization

Confined spin waves in magnetochiral nanotubes with axial and circumferential magnetization

Magnetochiral Properties of Spin Waves Existing in Nanotubes with Axial and Circumferential Magnetization

Frustration model and spin excitations in the helimagnet FeP

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