High spin-wave asymmetry and emergence of radial standing modes in thick ferromagnetic nanotubes

Gallardo, R. A.; Alvarado-Seguel, P.; Landeros, P.

doi:10.1103/physrevb.105.104435

Cited by 10 publications

(2 citation statements)

References 84 publications

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“…In the next few decades, numerous research works are focused on the accelerating development of opto‐magnetization recording. To facilitate the potential applications in all‐optical magnetic recording, [ 7,8 ] magnetic resonance microscopy, [ 9,10 ] atom trapping, [ 11,12 ] holography [ 13 ] and manipulation of the spin wave, [ 14 ] the super‐resolved magnetization structures such as a single ellipsoidal or spherical magnetization spot, [ 15,16 ] magnetization needle, [ 17,18 ] magnetization spot arrays, [ 19,20 ] magnetization chain, [ 21,22 ] magnetic vortex core, [ 23 ] and twisted longitudinal magnetization texture [ 24 ] are garnered by tightly focusing the incident light fields tailored with amplitude, phase, and polarization modulations. The magnetization domain of these versatile magnetization structures is still inferior to the ultimate limit of

0.36 λ / N A

[ 18,25 ] (NA is the numerical aperture of the objective lens), which degrades the ultra‐high density storage.…”

Section: Introductionmentioning

confidence: 99%

5D Opto‐Magnetization Endowed by Physics‐Enhanced Deep Learning

Yan

Huang

Zhang

et al. 2023

Advanced Photonics Research

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In the era of big data, all‐optical control of the magnetization is recognized as an alternative scheme that boosts the accelerating advance of multifunctional integrated opto‐magnetization devices with high‐density capacity. The light‐induced magnetizations demonstrated so far are devoted to steering their spatial orientations and structures by engineering the complicated phase, amplitude, and polarization modulations of incident wavefronts, which, however, confront low efficiency, weak flexibility, and limited dimension. To tackle these issues efficaciously, a novel strategy is proposed to first achieve 5D opto‐magnetization composed of 3D spatial location, vectorial orientation as well as magnitude. This relies on physics‐enhanced deep learning incorporating multilayer perceptron (MLP) artificial neural network and opto‐magnetization principles. The preeminent magnetization morphology largely expedites the improvement in multi‐dimensional storage. The proposed facile approach is time‐efficient, flexible, and accurate to attain the prescribed magnetization. Moreover, the presenting findings and proposed route are not only applied for magnetization manipulation, but also applicable to the control of the structured light field.

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0.36 λ / N A

[ 18,25 ] (NA is the numerical aperture of the objective lens), which degrades the ultra‐high density storage.…”

Section: Introductionmentioning

confidence: 99%

5D Opto‐Magnetization Endowed by Physics‐Enhanced Deep Learning

Yan

Huang

Zhang

et al. 2023

Advanced Photonics Research

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“…They are extremely versatile as their properties change as a function of, both, their geometrical parameters, namely length, inner and outer radius, [10][11][12] and their axial, helical or vortex-like magnetic configuration [13,14]. A curvature-induced magnetochiral field originating from dipole-dipole interaction is expected [15] and can induce non-reciprocal spin-wave dispersion relations in case of cylindrical NTs with nanometric radii [8,14,[16][17][18][19]. Previous experimental studies based on microtubes prepared from rolled-up ferromagnetic layers [20,21] have not addressed magnetochiral effects as radii were in the micrometer regime.…”

mentioning

confidence: 99%

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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Finite-element dynamic-matrix approach for propagating spin waves: Extension to mono- and multi-layers of arbitrary spacing and thickness

et al. 2022

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In our recent work [Körber et al., AIP Adv. 11, 095006 (2021)], we presented an efficient numerical method to compute dispersions and mode profiles of spin waves in waveguides with translationally invariant equilibrium magnetization. A finite-element method (FEM) allowed to model two-dimensional waveguide cross sections of arbitrary shape but only finite size. Here, we extend our FEM propagating-wave dynamic-matrix approach from finite waveguides to the important cases of infinitely extended mono- and multi-layers of arbitrary spacing and thickness. To obtain the mode profiles and frequencies, the linearized equation of the motion of magnetization is solved as an eigenvalue problem on a one-dimensional line-trace mesh, defined along the normal direction of the layers. Being an important contribution to multi-layer systems, we introduce interlayer exchange into our FEM approach. With the calculation of dipolar fields being the main focus, we also extend the previously presented plane-wave Fredkin–Koehler method to calculate the dipolar potential of spin waves in infinite layers. The major benefit of this method is that it avoids the discretization of any non-magnetic material such as non-magnetic spacers in multilayers. Therefore, the computational effort becomes independent of the spacer thicknesses. Furthermore, it keeps the resulting eigenvalue problem sparse, which, therefore, inherits a comparably low arithmetic complexity. As a validation of our method (implemented into the open-source finite-element micromagnetic package TETRAX), we present results for various systems and compare them with theoretical predictions and with established finite-difference methods. We believe this method offers an efficient and versatile tool to calculate spin-wave dispersions in layered magnetic systems.

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High spin-wave asymmetry and emergence of radial standing modes in thick ferromagnetic nanotubes

Cited by 10 publications

References 84 publications

5D Opto‐Magnetization Endowed by Physics‐Enhanced Deep Learning

5D Opto‐Magnetization Endowed by Physics‐Enhanced Deep Learning

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

Finite-element dynamic-matrix approach for propagating spin waves: Extension to mono- and multi-layers of arbitrary spacing and thickness

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