Width dependent transition of quantized spin-wave modes in Ni80Fe20 square nanorings

Banerjee, Chandrima; Saha, Susmita; Barman, Saswati; Rousseau, Olivier; Otani, Y.; Barman, Anjan

doi:10.1063/1.4900616

Cited by 13 publications

(11 citation statements)

References 31 publications

(58 reference statements)

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“…To underpin the origin of the discrepancies between the experimental and the simulated spectra for the Di-ADL type, we revisit the ground state magnetization configuration and the SW spectra measured in ring structures of square, diamond and rectangular shapes made of soft ferromagnetic materials. 29,30,31 Those reports state that the closure domain is a magnetic ground state configuration, but at remanence other magnetic patterns can also form. The latter include configurations with the head-to-head and tail-to-tail domain walls trapped in the vertices of the shells around the antidots.…”

Section: Resultsmentioning

confidence: 99%

Edge localization of spin waves in antidot multilayers with perpendicular magnetic anisotropy

et al. 2020

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We study the spin-wave dynamics in nanoscale antidot lattices based on Co/Pd multilayers with perpendicular magnetic anisotropy. Using time-resolved magneto-optical Kerr effect measurements we demonstrate that the variation of the antidot shape introduces significant change in the spin-wave spectra, especially in the lower frequency range. By employing micromagnetic simulations we show that additional peaks observed in the measured spectra are related to narrow shell regions around the antidots, where the magnetic anisotropy is reduced due to the Ga + ion irradiation during the focused ion beam milling process of the antidot fabrication. The results point at new possibilities for exploitation of localized spin waves in outof-plane magnetized thin films, which are easily tunable and suitable for magnonics applications.I.

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Section: Resultsmentioning

confidence: 99%

Edge localization of spin waves in antidot multilayers with perpendicular magnetic anisotropy

et al. 2020

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“…2(b) and 5(c). The mode profile is related to that of antidot arrays [17,47] and square nanorings [48]. No stable magnetization configuration was obtained in the simulations between −10 mT and 7 mT.…”

Section: Discussionmentioning

confidence: 99%

Control of spin-wave excitations in deterministic fractals

2015

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We study spin-wave spectra of mesoscopic ferromagnetic Sierpinski carpets by means of broadbandferromagnetic resonance measurements and micromagnetic simulations. Sierpinski carpets are self-similar fractals with noninteger Hausdorff dimension that are constructed via a deterministic iteration process. The number of quantized spin-wave modes in the spectra increases with the iteration level of the carpets and the frequency splitting resembles bandpass characteristics known from fractal antennas. We find that the splitting is sensitive to the fractal dimension as well as to the relative alignment of the magnetic field and the sides of the fractals. Micromagnetic simulations provide the localization of individual spin-wave modes determined by the confinement and the inhomogeneity of the internal field.

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“…Observation of coherence and partial decoherence in Py rings in the onion state was mapped by microfocused BLS 146 . The shape of the ring added additional complexity in the static and dynamics and as opposed to a circular ring, triangular 147 and square 148 nanorings showed larger number of modes, the nature and frequencies of which strongly depend on the orientation of the applied magnetic field. A width-dependent transition from radial to azimuthal modes was observed in the square ring.…”

Section: Magnetic Ringsmentioning

confidence: 99%

Magnetization dynamics of nanoscale magnetic materials: A perspective

Barman

Mondal

Sahoo

et al. 2020

Journal of Applied Physics

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Nanomagnets form the building blocks for a gamut of miniaturized energyefficient devices including data storage, memory, wave-based computing, sensors and biomedical devices. They also offer a span of exotic phenomena and stern challenges. The rapid advancements of nanofabrication, characterization and numerical simulations during last two decades have made it possible to explore a plethora of science and technology related to nanomagnet dynamics. The progress in the magnetization dynamics of single nanomagnets and one-and two-dimensional arrays of nanostructures in the form of dots, antidots, nanoparticles, binary and bicomponent structures and patterned multilayers have been presented in details.Progress in unconventional and new structures like artificial spin ice and three-dimensional nanomagnets and spin textures like domain walls, vortex and skyrmions have been presented. Furthermore, a huge variety of new topics in the magnetization dynamics of magnetic nanostructures are rapidly emerging. An overview of the steadily evolving topics like spatiotemporal imaging of fast dynamics of nanostructures, dynamics of spin textures, artificial spin ice have been discussed. In addition, dynamics of contemporary and newly transpired magnetic architectures such as nanomagnet arrays with complex basis and symmetry, magnonic quasicrystals, fractals, defect structures, novel three-dimensional structures have been introduced. Effects of various spin-orbit coupling and ensuing spin textures as well as quantum hybrid systems comprising of magnon-photon, magnon-phonon and magnon-magnon coupling, antiferromagnetic nanostructures are rapidly growing and are expected to dominate this research field in the coming years. Finally, associated topics like nutation dynamics and nanomagnet antenna are briefly discussed. Despite showing a great progress, only a small fraction of nanomagnetism and its ancillary topics have been explored so far and huge efforts are envisaged in this evergrowing research area in the generations to come.

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Width dependent transition of quantized spin-wave modes in Ni80Fe20 square nanorings

Cited by 13 publications

References 31 publications

Edge localization of spin waves in antidot multilayers with perpendicular magnetic anisotropy

Edge localization of spin waves in antidot multilayers with perpendicular magnetic anisotropy

Control of spin-wave excitations in deterministic fractals

Magnetization dynamics of nanoscale magnetic materials: A perspective

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