Spin wave collimation using a flat metasurface

Zelent, Mateusz; Mailyan, M.; Vashistha, Vishal; Gruszecki, Paweł; Gorobets, Oksana; Gorobets, Yu. I.; Krawczyk, Maciej

doi:10.1039/c8nr10484k

Cited by 17 publications

(10 citation statements)

References 41 publications

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“…In thin films with out-of-plane magnetization the forward volume SW dispersion relation is isotropic, offering better prospect for direct translation of various ideas from photonics into magnonics. 13,14,15 Moreover, a full magnonic band gap has been theoretically predicted, 16 and a fast SW guiding along a defect in perpendicularly magnetized ADL was experimentally demonstrated. 17 However, to saturate a ferromagnetic film in the out-of-plane direction, an external magnetic field exceeding its demagnetizing field is required.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…To create skyrmions by spin waves, the spin wave energy should be accumulated to overcome the energy barrier, which has been realized by the combination of the geometry change and the DMI-induced effective magnetic field [21] and by spin wave focusing [22]. In previous studies, the spin wave focusing is achieved by constructing a spin wave lens, which can be designed by a curved interface [22][23][24], a local graded-index region [25,26], and a metasurface [27,28]. In these methods, the spin wave reflection at the interface would decrease the efficiency of spin wave focusing.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Skyrmion Generation by Reflective Spin Wave Focusing

et al. 2021

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We propose a method to generate magnetic skyrmions by focusing spin waves totally reflected by a curved film edge. The edge contour is derived to be parabolic and frequency-independent based on the identical magnonic path length principle. We performed micromagnetic simulations to verify our theoretical design. Under proper conditions, the reflected spin waves first converge at the focal point with the enhanced intensity leading to the emergence of magnetic droplets, which are then converted to magnetic skyrmion accompanied by a change in the topological charge. We numerically obtain the phase diagram of skyrmion generation with respect to the amplitude and frequency of the driving field. Our finding would be helpful for the design of spintronic devices combining the advantage of skyrmionics and magnonics.

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“…The concept of metasurfaces has also recently received attention in magnonics [8], [9], [10], which is a subfield of magnetism focused on spin waves (SWs), particularly in the context of their applications to information transfer and signal processing. The pioneering theoretical demonstration of metasurfaces acting on SWs enabled their focusing by applying modulation of the exchange interaction alongside the interface between two interconnected ferromagnetic layers [11]. In the later studies, it was shown that by continuous varying the value of the magnetocrystalline anisotropy or saturation magnetization in a narrow region between the ferromagnetic waveguide and the thin film, an anomalous refractive effect can be obtained for SWs, allowing SWs to be efficiently bent in the waveguides [12].…”

Section: Introductionmentioning

confidence: 99%

Control of the phase of reflected spin-waves from magnonic Gires-Tournois interferometer of subwavelength width

Sobucki,

Gruszecki,

Rychły

et al. 2021

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The phase is one of the fundamental properties of a wave that allows to control interference effects and can be used to efficiently encode information. We examine numerically a magnonic resonator of the Gires-Tournois interferometer type, which enables the control of the phase of spin waves reflected from the edges of the ferromagnetic film. The considered interferometer consists of a Py thin film and a thin, narrow Py stripe placed above its edge, both coupled magnetostatically. We show that the resonances and the phase of the reflected spin waves are sensitive for a variation of the geometrical parameters of this bilayerd part of the system. The high sensitivity to film, stripe, and non-magnetic spacer thicknesses, offers a prospect for developing magnonic metasurfaces and sensors.

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Spin wave collimation using a flat metasurface

Cited by 17 publications

References 41 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

Magnetic Skyrmion Generation by Reflective Spin Wave Focusing

Control of the phase of reflected spin-waves from magnonic Gires-Tournois interferometer of subwavelength width

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