Goos-Hänchen effect and bending of spin wave beams in thin magnetic films

Gruszecki, Paweł; Romero-Vivas, Javier; Dadoenkova, Yu. S.; Lyubchanskii, I.L.; Krawczyk, Maciej

doi:10.1063/1.4904342

Cited by 61 publications

(49 citation statements)

References 39 publications

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“…Spatially, this magnetic field is Gaussian in y and has a step profile in x, 8 cells wide, similar to the approach in Ref. 33. The magnetic field is directed along x, with an amplitude of 0.2 mT, and a frequency of f 0 = 1 GHz.…”

Section: Micromagnetic Modellingmentioning

confidence: 83%

Graded index lenses for spin wave steering

et al. 2019

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We use micromagnetic modelling to demonstrate the operation of graded index lenses designed to steer forward-volume magnetostatic spin waves by 90 and 180 degrees. The graded index profiles require the refractive index to diverge in the lens center, which, for spin waves, can be achieved by modulating the saturation magnetization or external magnetic field in a ferromagnetic film by a small amount. We also show how the 90 • lens may be used as a beam divider. Finally, we analyse the robustness of the lenses to deviations from their ideal profiles. SUPPLEMENTAL MATERIAL List of Supplementary Animations and their CaptionsAnimation 1 (a) -Wave packet incident on 90 degree lens: Video corresponding to Fig. 6 (a) in the main text, showing the m x component of the wave packet moving through the 90 • lens. Animation 1 (b) -Wave packet incident on 180 degree lens: Video corresponding to Fig. 6 (b) in the main text, showing the m x component of the wave packet moving through the Eaton (180 • ) lens.Animation 2 (a) -90 degree lens as a beam divider: Video corresponding to Fig. 7 (a) in the main text, showing the 90 • lens acting as a ±90 • half-power beam divider. The m x component of the beam is shown. Animation 2 (b) -90 degree lens as a wave packet divider: Video corresponding to Fig. 7 (b) in the main text, showing the 90 • lens acting as a ±90 • half-power beam divider for an incoming wave packet. The m x component of the wave packet is shown.Each animation uses the parameters stated in the main text.

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Section: Micromagnetic Modellingmentioning

confidence: 83%

Graded index lenses for spin wave steering

et al. 2019

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“…Spin waves with a DE propagation geometry exhibit a well-defined wave vector along the channel, enabling data transport and processing using wave properties. The beamwidth of the bound mode is smaller than 24nm and is almost independent from frequency, which can avoid the boundary scattering [38] caused by edge irregularity and the extra dispersion [40]. In addition, a relative high group velocity exceeding 1km/s promises the channeled mode a candidate for computing technology.…”

Section: Resultsmentioning

confidence: 99%

Magnonic waveguide based on exchange-spring magnetic structure

Wang

Gao

et al. 2018

AIP Advances

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We propose to use a soft/hard exchange-spring coupling bilayer magnetic structure to introduce a narrow channel for spin-wave propagation. We show by micromagnetic simulations that broad-band Damon-Eshbach geometry spin waves can be strongly localized into the channel and propagate effectively with a proper high group velocity. The beamwidth of the bound mode spin waves is almost independent from the frequency and is smaller than 24nm. For a low-frequency excitation, we further investigate the appearance of two other spin beams in the lateral of the channel. In contrast to a domain wall, the channel formed by exchange-spring coupling can be easier to realize in experimental scenarios and holds stronger immunity to surroundings. This work is expected to open new possibilities for energy-efficient spin-wave guiding as well as to help shape the field of beam magnonics.

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“…Due to the inhomogeneities of the internal field and magnetization [ Fig. 3(a)], the beam curves slightly [42][43][44][45] and experiences distributed scattering, with the group velocities of the scattered waves being roughly aligned with the arm's length [ Fig. 3(d)].…”

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confidence: 99%

Towards graded-index magnonics: Steering spin waves in magnonic networks

et al. 2015

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Magnonics explores precessional excitations of ordered spins in magnetic materials-so-called spin wavesand their use as information and signal carriers within networks of magnonic waveguides. Here, we demonstrate that the nonuniformity of the internal magnetic field and magnetization inherent to magnetic structures creates a medium of graded refractive index for propagating magnetostatic waves and can be used to steer their propagation. The character of the nonuniformity can be tuned and potentially programmed using the applied magnetic field, which opens exciting prospects for the field of graded-index magnonics. Over the past decade, magnonics (the study of spin waves-precessional excitations of ordered spins in magnetic materials [1]) has emerged as one of the most rapidly growing research fields in magnetism [2,3]. Moreover, recent advances in the understanding of fundamental properties of spin waves in magnetic micro-and nanostructures have highlighted magnonics as a potential rival of or complement to semiconductor technology in the field of data communication and processing [4]. The push for miniaturization renders ferromagnetic transition metals and their alloys to be materials of choice for the fabrication of spin-wave devices [5,6]. However, loss reduction, the shortening of the wavelength of studied spin waves, and the associated miniaturization of the implemented magnonic concepts and devices remain major challenges in both experimental research and technological development in magnonics [2,3].In this Rapid Communication, we explore an approach to meet these challenges that is based on the concept of gradedindex (or gradient-index) optics [7]. As applied to spin waves, this concept is based on the following basic ideas. First, the propagation of spin waves is controlled using subwavelength, often continuously varying, magnetic nonuniformities [8,9]. This should minimize scaling of the device size with the magnonic wavelength, in contrast to, e.g., magnonic crystal based approaches [3], and thereby ease the associated patterning resolution requirements. Indeed, nonuniform effective magnetic field and magnetization configurations have been shown to confine [10,11] and channel [12][13][14][15] spin waves, to continuously modify their character [16][17][18], and to enable their coupling to essentially uniform free space microwaves [19,20]. Here, we go further by exploiting in addition the anisotropic dispersion inherent to spin waves dominated by the dynamic magneto-dipole field-so-called magnetostatic spin waves [1]. The symmetry axis of the anisotropic magnetostatic dispersion coincides with the direction of the magnetization [21][22][23]. This anisotropic dispersion leads to the formation of nondiffracting caustic spin-wave beams * Corresponding author: v.v.kruglyak@exeter.ac.uk [24][25][26][27][28][29][30] and to anomalous spin-wave reflection, refraction, and diffraction [31][32][33][34][35]. Here, we explore these ideas in networks of magnonic waveguides [6,8,[12][13][14][15][16][17][18][19][20]24,...

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Goos-Hänchen effect and bending of spin wave beams in thin magnetic films

Cited by 61 publications

References 39 publications

Graded index lenses for spin wave steering

Graded index lenses for spin wave steering

Magnonic waveguide based on exchange-spring magnetic structure

Towards graded-index magnonics: Steering spin waves in magnonic networks

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