Abstract
We report a systematic experimental study on the refraction and reflection of magnetostatic spin-waves at a thickness step between two Permalloy films of different thickness. The transmitted spin-waves for the transition from a thick film to a thin film have a higher wave vector compared to the incoming waves. Consequently, such systems may find use as passive wavelength transformers in magnonic networks. We investigate the spin-wave transmission behavior by studying the influence of the external magnetic field, incident angle, and thickness ratio of the films using time-resolved scanning Kerr microscopy and micro-focused Brillouin light scattering.
Highlights
Johannes; Taniguchi, Takuya; Madami, Marco; Decker, Martin; Koerner, Helmut S.; Moriyama, Takahiro; Gubbiotti, Gianluca; Ono, Teruo; Back, Christian H
The targeted generation of coherent spin-waves with small wavelengths is challenging because the standard method of generating spin waves employs microwave antennas whose dimensions limit the wavelength
Overcoming this limit constitute a research field of its own: Demidov et al decreased the width of a spin-wave wave guide, changing the internal field, and subsequently reduced the spin-wave wavelength.4) Yu et al made use of the “grating-coupler effect,” where an array of ferromagnetic disks is structured on top of an insulating ferrimagnetic yttrium iron garnet (YIG) film.5,6) Here, modes that match the periodicity of these arrays are resonantly enhanced in excitation efficiency
Summary
Johannes; Taniguchi, Takuya; Madami, Marco; Decker, Martin; Koerner, Helmut S.; Moriyama, Takahiro; Gubbiotti, Gianluca; Ono, Teruo; Back, Christian H. Johannes Stigloher1, Takuya Taniguchi2, Marco Madami3, Martin Decker1, Helmut S.
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