Abstract
Spatial dependence of magnetization dynamics in a ${\mathrm{Y}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}$ film exposed to a magnetic-field gradient has been investigated by measuring local spin pumping and inverse spin-Hall effects. The result shows that, when microwaves are irradiated locally, magnetization precession is excited at a far distant position from the microwave irradiation position. By measuring the field and microwave frequency dependence, we found that the observed magnetization dynamics is attributed to nonlocal resonance of magnetization as well as the spatial change in the spin-wave dispersion under the magnetic-field gradient, which can be applied to realizing an innate microwave spectrometer: a spin-wave cochlea.
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