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Spin pumping by nonreciprocal spin waves under local excitation
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematic illustration of measurement configuration. Two needle probes contacting on the surface of the Pt layer are connected with a voltmeter. H and denote bias and microwave magnetic fields, respectively. denotes spin current density and denotes an electric field converted from via inverse spin Hall effect. (b) Voltage spectrum excited at a microwave frequency of 4 GHz. The excitation field for FMR and the field regions for magnetostatic surface and backward-volume spin waves (MSSW and MSBVW) are illustrated. The solid line is obtained by fitting with four Gaussian functions. Each function is shown by broken lines.

Image of FIG. 2.
FIG. 2.

(a) Voltage spectra excited at a microwave frequency of 4 GHz with various excitation powers for +H. denotes the field strength at the maximum voltage. (b) Excitation power dependence of maximum value in a voltage spectrum for +H and –H. The solid lines are the fitting results. (c) Frequency dependence of . The solid curve is obtained by fit procedure using the Kittel formula.

Image of FIG. 3.
FIG. 3.

Voltage spectra observed at various prober positions at +H and –H, where the excitation power is 20 mW and the frequency is 4 GHz.

Image of FIG. 4.
FIG. 4.

Normalized spin pumping intensity as determined by differential of peak voltage for (a) peak 1 and (b) peak 2 of MSSWs in Fig. 2(a) , and (c) peak of the FMR mode in a polycrystalline sample. The individual solid lines are obtained by fitting with a Gaussian function. Colored region corresponds to the region on the signal line.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Spin pumping by nonreciprocal spin waves under local excitation