Frequency and magnetic field mapping of magnetoelastic spin pumping in high overtone bulk acoustic wave resonator.

We report on the first observation of microvolt-scale inverse spin Hall effect (ISHE) dc voltage driven by an acoustic spin pumping (ASP) in a bulk acoustic wave (BAW) resonator formed by a Al-ZnO-Al-YIG(1)-GGG-YIG(2)-Pt structure. When 2 mW power is applied to an Al-ZnO-Al transducer, the voltage <italic>V</italic>_ISHE ∼ 4 μV in the Pt film is observed as a result of resonant ASP from YIG(2) to Pt in the area ∼ 170 μm. The results of frequency and magnetic field mapping of <italic>V</italic>_ISHE(<italic>f,H</italic>) together with reflectivity of the resonator show an obvious agreement between the positions of the voltage maxima and BAW resonance frequencies <italic>f</italic>_{<italic>n</italic>}(<italic>H</italic>) on the (<italic>f, H</italic>) plane. At the same time a significant asymmetry of the <italic>V</italic>_ISHE(<italic>f</italic>_{<italic>n</italic>}(<italic>H</italic>)) value in reference to the magnetoelastic resonance (MER) line <italic>f</italic>_MER(<italic>H</italic>) position is revealed, which is explained by asymmetry of the magnetoelastic waves dispersion law. [ABSTRACT FROM AUTHOR]