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  Seemann, K.M.; Kronast, F.; Horner, A.; Valencia, S.; Wixforth, A.; Chaplik, A.V.; Fischer, P.: Attenuation of surface acoustic waves by spin-wave excitations in Co₆₀Fe₂₀B₂₀. Spin 4 (2014), p. 1440005/1-5

10.1142/S2010324714400050
Open Access Version (externer Anbieter)

Abstract:
The acousto-magnetic attenuation of surface acoustic waves (SAW) in an Co60Fe20B20 exchange spring magnet is evidenced experimentally. By high-resolution magnetic imaging using photo-excitation electron microscopy (XPEEM) and magnetometry measurements, the deflection of the ferromagnet from its equilibrium state is visualized. Along a harmonic oscillator model with damping term, the experimental observation of SAW attenuation is attributed to low-frequency spin wave generation in a magnetic exchange spring. Measuring the SAW attenuation at four eigenfrequencies generated via on-chip higher-harmonic generation, we obtain a sub-GHz resonance at f0 = 538 MHz.