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We report results of micro-Brillouin-Mandelstam light scattering spectroscopyof thermal magnons in the two-phase synthetic multiferroic structure consistingof a piezoelectric (PMN-PT) substrate and a Ni thin film with the thickness of64 nm. The experimental data reveal the first two modes of the perpendicularstanding spin waves (PSSW) spatially confined across the Ni thin film. Atheoretical analysis of the frequency dependence of the PSSW peaks on theexternal magnetic field reveals the asymmetric boundary condition, i.e.pinning, for variable magnetization at different surfaces of the Ni thin film.The strain field induced by applying DC voltage to PMN-PT substrate leads to adown shift of PSSW mode frequency owing to the magneto-elastic effect in Ni,and corresponding changes in the spin wave resonance conditions. The observednon-monotonic dependence of the PSSW frequency on DC voltage is related to anabrupt change of the pinning parameter at certain values of the voltage. Theobtained results are important for understanding the thermal magnon spectrum inferromagnetic films and development of the low-power spin-wave devices.

Brillouin-Mandelstam Spectroscopy of Stress-Modulated Spatially Confined Spin Waves in Ni Thin Films on Piezoelectric Heterostructures