Actuation, propagation, and detection of transverse magnetoelastic waves in ferromagnets

摘要

We study propagation of ultrasonic waves through a ferromagnetic medium withspecial attention to the boundary conditions at the interface with anultrasonic actuator. In analogy to charge and spin transport in conductors, weformulate the energy transport through the system as a scattering problem. Wefind that the magneto-elastic coupling leads to a non-vanishing magnetic(elastic) energy accompanying the acoustic (spin) waves with a resonantlyenhanced effect around the dispersion relation anti-crossing point. Wedemonstrate the physics of excitation of magnetization dynamics via acousticwaves injection around the ferromagnetic resonance frequency.