Spin waves in CoFeB on ferroelectric domains combining spin mechanics and magnonics

• We have grown CoFeB on BaTiO3 exhibiting stripe-like ferroelectric a1 and a2 domains.
• We find characteristic eigenfrequencies and spin-wave modes.
• The results suggest new perspectives for electric-field control of magnonic devices.

Spin dynamics controlled by magnetoelastic coupling and applied electric fields might play a vital role in future developments of magnonics, i.e., the exploitation of spin waves for the transmission and processing of information. We have performed broadband spin-wave spectroscopy on a magnetostrictive CoFeB alloy grown on a ferroelectric BaTiO3 substrate causing elastic strain with a quasi-periodic modulation. We find characteristic eigenfrequencies and spin-wave modes with large group velocities and small damping. These results suggest bright perspectives for electric-field control of reprogrammable magnonics.