Spin waves

Yttrium iron garnet (YIG) films on silicon substrates (Si) are of a great interest due to compatibility of their fabrication with semiconductor technologies and, thus, possible integration of magnonic and electronic devices on one chip. However, features of spin wave propagation in YIG films on semiconductor substrates remain almost unexplored.

The paper describes results of experimental investigations on a formation of bright and dark envelope solitons with pulsed, monochromatic and two­frequency excitation of microwave spin waves in a magnetic film periodic structure – a magnonic crystal. The envelope solitons were excited at particular frequencies in the vicinity of magnonic bandgaps formed due to the Bragg resonance.