Nonreciprocal collective magnetostatic wave modes in geometrically asymmetric bilayer structure with nonmagnetic spacer

Abstract

Nonreciprocity, i.e. inequivalence in amplitudes and frequencies of spin waves propagating in opposite directions, is a key property underlying functionality in prospective magnonic devices. Here we demonstrate experimentally and theoretically...

Spin wave resonance frequency in ferromagnetic thin film with the biquadratic exchange interaction

“…However, the resonance frequency of bulk magnetic materials is limited by Snoek's limit [10]. A large number of experimental and theoretical works [11][12][13][14][15][16][17][18][19][20] have been devoted to overcoming the limitation and obtaining a higher resonance frequency. In particular, it is expected that magnetic thin films and multilayers could extend Snoek's limit and have higher resonance frequency (which determines the cut-off frequency for high frequency application) due to the application in electromagnetic devices.…”