High-frequency magnetoacoustic resonance through strain-spin coupling in perpendicular magnetic multilayers.

ABSTRACT: It is desirable to experimentally demonstrate an extremely high resonant frequency, assisted by strain-spin coupling, in technologically important perpendicular magnetic materials for device applications. Here, we directly observe the coupling of magnons and phonons in both time and frequency domains upon femtosecond laser excitation. This strain-spin coupling leads to a magnetoacoustic resonance in perpendicular magnetic [Co/Pd] n multilayers, reaching frequencies in the extremely high frequency (EHF) band, e.g., 60 GHz. We propose a theoretical model to explain the physical mechanism underlying the strain-spin interaction. Our model explains the amplitude increase of the magnetoacoustic resonance state with time and quantitatively predicts the composition of the combined strain-spin stat

SUBMITTER: Zhang DL 

PROVIDER: S-EPMC7500926 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature