RT Journal Article
SR Electronic
T1 High-frequency magnetoacoustic resonance through strain-spin coupling in perpendicular magnetic multilayers
JF Science Advances
JO Sci Adv
FD American Association for the Advancement of Science
SP eabb4607
DO 10.1126/sciadv.abb4607
VO 6
IS 38
A1 Zhang, De-Lin
A1 Zhu, Jie
A1 Qu, Tao
A1 Lattery, Dustin M.
A1 Victora, R. H.
A1 Wang, Xiaojia
A1 Wang, Jian-Ping
YR 2020
UL http://advances.sciencemag.org/content/6/38/eabb4607.abstract
AB 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 state near the resonance. We also detail its precise dependence on the magnetostriction. The results of this work offer a potential pathway to manipulating both the magnitude and timing of EHF and strongly coupled magnon-phonon excitations.