Issue 13, 2022

Mixing of acoustic and optical excitations in Ru/Co based multilayers

Abstract

Two series of [Ru10/Cox)]12 and [Ru6/Cr3/Cox)]12x = 16–60 easy-plane anisotropy multilayers (all thicknesses in Å), prepared by sputter deposition, are studied by cavity FMR. The resonance fields of the modes excited by setting the rf field perpendicular to the saturating (in-plane) field are in good agreement with the values predicted for pure acoustic modes by a simple two-macrospin model. In contrast, the resonance fields of the modes excited by setting the rf field parallel to the saturating field, are lower than those expected for pure optical modes. This is attributed to the existence of hybridized mixed modes. Micromagnetic simulations show that (a) the inhomogeneous magnetization profile along the multilayer thickness is sufficient to give rise to mode mixing and (b) that mode mixing is not limited to the region where the frequencies of the acoustic and optical modes coincide.

Graphical abstract: Mixing of acoustic and optical excitations in Ru/Co based multilayers

Article information

Article type
Paper
Submitted
03 Feb 2022
Accepted
26 May 2022
First published
30 May 2022
This article is Open Access
Creative Commons BY license

Mater. Adv., 2022,3, 5451-5457

Mixing of acoustic and optical excitations in Ru/Co based multilayers

P. Ntetsika, G. Mitrikas, G. Litsardakis and I. Panagiotopoulos, Mater. Adv., 2022, 3, 5451 DOI: 10.1039/D2MA00119E

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