Interlayer interaction in multilayer CoPt/Co structures
E. S. Demidov, N. S. Gusev, L. I. Budarin, E. A. Karashtin, V. L., Mironov, A. A. Fraerman
TL;DR
This study investigates the interlayer exchange interaction in multilayer CoPt/Co structures, revealing non-collinear magnetic states and strong coupling, using magnetooptical Kerr effect and ferromagnetic resonance measurements.
Contribution
It provides new insights into the magnetic coupling and anisotropy in CoPt/Co multilayers with variable spacer thickness, supported by a theoretical model based on the Landau-Lifshitz-Gilbert equation.
Findings
Identification of non-collinear magnetic states
Strong exchange coupling between layers
Quantitative estimates of anisotropy and exchange parameters
Abstract
We report a study of interlayer exchange interaction in multilayer CoPt/Co structures consisting of periodic CoPt multilayer film with an "easy axis" anisotropy and thick Co layer with an "easy plane" anisotropy separated by Pt spacer with variable thickness. The magnetooptical Kerr effect (MOKE) and ferromagnetic resonance (FMR) measurements show up the essentially non-collinear state of magnetic moments of the layers and strong exchange coupling between CoPt and Co subsystems. The estimation of effective anisotropy and exchange coupling in a simple model based on the Landau-Lifshitz-Gilbert equation describing magnetization dynamics was performed.
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