Coupling strength dependence on temperature and Fe layer thickness in Fe/MgO superlattices
We investigate the effect of Fe layer thickness on the interlayer exchange coupling in Fe/MgO superlattices depending on temperature. It has been shown previously that the thickness of the MgO spacer layer and the number of bilayer repetitions influence the coupling strength and magnetic order across the superlattice layers. In order to fully explain these experimental observations, beyond nearest neighbor interactions need to be included, even though these are not expected from the models currently available to describe tunneling mediated interlayer exchange coupling. While also the Fe layer thickness would influence the total extension of the superlattice and, hence, the long-range interactions, its influence has not been investigated yet. But within this study a linear dependence of the coupling strength on the Fe layer thickness has been oberserved. Using a combination of magneto-optical Kerr effect measurements, and polarized neutron reflectometry, the direction of magnetization in each Fe layer at different applied magnetic fields is investigated at different temperatures, which might allow for investigating the origin of these long range interactions in Fe/MgO superlattices.
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Anna L. Ravensburg; KAPAKLIS VASSILIOS and Alexei Vorobiev. (2023). Coupling strength dependence on temperature and Fe layer thickness in Fe/MgO superlattices. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.CRG-2955
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