Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 60: Magnetic Coupling and Anisotropy in Thin Films (joint session MA/DS)
MA 60.8: Talk
Friday, March 20, 2020, 11:30–11:45, HSZ 04
Magneto-optical signal dependence on Co-layer thickness asymmetry in Co/Pt/Co-films — •Ramon Weber1, Carmen Martín Valderrama1,2, Lorenzo Fallarino1, and Andreas Berger1 — 1CIC nanoGUNE, E-20018 Donostia-San Sebastian, Spain — 2Faculty of Science, University of Valladolid, E-47011 Valladolid, Spain
Ever since the first observation of interlayer exchange coupling, magnetic multilayers have been a research subject of tremendeous importance, leading to many surprising phenomena. In a recent study, Tomita et al. [1] observed a most significant enhancement of the magneto-optical response in Fe/Pt multilayers that followed an inverse Fibonacci thickness stacking in comparison to periodically modulated reference samples. This effect could not be explained by classical electromagnetic theory assuming local material dependent dielectric properties, but might be related to quantum mechanical interferences associated with non-periodic stacking of nm-scale magnetic films and their resulting quantum well states. To test this explanation, we fabricated a series of Co/Pt/Co bilayer structures with pre-defined and variable thickness asymmetry of the Co layers, while keeping the total Co thickness constant. The optical and magneto-optical properties of these films were measured using Generalized Magneto-optical Ellipsometry, both as a function of the Co-layer thickness asymmetry and the Pt interlayer thickness.
[1] S. Tomita, T. Suwa, P. Riego, A. Berger, H. Nobuyoshi, and H. Yanagi, Phys. Rev. Appl. 11, 064010 (2019).