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MA: Fachverband Magnetismus

MA 28: Thin Films: Magnetic Anisotropy

MA 28.5: Talk

Wednesday, March 20, 2024, 16:00–16:15, EB 107

Influence of cap layer material and deposition pressure on the perpendicular magnetic anisotropy in Co/Pt and CoFeB/Pt multilayers — •Raphael Kohlstedt¹, Rico Ehrler¹, Peter Heinig^1,2, and Olav Hellwig^1,2 — ¹Chemnitz University of Technology, D-09107 Chemnitz, Germany — ²Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, D-01328 Dresden, Germany

Co/Pt magnetic multilayers (MLs) often serve as perpendicular magnetic anisotropy (PMA) model systems for magnetic data storage. Concerning dynamic applications CoFeB based MLs received much interest because of their smooth growth and because of the low intrinsic magnetic damping in magnetically soft CoFeB in-plane single layers, which opened up possibilities for new applications [1, 2]. Often PMA ML systems are protected from oxidation by a cap layer, which usually does not attract much attention. Nevertheless, if the CL makes up a significant part of the whole film thickness or is in direct contact with the magnetic material there are a few important things to consider when choosing the material and the deposition pressure. In this study, the influence of the CL on [Co/Pt]_X and [CoFeB/Pt]_X (X…repetition number) by varying the material and the deposition pressure is investigated. The effect of interdiffusion of the cap layer material in highly out-of-plane textured (Co/Pt) and polycrystalline towards amorphous (CoFeB/Pt) MLs is presented using XRD, XRR, and magnetometry.

[1] D. Wang et al. IEEE Trans. Magn., 40(4), 2004

[2] von Korff Schmising et al. Phys. rev. res., 5(1), 2023

Keywords: perpendicular magnetic anisotropy; magnetic multilayers; CoFeB; X-Ray diffraction; X-Ray reflection