Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 11: Focus Session: Magnetic materials for energy efficient applications

MA 11.4: Hauptvortrag

Montag, 1. April 2019, 17:15–17:45, H38

Compositionally graded films as model systems to study magnetic materials for energy applications — •Nora Dempsey — Univ. Grenoble Alpes, CNRS/UGA, Grenoble INP, Institut Néel, Grenoble, France

Combinatorial thin film studies are being used for the screening and optimization of a range of functional materials [1]. The basic idea is to produce compositionally graded films, to allow high throughput screening of materials properties as a function of composition, as well as other processing parameters such as deposition temperature and post-deposition annealing. In this talk I will present studies of compositionally graded films of two types of magnetic materials of interest for energy applications, namely hard magnetic materials and magnetocaloric materials. Films were produced by sputtering asymmetric targets. Composition variations were characterised using EDX mapping while structural and magnetic characterisation was performed with SEM, XRD and magnetometry. A scanning polar MOKE set-up incorporating a bipolar pulsed magnetic field system capable of applying fields of up to 10 T was specifically developed for high throughput magnetic characterisation of these compositionally graded films [2]. The relationship between processing parameters and structural and magnetic properties will be presented.

[1] M. L. Green, I. Takeuchi, and J. Hattrick-Simpers, J. Appl. Phys. 113 (2013) 231101 [2] A. Dias, Gabriel Gomez, Dominique Givord, et al., AIP ADVANCES 7 (2017) 056227