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MA: Fachverband Magnetismus

MA 15: Magnetism Poster A

MA 15.61: Poster

Dienstag, 2. April 2019, 10:00–13:00, Poster E

Heusler compound layer systems analysed with different HRTEM techniques — •Daniela Ramermann, Andreas Becker, Inga Ennen, Martin Gottschalk, Björn Büker, and Andreas Hütten — Center for Spinelectronic Materials and Devices, Physics Department, Bielefeld University, 33615 Bielefeld, Germany

Heusler compounds are with their strong magnetic properties promising candidates for thin film devices as also for magnetocaloric applications. Needed are custom-tailored magnetic properties, where the electron microscope helps with evaluation of the properties on a nanoscopic scale. Especially NiCoMnAl in intercalating layers of martensite/austenite crystal structure show unexpected behavior: a reproducable checkerboard pattern when certain layer thickness requirements are met. This pattern is investigated with HR-TEM methods also including energy-loss magnetic dichroism and differential phase contrast imaging, revealing slightly twisted against each other alternating stacked structures of martensite and austenite and magnetism centering on the Mn atoms.