Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 17: Poster Session I

MA 17.52: Poster

Dienstag, 8. März 2016, 09:30–12:30, Poster B1

Magnetic and magnetoelastic properties of NiCoMnAl-shape memory Heusler alloys — •Andreas Becker and Andreas Hütten — Center for Spinelectronic Materials and Devices, Physics Department, Bielefeld University, Germany

Magnetic shape memory alloys offer a large variety of functionality. Magnetic Materials, which undergo a first order phase transformation, are especially needed in magnetocaloric cooling, because they exhibit a large temperature and entropy change upon magnetic loading. Such materials often consist of rare materials and are therefore not suitable for commercial applications.

Measurements reveal, that NiCoMnAl-Heusler-alloys thin films, grown on an MgO-Substrate or a Vanadium buffer layer by sputtering deposition, achieve a large magnetocaloric effect, while consisting of common elements. The aim of our research is to investigate the magnetic and magnetoelastic properties of austenite films. To measure the induced strain, caused by the martensitic phase transition and the spinpolarization, TMR-junctions are grown and fabricated by e-beam lithography on top of the Heusler alloy films. Additionally, temperature dependent XRD-measurements of different compositions will be presented.