Berlin 2008 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 36: Phase Transitions II

MM 36.2: Vortrag

Donnerstag, 28. Februar 2008, 12:00–12:15, H 0107

Strain measurements in ferromagnetic martensitic Heuslers and magnetization easy axis — •Seda Aksoy, Mehmet Acet, and Eberhard F. Wassermann — Experimentalphysik, Universität Duisburg-Essen, Duisburg, Germany

The temperature-dependence of strain under constant magnetic-fields is studied in Ni-Mn-X (X: Ga, In, Sn, Sb) and Ni-Mn-In-X (X: Ga, Sn, Sb) polycrystalline ferromagnetic Heusler alloys which undergo a martensitic transformation close to room-temperature. The applied magnetic-field influences the nucleation of martensite so that decreasing the temperature under a magnetic field leads to large length changes between the austenite and martensite states. The length-change within the martensitic state varies with the magnitude of the cooling-field. This is related to the variant-orientation during martensite nucleation. These strain-data provide information on the easy axis of magnetization.