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MA: Fachverband Magnetismus

MA 21: Magnetic Shape Memory Alloys I

MA 21.4: Vortrag

Mittwoch, 25. März 2009, 11:00–11:15, HSZ 103

Epitaxial growth of Ni₂MnGa films on perovskite manganite oxides — •Yuansu Luo, Jan Petersen, and Konrad Samwer — I. Physikalisches Institut, Universität Göttingen, Friedrich-Hund Platz 1, 37077 Göttingen

Magnetic sharp memory (MSM) films Ni₂MnGa were sputtered onto perovskite manganite oxide layers, such as La_0.7Ca_0.3MnO₃ (LCMO) to show a potential affect coupled with Jahn-Teller distortion and MSM effect. The manganite layer (80 nm) was deposited at deposition temperature T_s= 700^∘C on MgO(100) substrate and subsequently the MSM layer (150nm) at varied T_s in the range 500-600^∘C. Structural investigation was carried out by x-ray diffraction and scanning electron microscopy. The initial result indicates a well epitaxial growth of Ni₂MnGa on the LCMO layer, showing a martensitic phase at room temperature with twin structure strips along two vertical orientations. The microstructure of the samples strongly depends on T_s used. Compared to polycrystalline samples prepared on SiO₂, the epitaxial growth used here is advantageous to form the martensitic phase. (Supported by BMBF-project 13N10061 MSM-Sens)