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DF: Fachverband Dielektrische Festkörper

DF 12: Poster 1

DF 12.53: Poster

Dienstag, 12. März 2013, 10:30–13:30, Poster D

Structural and magnetic properties of Ni-Co-Mn-Sn thin films — •Ramudu Machavarapu, Christian Mix, and Gerhard Jakob — Institut für Physik, Johannes Gutenberg-Universität Mainz, 55128 Mainz

Ni-Co-Mn-Sn alloys have drawn interest recently due to their multifunctional properties like magnetic shape memory effect (MSME), magnetocaloric effect and direct conversion of heat to electricity. It is well recognized that the austenite of the Ni-(Co)-Mn-X (X = In, Sn, Sb) alloys has a ferromagnetic state below the Curie temperature (TC) and a paramagnetic state above TC. However, the low-temperature martensite exhibits different magnetic behavior such as ferromagnetic, paramagnetic, antiferromagnetic and spin glass, depending on exact composition. These alloys also have shown thermoelastic martensitic transformations at high temperatures. To gain a deep understanding of the functional properties of these alloys, it is very important to investigate their structural and magnetic properties in detail.

Thin films of Ni-Co-Mn-Sn have been prepared on single crystalline MgO (100) substrate using DC magnetron sputtering. The preparation parameters like sputtering power, substrate temperature and argon gas pressure were optimized. Crystal structure of thin films was studied using X-ray diffraction. Detailed structural transformations and magnetic properties were investigated using superconducting quantum interference device (SQUID) magnetometer.

We acknowledge financial support by the DFG within priority program SPP 1239 (Ja821/3-3).