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MA: Fachverband Magnetismus

MA 52: Magnetic Thin Films III

MA 52.8: Talk

Thursday, March 17, 2011, 12:45–13:00, HSZ 403

Tuning the magnetic anisotropy in Mn_3−xCo_xGa Heusler compounds for spintronic applications — •Vajiheh Alijani, Jürgen Winterlik, Benjamin Balke, Gerhard H. Fecher, and Claudia Felser — Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg - University, 55099 Mainz

Heusler compounds such as tetragonal phase of Mn_3−xGa are currently receiving increased interest due to their benefits for applications, especially in the research field of spintronics. Our current research is particularly focused on Mn₂-based Heusler compounds. These compounds are of exceptional importance due to their large diversity of adaptive magnetic properties and their tunability by variation of several physical parameters such as temperature, magnetic field, or electron-doping. The materials Mn_3−xCo_xGa, i. e. substitution of Mn atoms by Co, exhibit very interesting features. While the Mn-rich alloys are very similar to Mn₃Ga as they crystallize in the identical tetragonal structure and show comparable hard-magnetic properties, the Co-rich samples show the cubic Heusler structure, soft-magnetic hysteresis loops, and perfect Slater Pauling behavior. This facilitates the tuneability of the magnetic anisotropy by varying the Co concentration. This work is supported by the Deutsche Forschungsgemeinschaft through the ASPIMATT projects TP 1.2-A (CH 952/1-1) and TP 2.3-A (FE 633/11-1).