Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 8: Magnetic Shape Memory Alloys
MA 8.4: Vortrag
Montag, 22. März 2010, 16:00–16:15, H22
Ab initio characterization of new ferromagnetic Fe-Ni-Co-Zn-Ga shape memory alloys — •Antje Dannenberg1, Markus Ernst Gruner1, Manfred Wuttig2, and Peter Entel1 — 1Faculty of Physics, University of Duisburg-Essen, 47048 Duisburg, Germany — 2Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA
Ferromagnetic shape memory alloys (FSMA) have received increasing interest, due to their potential use as smart materials for actuator and sensor applications, but for a technological breakthrough the operation temperatures are still too low.
In this report, we present a systematic investigation of the structural, electronic and magnetic properties of various systems based on Fe-Co-Ni-Ga-Zn. The results of our ab initio and Monte Carlo calculations predict high Curie temperatures for the Fe-based systems and show competing ordering between the conventional X2YZ Heusler and the inverse (XY)XZ Heusler structure. The new Zn-based alloys may be promising new FSMA as they combine high TC and the required structural properties but at the expense of structural stability.