Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 36: Magnetic Heusler Compounds II
MA 36.6: Vortrag
Donnerstag, 29. März 2012, 11:30–11:45, H 1012
Exchange bias behavior in new tetragonal Heusler compound Mn2PtIn — •A. K. Nayak1, J. Winterlik2, G. H. Fecher1,2, and C. Felser1,2 — 1Max Planck Institute for Chemical Physics of Solids, Dresden — 2Institute of Inorganic Chemistry and Analytical Chemistry, Johannes Gutenberg - University, Mainz
Mn2YZ based Heusler systems show both stable cubic and tetragonal phases at room temperature with both ferro- and ferrimagnetic ordering. Due to large spin polarization of the conduction electrons, these materials are considered to be one of the most important candidates for spintronics application. It is also suggested that tetragonal alloys are suitable candidates for spin torque transfer (STT) applications. Another stimulating factor related to multi-functionality in tetragonal Heusler alloys is their potential use for achieving large perpendicular magnetic anisotropy (PMA) required in high density perpendicular magnetic recording media. In this meeting we will present the structural and magnetic properties of the new tetragonal Heusler compound Mn2PtIn. The low temperature hysteresis loop shows hard-magnetic behavior with low saturation magnetization, which suggests ferrimagnetic ordering in the present system. The shifted field cooled hysteresis loop indicates the presence of unidirectional exchange anisotropy, which is observed in systems showing exchange bias (EB). The observed EB behavior mainly originates from the glassy nature of the low temperature magnetic state, which is confirmed by ac susceptibility and zero field cooled relaxation measurements.