Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Magnetic Heuslers, Half-metals and Oxides (jointly with TT)

MA 15.8: Vortrag

Montag, 20. März 2017, 17:00–17:15, HSZ 403

Study of compensated ferrimagnetic Heusler materials Mn3−xPtxGa — •Vivek Kumar1, Ajaya K. Nayak1,2, and Claudia Felser11Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Max Planck Institute of Microstructure Physics, Halle, Germany

Compensated ferrimagnets with large spin polarization and high ordering temperature are perfect candidates for realization of antiferromagnetic spintronics. These materials with additional perpendicular magnetocrystalline anisotropy can be ideal candidates for spin transfer torque applications. In this direction Heusler materials find special attention where chemical disorder can be used as an engineering tool to improve desired properties. The tetragonal Mn3Ga is an interesting candidate as a starting material which exhibits a high Curie temperature (TC). It is theoretically predicted that substitution of Mn with a late transition metal can lead to a decrease in the total magnetic moment [1]. Here we present the structural and magnetic properties of single phase bulk tetragonal Mn3−xPtxGa Heusler materials for x varying from 0 to 0.6. We have found that the tetragonal distortion increases with increasing Pt concentration, indicating stabilization of the tetragonal phase with Pt substitution. With increasing Pt concentration the total magnetic moment systematically decreases and reach a compensation point around x=0.6. Although the magnetic ordering temperature displays a slight reduction with Pt substitution the compensated sample exhibits a TC well above room temperature.
[1]R. Sahoo et al., Adv. Mat. 28, 8499 (2016).

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