Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 17: Magnetic Heuslers, Half-Metals and Oxides (joint session MA, TT, organized by MA)

TT 17.8: Talk

Monday, March 20, 2017, 17:00–17:15, HSZ 403

Study of compensated ferrimagnetic Heusler materials Mn_3−xPt_xGa — •Vivek Kumar¹, Ajaya K. Nayak^1,2, and Claudia Felser¹ — ¹Max 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 (T_C). 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 Mn_3−xPt_xGa 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 T_C well above room temperature.
[1]R. Sahoo et al., Adv. Mat. 28, 8499 (2016).