Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 53: Magnetic Heuslers, half-metals and oxides

MA 53.6: Vortrag

Freitag, 5. April 2019, 10:45–11:00, H33

Magnetic Compensation in Mn₃Ge-based Heusler Alloys with Addition of Ni, Pt and Pd — •Johannes Seyd, Nataliia Yurievna Safonova, and Manfred Albrecht — Institute of Physics, University of Augsburg, D-86159 Augsburg, Germany

Mn₃Ge is a ferrimagnetic Heusler alloy with promising properties for spintronic applications, for example a high coercive field and low saturation magnetization^[1]. We investigated substitution effects of Ni, Pt and Pd on phase formation and magnetic properties of D0₂₂-Mn₃Ge thin films with the intent of further lowering the saturation magnetization^[2]. We prepared (Mn_1−xM_x)₃Ge (with M=Ni, Pt, Pd) thin films by magnetron sputtering with x varying from 0.03 to 0.6 and analysed the composition and film thicknesses by Rutherford backscattering spectroscopy.

XRD analysis showed that the D0₂₂-structure formed only at the lowest concentrations for Ni and Pt, but it was still observed until 20% of Pd content. This was confirmed by SQUID-VSM investigation, but nevertheless the Ni and Pt samples still showed perpendicular magnetic anisotropy at 10% dopant concentration. Magnetizations and coercive fields generally decreased with increasing dopant concentration, as did the perpendicular magnetic anisotropy. At the highest concentration of Ni, a soft ferromagnetic phase formed. For the Pt samples, the L1₀ phase of MnPt formed for higher Pt content.

[1] Kurt et al., Appl. Phys. Lett. 101, 132410 (2012) ;

[2] Balluff et al., Phys. Rev. B 97, 014403 (2018) .