Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 36: Spin-Dependent 2D Phenomena
MA 36.5: Talk
Wednesday, March 18, 2020, 16:30–16:45, HSZ 101
Enhancement of Curie temperature in Mn5Ge3 films — •Yufang Xie1,2, Ye Yuan1, Hannes Simon Funk3, Chi Xu1, Manfred Helm1,2, Shengqiang Zhou1, and Slawomir Prucnal1 — 1Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden Rossendorf, Dresden 01328, Germany — 2Technische Universität Dresden, Dresden 01062, Germany — 3Institut für Halbleitertechnik , Universität Stuttgart, Stuttgart 70569, Germany
We report the effects of strain on the structural and magnetic properties of epitaxial Mn5Ge3 on Ge/Si (111) substrate by applying ms-range flash lamp annealing (FLA). The X-ray diffraction results demonstrate that during the FLA process the formation of nonmagnetic secondary phases of Mnx*5Gey*3 is fully suppressed but the layer becomes strained. The temperature-dependent magnetization results indicate that the Curie temperature of Mn5Ge3 increases from 280 K up to 400 K with increasing annealing temperature. The biaxial strain generated in Mn5Ge3 during ms-range FLA modifies the distance between adjacent Mn atoms, which provokes the different ferromagnetic interaction between them. Consequently, the significant increase of Curie temperature is observed.