Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 36: Spin-Dependent 2D Phenomena
MA 36.4: Talk
Wednesday, March 18, 2020, 16:00–16:15, HSZ 101
Magnetic Anisotropy and Low Field Magnetic Phase Diagram of the Quasi Two-Dimensional Ferromagnet Cr2Ge2Te6 — •Sebastian Selter1,2, Gaël Bastien1, Anja U. B. Wolter1, Saicharan Aswartham1, and Bernd Buechner1,2 — 1Institute for Solid State Research, Leibniz IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany — 2Institute of Solid State and Materials Physics, Technische Universität Dresden, 01062 Dresden, Germany
All known quasi two-dimensional ferromagnets, such as CrX3 (X = Br, I) and Cr2(Ge,Si)2Te6, exhibit a peculiar temperature dependence of the magnetization under small external fields in the hard plane. Investigating the van der Waals layered compound Cr2Ge2Te6 by magnetization and specific heat measurements under magnetic fields, we find the temperature dependence of the effective magnetic anisotropy as plausible explanation for this unusual behavior.
Based on magnetic temperature-field phase diagrams measured with magnetic fields applied along the magnetic easy axis and in the hard plane, the temperature dependence of the effective magnetic anisotropy constant was extracted and its thermal evolution was compared to the corresponding theory. A qualitative scheme is developed explaining the changes of magnetization direction due to the influence of temperature, as well as strength and direction of external magnetic fields in Cr2Ge2Te6.