Dresden 2026 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 4: Graphene, 2D and Twisted Materials

TT 4.9: Talk

Monday, March 9, 2026, 11:45–12:00, HSZ/0105

Switching Magnetic Anisotropy by Chemical Substitution in Single Crystals of the 2D van der Waals System (Fe_1−xNi_x)₂P₂S₆ — •Yuliia Shemerliuk¹, Anja U. B. Wolter¹, Bernd Büchner^{1, 2}, and Saicharan Aswartham³ — ¹The Leibniz Institute for Solid State and Materials Research, Dresden, Germany — ²Institute for Solid State and Materials Physics and Würzburg-Dresden Cluster of Excellence ct.qmat, TU Dresden, Germany — ³International Center for Interfacing Magnetism and Superconductivity with Topological Matter - MagTop, Institute of Physics, Polish Academy of Sciences: Warsaw, Poland

During recent years, layered quasi-two-dimensional van der Waals materials have attracted considerable attention in fundamental science due to their intrinsic low-dimensional crystal structure, which affects their physical properties. Among these materials, layered thiophosphates M₂P₂S₆ (M= Ni, Co, Fe, Mn, V) stand out as a versatile platform for exploring the interplay between structure and magnetic exchange interactions. In this talk, we will show how chemical substitution and structural tuning influence magnetic ground states in the quasi-2D system (Fe_1−xNi_x)₂P₂S₆. This series combines two structurally compatible parent compounds with fundamentally different magnetic behaviors, interlayer couplings, and ordering temperatures. Our magnetization measurements on single crystals across the substitution series reveal antiferromagnetic ground states throughout. Importantly, we observe a continuous reorientation of magnetic anisotropy from out-of-plane to in-plane with increasing Ni content.

Keywords: Quasi-two-dimensional van der Waals materials; Magnetic anisotropy; Crystal growth; Chemical Substitution; Magnetic phase tuning