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MA: Fachverband Magnetismus
MA 41: Poster III
MA 41.6: Poster
Donnerstag, 20. März 2025, 15:00–17:30, P3
Harnessing Van der Waals CrPS4 and Surface Oxides for Nonmonotonic Exchange Bias in Fe3GeTe2 heterostructures — Aravind Puthirath Balan1, Aditya Kumar1, •Sadeed Hameed1, and Mathias Kläui1,2 — 1Institute of Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Germany — 2Centre for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, 7491 Trondheim, Norway
Due to their atomically flat interfaces, two-dimensional van der Waals (vdW) heterostructures serve as the ideal platform to study interfacial effects like exchange bias. In this study, exchange bias in a vdW heterostructure composed of the antiferromagnetic material CrPS4 and the ferromagnetic material Fe3GeTe2 (FGT) with a naturally oxidized surface layer (O-FGT) is investigated by performing Anomalous Hall measurements. The observed exchange bias in this heterostructure exhibits a distinct and non-monotonic trend as a function of temperature below 140 K, which is attributed to the presence of ferrimagnetic Fe3O4 in the surface oxide layer whose induced exchange bias is modulated by the presence of the antiferromagnetic CrPS4 layer. These findings highlight the multifaceted nature of exchange bias in van der Waals heterostructures and their potential for tailored manipulation and control of material properties.
[1] Puthirath Balan, A. et al., ACS Nano 18, 8383-8391 (2024).
Keywords: 2D magnetism; Exchange bias; Fe3GeTe2; CrPS4; van der Waals heterostructures