Berlin 2024 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 36: Poster III
HL 36.29: Poster
Mittwoch, 20. März 2024, 18:00–20:30, Poster E
Proximity-induced exchange field in a 2D magnet/graphene heterostructure detected by the anomalous Hall effect — Maximilian Luka1, Stefan Peterhans1, Matthias Kronseder1, Kenji Watanabe2, Takashi Taniguchi2, Dieter Weiss1, and •Jonathan Eroms1 — 1University of Regensburg, Regensburg, Germany — 2National Institute for Materials Science, Tsukuba, Japan
Since the first observation of magnetic order in 2D materials in 2017, several groups have exploited the properties of these materials, opening up a new field in addition to the vast range of 2D crystals. Materials such as, e.g., Cr2Ge2Te6 (CGT) can be used to induce magnetic properties in single or bilayer graphene due to the magnetic proximity effect. These magnetic exchange fields can be detected by measuring the anomalous Hall effect (AHE). We were able to observe the AHE in a graphene/CGT/hBN-heterostructure. This observation was supported by SQUID-measurements to show the temperature dependence of the magnetization of CGT and its effect on the strength of the AHE. To exclude a trivial stray field effect, we measured the magnetic stray field of several magnetic materials (Fe3GeTe2, CGT) with graphene Hall micromagnetometry, where the 2D magnet was not in direct contact with the graphene layer. The signal detected in this configuration was significantly weaker than the AHE in the proximity-coupled heterostructure, confirming the presence of a magnetic proximity effect.
Keywords: Graphene; 2d Magnet; Anomalous Hall Effect