Regensburg 2025 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 4: Topological Insulators
TT 4.1: Talk
Monday, March 17, 2025, 09:30–09:45, H33
Magnetotransport measurements on magnetic topological insulator nanostructures fabricated with shadow wall epitaxy — •Jan Karthein1,2, Gion Toehgiono1,2, Max Vaßen-Carl1,2, Taizo Kawano3, Sosuke Otsubo3, Makoto Kohda3, Peter Schüffelgen1,2, Detlev Grützmacher1,2, and Thomas Schäpers1,2 — 1Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany — 2JARA-Fundamentals of Future Information Technology, Jülich-Aachen Research Alliance, Forschungszentrum Jülich and RWTH Aachen University, 52425 Jülich, Germany — 3Department of Materials Science, Graduate School of Engineering, Tohoku University, 6-6-02 Aramaki-Aza Aoba, Aoba-ku, 980-8579 Sendai, Japan
We present a novel way to fabricate magnetic topological insulator nanostructures based on digital alloying and shadow wall epitaxy. The combination of these two techniques allows the preparation of structures in the micrometer and nanometer range without the need for lithography and etching steps on the material under investigation. The magnetotransport properties of micro and nano Hall bars fabricated in this way are investigated at cryogenic temperatures and in high magnetic fields. Different sizes of Hall bars are measured and their magnetic properties are studied. An anomalous Hall effect is observed, indicating the successful preparation of Hall bars based on magnetic topological insulator thin films. The Curie temperature of Hall bars with different widths is extracted and found to be systematically dependent on the dimensions.
Keywords: Magnetic Topological Insulator; Nanostructure; Shadow wall epitaxy; Magnetotransport