Conference Presentation (After Call)

FZJ-2026-01376

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Magnetotransport measurements on magnetic topological insulator nanostructures fabricated with shadow wall epitaxy

Karthein, J. (Corresponding author)FZJ* ; Toehgiono, G.FZJ* ; Vaßen-Carl, M.FZJ* ; Kawano, T. ; Otsubo, S. ; Kohda, M. ; Schüffelgen, P.FZJ* ; Grützmacher, D.FZJ* ; Schäpers, T.FZJ*

2025

Abstract: 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.

Keyword(s): Information and Communication (1st) ; Condensed Matter Physics (2nd)

---

Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)

Research Program(s):

1. 5222 - Exploratory Qubits (POF4-522) (POF4-522)
2. DFG project G:(GEPRIS)390534769 - EXC 2004: Materie und Licht für Quanteninformation (ML4Q) (390534769) (390534769)
3. DFG project G:(GEPRIS)491798118 - Magnetische topologische Isolatoren für robuste Majorana Zustände (491798118) (491798118)

---