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MA: Fachverband Magnetismus

MA 29: Spin-Dependent Phenomena in 2 D

MA 29.9: Vortrag

Mittwoch, 20. März 2024, 17:15–17:30, EB 202

Ferromagnetic Chromium Telluride Thin Films — Anna Tschesche, Pia Henning, and •Jasnamol Palakkal — Advanced Epitaxy, Institute of Materials Physics, Georg-August-University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

Chromium-based chalcogenides belong to the few 2D materials known for their intrinsic ferromagnetism [1]. Chromium telluride thin films (i.e. Cr₂Te₃, CrTe, CrTe₂) come under this exceptional class having ferromagnetic ground states with different transition temperatures (T_C) and perpendicular magnetic anisotropy (PMA) [2-4].

Being relevant properties for applications such as magnetic random access memory (MRAM) devices, our aim is to find the Cr_xTe_y 2D material with the highest T_C and PMA. We successfully fabricated (0001)-oriented thin films of hexagonal Cr_xTe_y on Al₂O₃ (0001) substrates using our hybrid pulsed laser deposition (PLD) setup, that allows us to vary the Te-content via the temperature of a molecular beam source. All films show strong PMA at 5 K, with an easy axis of magnetization along out of plane direction and the T_C ranges from 155 K to 297 K. Further experiments were conducted and detailed results of the Cr_xTe_y-series will be presented.

[1] S. Yu et al., Science and Technology of Advanced Materials, 23 (2022) 140-160.

[2] Y. Wen et al., Nano Lett., 20 (2020) 3130-3139.

[3] X. Zhang et al., Nature Communications, 12 (2021) 2492.

[4] H. Zheng et al., Appl. Phys. Lett., 122 (2023) 023103.

Keywords: Thin Films; Chalcogenides; Ferromagnetism; Perpendicular Magnetic Anisotropy; 2D materials