Berlin 2024 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 3: Layer Properties

DS 3.8: Vortrag

Montag, 18. März 2024, 17:30–17:45, A 053

Controllable phase transition of two-dimensional ferromagnetic chromium telluride thin films grown by molecular beam epitaxy — •Haili Huang — Shanghai Jiao Tong University

Two-dimensional (2D) Cr(1+δ)Te2 materials exhibit strong magnetic ordering and high Curie temperatures, making them attractive for various applications. However, it is crucial to achieve controllable synthesis for their successful integration into device technologies. In this study, we present the synthesis of phase-controllable 2D Cr(1+δ)Te2 films on the Si (111) substrate via molecular beam epitaxy. The composition and phase transition of the as-grown Cr(1+δ)Te2 films are characterized by using in-situ reflection high-energy electron diffraction, scanning tunneling microscopy, ex-situ X-ray photoelectron spectroscopy, X-ray diffraction, and theoretical calculations. By carefully adjusting the film thickness, we achieve precise control over the phase and growth mode of Cr(1+δ)Te2. These changes are attributed to interfacial effects and the phase stability of Cr(1+δ)Te2 compounds. The magnetic measurements reveal that the 30-nm Cr2Te3 film exhibits ferromagnetic behavior with a Curie temperature of about 180 K. Our work offers a robust method for the controllable growth of high-quality 2D Cr(1+δ)Te2 films on Si substrates, providing an ideal platform for investigating their intrinsic properties and advancing the development of 2D magnet-based spintronics devices.

Keywords: Phase transition; Magnetic films; Molecular beam epitaxy; Scanning tunneling microscopy; Intercalated structure