[11a-Z29-1~15] 17.3 Layered materials

▲ [11a-Z29-9] Tunable Curie temperature in two-dimensional chromium telluride films grown by molecular beam epitaxy

〇(D)Yue Wang¹, Masaki Nakano¹, Satoshi Yoshida¹, Hideki Matsuoka¹, Kyoko Ishizaka^1,2, Yoshihiro Iwasa^1,2 (1.Dept. Appl. Phys., Univ. of Tokyo, 2.RIKEN CEMS)

Keywords:2D materials, Transition-metal dichalcogenide, Molecular-beam epitaxy

Material research in ferromagnetism has driven the development of data storage and spintronics. Recently, ferromagnetism in atomically-thin, layered two-dimensional (2D) van der Waals materials have been found on exfoliated insulating ferromagnets Cr₂Ge₂Te₆ and CrI₃. In addition, another pioneering work has been demonstrated on 2D metallic ferromagnet Fe₃GeTe₂, in which the Curie temperature can be tuned up to room temperature by electrostatic gating. Those studies have opened huge application opportunities in 2D spintronics. Combining 2D ferromagnetism with related electronic and optical properties could further provide functionalities in magnetoelectric and magneto-optics fields. Among various 2D materials, transitional-metal dichalcogenides (TMDCs) has been showing great potential in electronic and optoelectronic applications, which makes it one of the most promising candidates. Recent study has also revealed possible room temperature ferromagnetism in VSe₂, while there are still many discussions and enigma on ferromagnetism in TMDCs. We have been focusing on exploring novel properties in TMDC thin films using molecular-beam epitaxy (MBE) method. Recently we succeeded in growing atomically-thin chromium telluride epitaxial thin films on insulating sapphire substrates by MBE and confirmed ferromagnet behavior. In this presentation, we will introduce our growth recipe, then discuss structure and related transport and magnetic properties of those MBE-grown chromium telluride epitaxial thin films.