Pt@WS2 -an extrinsic 2D dilute ferromagnetic semiconductor beyond room temperature
Yu-Xiang Chen, Kai-Wen Hsiao, Hao-Ting Chin, Ding-Rui Chen, Zhi-Long Yen, Yann-Wen
Lan, Chu-Chi Ting, Mario Hofmann, Cheng-Tien Chiang, Yang-Hao Chan, Jana Kalbáčová
Vejpravová and Ya-Ping Hsieh*
Small Method
Extrinsic dilute magnetic semiconductors achieve magnetic functionality through
tailored interaction between a semiconducting matrix and a non-magnetic dopant. The absence
of intrinsic magnetic impurities makes this approach promising to investigate the newly
emerging field of two-dimensional dilute magnetic semiconductors. Here we demonstrate the
first realization of an extrinsic 2D DMS in Pt-doped WS2. A bottom-up synthesis approach
yields a uniform and highly crystalline monolayer where platinum selectively occupies the
tungsten sub-lattice. The orbital overlap between W 4d and Pt 5d results in a spin-selective
hybrid states that produce a strong valley-Zeeman splitting. Combined experimental and
theoretical results show that this interaction yields a sizable ferromagnetic response with a Curie
temperature around 375K. Our results open up a new route toward 2D magnetic properties
through tailoring of atomic interactions for future applications in spintronics and magnetic
nanoactuation.
Institute of Atomic and Molecular Sciences Academia Sinica
