Pt@WS2 -an extrinsic 2D dilute ferromagnetic semiconductor beyond room temperature
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. (This work has been published in Small Methods 2024, 2400955.)
