Pt@WS₂ -an Extrinsic 2D Dilute Ferromagnetic Semiconductor Beyond Room Temperature

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Extrinsic dilute magnetic semiconductors (DMS) leverage dopant-matrix interactions for magnetic properties.
• The field of 2D DMS is emerging, with potential for novel electronic and spintronic devices.
• Investigating 2D DMS requires materials without intrinsic magnetic impurities.

Purpose of the Study:

• To demonstrate the first realization of an extrinsic 2D DMS.
• To explore the magnetic properties of platinum-doped WS2 (WS2).
• To investigate the underlying mechanisms of magnetism in this novel 2D material.

Main Methods:

• A bottom-up synthesis approach was employed to create Pt-doped WS2 monolayers.
• Experimental characterization confirmed uniform and highly crystalline material structure.
• Theoretical calculations were used to understand electronic and magnetic properties.

Main Results:

• Platinum selectively occupied the tungsten sublattice in the WS2 matrix.
• Orbital overlap between W 4d and Pt 5d states created spin-selective hybrid states.
• A significant valley-Zeeman splitting and ferromagnetic response with a Curie temperature of approximately 375 K were observed.

Conclusions:

• Pt-doped WS2 represents the first extrinsic 2D DMS.
• Tailoring atomic interactions is a viable route to achieve 2D magnetic properties.
• This work opens avenues for spintronics and magnetic nanoactuation applications.