Room‐Temperature Ferromagnetism in MoTe2 by Post‐Growth Incorporation of Vanadium Impurities. (1st April 2019)

• Record Type: Journal Article
• Authors: Coelho, Paula Mariel; Komsa, Hannu‐Pekka; Lasek, Kinga; Kalappattil, Vijaysankar; Karthikeyan, Jeyakumar; Phan, Manh‐Huong; Krasheninnikov, Arkady V.; Batzill, Matthias
• Is Part Of: Advanced Electronic Materials. Volume 5:Number 5(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-04-01
• Subjects: 2D materials -- diluted ferromagnet -- dopants -- impurities -- magnetism -- MoTe2; Materials -- Electric properties -- Periodicals; Materials science -- Periodicals; Magnetic materials -- Periodicals; Electronic apparatus and appliances -- Periodicals; 537
• DOI: 10.1002/aelm.201900044
• Languages: English
• ISSNs: 2199-160X

Abstract

Abstract: Post‐synthesis doping of 2D materials is demonstrated by incorporation of vapor‐deposited transition metals into a MoTe2 lattice. Using this approach, vanadium doping of 2H‐MoTe2 produces a 2D ferromagnetic semiconductor with a Curie temperature above room temperature (RT). Surprisingly, ferromagnetic properties can be induced with very low vanadium concentrations, down to ≈0.2%. The vanadium species introduced at RT are metastable, and annealing to above ≈500 K results in the formation of a thermodynamically favored impurity configuration that, however, exhibits reduced ferromagnetic properties. Doping with titanium, instead of vanadium, shows a similar incorporation behavior, but no ferromagnetism is induced in MoTe2 . This indicates that the type of impurities in addition to their atomic configuration is responsible for the induced magnetism. The interpretation of the experimental results is consistent with ab initio calculations, which confirm that the proposed vanadium impurity configurations exhibit magnetic moments, in contrast to the same configurations with titanium impurities. This study illustrates the possibility to induce ferromagnetic properties in layered van der Waals semiconductors by controlled magnetic impurity doping and thus to add magnetic functionalities to 2D materials. Abstract : Modification of functionalities of 2D semiconductors by doping, is desirable for advanced applications. It is shown that vapor deposition of vanadium results in an incorporation of vanadium atoms into the 2H‐MoTe2 lattice. Such doped MoTe2 exhibits room‐temperature ferromagnetic ordering and thus is a promising material for spintronics applications.