Origin of exotic ferromagnetic behavior in exfoliated layered transition metal dichalcogenides MoS.sub.2./sub. and WS.sub.2./sub.

Luxa, J.; Jankovský, O.; Sedmidubský, D.; Medlín, R.; Maryško, Miroslav; Pumera, M.; Sofer, Z.

doi:https://dx.doi.org/10.1039/c5nr05757d

Number of the records: 1

Origin of exotic ferromagnetic behavior in exfoliated layered transition metal dichalcogenides MoS.sub.2./sub. and WS.sub.2./sub.

1.

SYSNO ASEP	0471543
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Origin of exotic ferromagnetic behavior in exfoliated layered transition metal dichalcogenides MoS₂ and WS₂
Author(s)	Luxa, J. (CZ) Jankovský, O. (CZ) Sedmidubský, D. (CZ) Medlín, R. (CZ) Maryško, Miroslav (FZU-D)_RID Pumera, M. (SG) Sofer, Z. (CZ)
Number of authors	7
Source Title	Nanoscale. - : Royal Society of Chemistry - ISSN 2040-3364 Roč. 8, č. 4 (2016), s. 1960-1967
Number of pages	8 s.
Language	eng - English
Country	GB - United Kingdom
Keywords	transition metal dichalcogenides ; ferromagnetism
Subject RIV	BM - Solid Matter Physics ; Magnetism
Institutional support	FZU-D - RVO:68378271
UT WOS	000368860900024
EID SCOPUS	84955498365
DOI	10.1039/c5nr05757d
Annotation	Bulk layered transition metal dichalcogenides (TMDs) show diamagnetic properties. When exfoliated, the materials' band gap increases and changes from an indirect band gap to a direct one. During the exfoliation, the TMDs may undergo a phase transition from 2H to 1T polymorph, which is likely electronically driven and accompanied by a metal-insulator transition. A significantly higher efficiency of the exfoliation was observed using sodium naphthalenide compared to butyllithium. Moreover we demonstrate that the exfoliation has a dramatic influence on the magnetic properties of two TMDs, MoS2 and WS2. These materials become partly ferromagnetic upon exfoliation, which is a highly unexpected behavior. Exotic ferromagnetism is generally observed on samples with a high degree of exfoliation, which indicates the association of this effect with defects formed on the edges of dichalcogenide sheets. Such an exotic ferromagnetic behavior, if properly understood and brought under material engineering control, shall open the door to new applications of these materials.
Workplace	Institute of Physics
Contact	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Year of Publishing	2017

Number of the records: 1