Room-Temperature Ferromagnetic Ultrathin α-MoO3:Te Nanoflakes.
ACS Nano
; 13(8): 8717-8724, 2019 Aug 27.
Article
em En
| MEDLINE
| ID: mdl-31294963
ABSTRACT
We materialized room-temperature ferromagnetism in ultrathin α-MoO3Te nanoflakes. The α-MoO3Te nanoflakes, which had been grown by vapor-phase epitaxy, clearly exhibited an Ag Raman band from symmetric stretching of υ(Mo-O3-Mo) in the 2D-like ultrathin α-MoO3Te layer. Due to the intentional incorporation of smaller Te ions into bigger Mo sites, the pentacoordinated Mo5+ bonds were created inside the orthorhombic α-MoO3Te lattice system. Since Mo5+ ions have magnetic moments from unpaired electron spins, a large number of overlapped bound magnetic polarons could be formed via ferromagnetic coupling with charged oxygen vacancies that are inevitably generated at pentacoordinated [Mo5+O5] centers. This gives rise to the increase in long-range ferromagnetic ordering and leads to room-temperature ferromagnetism in the entire α-MoO3Te solid-state system. The results may move a step closer to the demonstration of spin functionalities in the wide bandgap semiconductor α-MoO3Te.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article