Room-Temperature Ferromagnetic Ultrathin α-MoO3:Te Nanoflakes

Dong Jin Lee, Youngmin Lee, Young H. Kwon, Soo Ho Choi, Woochul Yang, Deuk Young Kim, Sejoon Lee

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

We materialized room-temperature ferromagnetism in ultrathin α-MoO3:Te nanoflakes. The α-MoO3:Te nanoflakes, which had been grown by vapor-phase epitaxy, clearly exhibited an Ag Raman band from symmetric stretching of ?(Mo-O3-Mo) in the 2D-like ultrathin α-MoO3:Te layer. Due to the intentional incorporation of smaller Te ions into bigger Mo sites, the pentacoordinated Mo5+ bonds were created inside the orthorhombic α-MoO3:Te 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-MoO3:Te solid-state system. The results may move a step closer to the demonstration of spin functionalities in the wide bandgap semiconductor α-MoO3:Te.

Original languageEnglish
Pages (from-to)8717-8724
Number of pages8
JournalACS Nano
Volume13
Issue number8
DOIs
StatePublished - 27 Aug 2019

Keywords

  • 2D-like layered structure
  • bound magnetic polaron
  • orthorhombic α-MoO:Te
  • room-temperature ferromagnetism
  • ultrathin nanoflake

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