Surface morphology, magnetism and chemical state of Fe coverage on MoS 2 substrate

Hung Chang Hsu, Chii Bin Wu, Kai Lin Hsu, Po Chun Chang, Tsu Yi Fu, Venkata Ramana Mudinepalli, Wen Chin Lin

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

The surface morphology, magnetism and chemical state of Fe coverage on the surface of molybdenum disulfide (MoS 2 ) were investigated using scanning tunneling microscopy, magneto-optical Kerr effect, and depth-profiling X-ray photoemission spectroscopy (XPS). Fe deposition on the MoS 2 substrate resulted in a nanoparticle array with the particle size ranged few nanometers (∼3±1 nm). For low-coverage Fe deposition <6 ML, nanoparticles were well-separated and long-range magnetic ordering was absent at room temperature. When the Fe coverage was increased, in-plane magnetic anisotropy was observed and the magnetic coercivity increased monotonically. The depth-profiling XPS showed the presence of a pure Fe state without observable chemical shift at the Fe/MoS 2 interface. The XPS measurement of Pd/2 ML Fe/MoS 2 also confirmed the dominance of the pure Fe state at the interface. The increase in Fe coverage changed the morphology from a nanoparticle array to a continuous coverage, leading to the onset of the ferromagnetic ordering and the transition from continuous surface oxidation to a bilayer structure.

Original languageEnglish
Pages (from-to)551-557
Number of pages7
JournalApplied Surface Science
Volume357
DOIs
Publication statusPublished - 2015 Dec 1

Keywords

  • Surface magnetism

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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