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

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

20 引文 斯高帕斯(Scopus)

摘要

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.

原文英語
頁(從 - 到)551-557
頁數7
期刊Applied Surface Science
357
DOIs
出版狀態已發佈 - 2015 十二月 1

ASJC Scopus subject areas

  • 化學 (全部)
  • 凝聚態物理學
  • 物理與天文學 (全部)
  • 表面和介面
  • 表面、塗料和薄膜

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