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 language | English |
---|---|
Pages (from-to) | 551-557 |
Number of pages | 7 |
Journal | Applied Surface Science |
Volume | 357 |
DOIs | |
Publication status | Published - 2015 Dec 1 |
Keywords
- Surface magnetism
ASJC Scopus subject areas
- General Chemistry
- Condensed Matter Physics
- General Physics and Astronomy
- Surfaces and Interfaces
- Surfaces, Coatings and Films