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

doi:10.1016/j.apsusc.2015.09.079

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

^*Corresponding author for this work

Department of Physics

Research output: Contribution to journal › Article › peer-review

24 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 language	English
Pages (from-to)	551-557
Number of pages	7
Journal	Applied Surface Science
Volume	357
DOIs	https://doi.org/10.1016/j.apsusc.2015.09.079
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

Access to Document

10.1016/j.apsusc.2015.09.079

Cite this

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

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.",

keywords = "Surface magnetism",

author = "Hsu, {Hung Chang} and Wu, {Chii Bin} and Hsu, {Kai Lin} and Chang, {Po Chun} and Fu, {Tsu Yi} and Mudinepalli, {Venkata Ramana} and Lin, {Wen Chin}",

year = "2015",

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doi = "10.1016/j.apsusc.2015.09.079",

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AU - Hsu, Hung Chang

AU - Wu, Chii Bin

AU - Hsu, Kai Lin

AU - Chang, Po Chun

AU - Fu, Tsu Yi

AU - Mudinepalli, Venkata Ramana

AU - Lin, Wen Chin

PY - 2015/12/1

Y1 - 2015/12/1

N2 - 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.

AB - 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.

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