Growth, Morphology and Magnetic Behavior of Metallic Deposit on MoS₂
Chuan-Che Hsu1*, Zong-You Lin1, Yi-Hsin Shen1, Po-Chun Chang1, Wen-Chin. Lin1
1Physics, National Taiwan Normal University, Taipei, Taiwan
* Presenter:Chuan-Che Hsu,
In this study, we characterized the the growth, morphology and magnetic behavior of metallic deposit on CVD-fabricated MoS₂ flakes. By Raman spectrum and Atomic force microscopy (AFM), we confirmed that the CVD-fabricated MoS₂ flakes were mostly single layer.
In the first part, we deposited Fe or Au/MoS₂ flakes using e-beam evaporation in an ultrahigh vacuum. The morphology of these sample was characterized by AFM. Both Fe and Au formed nanoparticle array, covering the MoS₂ surface.
The hysteresis loops of 3.6-7.0 nm Fe deposited on the MoS₂ flakes were observed clearly by using magneto-optical Kerr microscopy with the in-plane magnetic field. From the hysteresis curves of individual MoS₂ flakes. The distinct interface magnetic anisotropy of Fe on different substrates, i.e. MoS₂ v.s. SiO₂, could be responsible for the observed magnetic decoupling across the MoS₂ atomic step between Fe/MoS₂ and Fe/SiO₂ domains.
In the second part, we used either Ar-plasma treatment or Ar+ sputtering on MoS₂ surface. These treatments created defects with the depth of few atomic layer on MoS₂ surface.
The defects of MoS₂ surface provide nucleation centers for Fe deposited; thus a strong electronic interaction between Fe and MoS₂ was expected. The magnetic properties of Fe on the two kinds of surface were studied microscopically by Kerr microscope. These observations will be valuable in the future applications combing spintronic and 2D materials.

[1] C.C. Hsu, Z.Y. Lin, P.C. Chang, H.C. Chiu, H.-W. Chen, H.-L. Liu, Francesco Bisio, W.-C. Lin J. Phys. D: Appl. Phys. 50 (2017) 415001

Keywords: MoS₂, Magnetic decoupling of Fe coverage, created defects