Magnetic and chemical properties of ultrathin Fe films on molybdenum disulfide (MoS₂) are investigated using magneto-optic Kerr effect (MOKE) and X-ray photoemission spectroscopy (XPS). A magnetization hysteresis loop is found after nominal 10 Å of Fe deposition on MoS₂ at room temperature. The thickness-dependent MOKE measurement evaluates that the magnetic dead layer (MDL) exists up to ≈2 Å of Fe on MoS₂ due to the interaction between Fe and MoS₂. XPS shows small peak shifting for Mo 3d and S 2p peaks toward lower binding energies with initial Fe deposition, indicating the modification of surface band bending. Fe 2p peaks for lower thickness of Fe are significantly broader than those for higher thickness, which is attributed to the coexistence of metallic and ionic Fe in the film. The presence of ionic Fe, localized at the interface, indicates strong interactions between Fe and MoS₂, and the existence of chemical bonding at the interface is corroborated with the formation of MDL.

中文翻译：

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在 MoS2 上生长的 Fe 的界面磁行为和化学状态

使用磁光克尔效应 (MOKE) 和 X 射线光电子能谱 (XPS) 研究了二硫化钼 (MoS ₂ )上超薄 Fe 膜的磁性和化学性质。在室温下在 MoS ₂上沉积标称 10 Å 的 Fe 后，会发现磁滞回线。与厚度相关的 MOKE 测量评估了由于 Fe 和 MoS ₂之间的相互作用，在 MoS ₂上存在高达 ≈2 Å Fe 的磁死层 (MDL) 。XPS 显示 Mo 3 d和 S 2 p峰在初始 Fe 沉积时向较低结合能的小峰位移，表明表面带弯曲的改变。铁 2 pFe 厚度较低的峰明显比较高厚度的峰更宽，这归因于薄膜中金属和离子 Fe 的共存。位于界面处的离子 Fe 的存在表明 Fe 和 MoS ₂之间存在强相互作用，界面处化学键的存在证实了 MDL 的形成。