Presentation Information
[1P12]Ag-stripe formation on the Ni(110) surface
*Aoi Mizuhara1, Tsuneo Fukuda1, Kenji Umezawa1 (1. Osaka Metropolitan University)
The synthesis of novel two-dimensional (2D) materials has gained attention for applications in catalysis, electronics, and spintronics. This study investigates the early growth of silver (Ag) thin films on Ni(110) in an immiscible Ag–Ni system, less explored compared to Ni(111) and Ni(100). Using scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED) under ultra-high vacuum, Ag coverages of 0.4–1.5 monolayers (ML) were examined at temperatures from room temperature to 400°C. Stripe-like structures formed along [001], composed of one-dimensional Ag clusters between Ni atomic rows in [–110]. Partial Ni substrate exposure persisted after further Ag deposition, indicating poor wetting. First-principles calculations revealed instability of clusters longer than seven atoms due to lattice mismatch, leading to edge atom detachment. A low migration barrier (~0.5 eV) facilitates atomic diffusion and second-layer growth. Metastable 3×9 or tilted structures appeared at low temperatures. These findings shed light on heteroepitaxial growth mechanisms in immiscible metal systems on low-symmetry surfaces.