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Title: Oxygen surfactant-assisted growth and dewetting of Co films on O-3 × 3/W(111)

Following the cyclic heating in oxygen and annealing, an oxygen-induced 3 × 3 reconstruction was found on the W(111) surface. The growth, crystalline structure, thermal stability, and magnetism of Co ultrathin films deposited on the O-3 × 3/W(111) surface were investigated. The Auger signal of the oxygen was always observable and nearly invariant after either Co deposition or annealing, indicating the role of the surfactant played by oxygen. Auger electron spectroscopy and scanning tunneling microscopy measurements revealed the 2-dimensional growth of Co on O-3 × 3/W(111). Following the annealing procedures, the surfactant oxygen was always observed to float on the film surface while the Co film transformed to 3-dimensional islands with a wetting layer. In contrast to the thermodynamically stable wetting layer of 1 physical monolayer (PML) Co on clean W(111) between 700 and 1000 K, the oxygen surfactant led to a reduction of the wetting layer to ≈1/3 PML after thermal annealing. The 6 and 9.6 PML Co/O-3 × 3/W(111) revealed a stable in-plane magnetic anisotropy. A 6-fold symmetry corresponding to the crystalline structure was observed in the in-plane angle-dependent magneto-optical Kerr effect measurement.
Authors:
; ;  [1] ; ; ;  [2] ;  [3]
  1. Department of Physics, National Taiwan Normal University, Taipei 116, Taiwan (China)
  2. Department of Physics, National Sun Yat-sen University, Kaohsiung 804, Taiwan (China)
  3. CNR-SPIN, C.so Perrone 24, I-16152 Genova (Italy)
Publication Date:
OSTI Identifier:
22258728
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 20; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANISOTROPY; ANNEALING; AUGER ELECTRON SPECTROSCOPY; DEPOSITION; HEATING; KERR EFFECT; LAYERS; MAGNETISM; OXYGEN; SCANNING TUNNELING MICROSCOPY; SURFACTANTS; THIN FILMS