TY - JOUR
T1 - Growth, thermal stability and magnetism of Ni ultrathin films on O-3 × 3/W(1 1 1) surface
AU - Tsai, Cheng Jui
AU - Hsueh, Kun Jen
AU - Plusnin, N.
AU - Kuo, Chien Cheng
AU - Lin, Wen Chin
N1 - Funding Information:
This work was financially sponsored by National Science Council of Taiwan under Grant No. NSC 102-2923-M-003-002-MY3 and NSC 102-2112-M-003-003-MY3 .
PY - 2014/9/15
Y1 - 2014/9/15
N2 - In this study, a well ordered O-3 × 3 superstructure was prepared on a W(1 1 1) surface for the investigation of the growth, thermal stability and magnetism of Ni ultrathin films on it. During the deposition and thermal annealing, Auger signal of oxygen was nearly invariant, indicating that the oxygen played a role of surfactant in this system. Due to the large lattice mismatch between the Ni films and W(1 1 1) substrate (3.95%), Ni underwent an island-growth, which was considerably affected by the growth temperature. After annealing at 500-800 K, the Auger signal ratio of Ni/W significantly decreased to approximately 1, indicating the formation of 3-dimensional islands with a wetting thickness of one pseudomorphic layer. Subsequent annealing to 800-1200 K annealing led to the more serious aggregation, i.e. de-wetting of Ni layer. The 3 and 11.5 PML Ni films revealed a stable canted magnetization, which was possibly attributed to the magneto-elastic anisotropy in the Ni films.
AB - In this study, a well ordered O-3 × 3 superstructure was prepared on a W(1 1 1) surface for the investigation of the growth, thermal stability and magnetism of Ni ultrathin films on it. During the deposition and thermal annealing, Auger signal of oxygen was nearly invariant, indicating that the oxygen played a role of surfactant in this system. Due to the large lattice mismatch between the Ni films and W(1 1 1) substrate (3.95%), Ni underwent an island-growth, which was considerably affected by the growth temperature. After annealing at 500-800 K, the Auger signal ratio of Ni/W significantly decreased to approximately 1, indicating the formation of 3-dimensional islands with a wetting thickness of one pseudomorphic layer. Subsequent annealing to 800-1200 K annealing led to the more serious aggregation, i.e. de-wetting of Ni layer. The 3 and 11.5 PML Ni films revealed a stable canted magnetization, which was possibly attributed to the magneto-elastic anisotropy in the Ni films.
KW - Magnetic anisotropy
KW - Surface magnetism
KW - Ultrathin film
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U2 - 10.1016/j.apsusc.2014.05.180
DO - 10.1016/j.apsusc.2014.05.180
M3 - Article
AN - SCOPUS:84904813023
SN - 0169-4332
VL - 313
SP - 166
EP - 171
JO - Applied Surface Science
JF - Applied Surface Science
ER -