The annealing effects on the magnetic properties, crystallographic structure, and alloy formation, were studied for Co/Pt (111) ultrathin films at coverages up to 6.6 ML, using in situ magneto-optical Kerr effect, low energy electron diffraction, Auger electron spectroscopy, and ultraviolet photoelectron spectroscopy. After the postdeposition annealing in the temperature range of 500–800 K, a significant increase in perpendicular magnetic anisotropy at high coverages and a large enhancement of magneto-optical response with the value about 200%–300% of that before annealing for all coverages investigated are observed. Both findings are shown to be correlated to the formation of a kind of Co–Pt interface (surface) alloy. This is expected to be mainly attributed to the transfer of strong spin-orbit coupling of the Pt into the Co magnetic orbital due to the hybridization during interface alloy formation.
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September 1999
Research Article|
September 01 1999
Giant enhancement of magneto-optical response and increase in perpendicular magnetic anisotropy of ultrathin Co/Pt(111) films upon thermal annealing
M.-T. Lin;
M.-T. Lin
Department of Physics, National Taiwan University, 106 Taipei, Taiwan
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C. C. Kuo;
C. C. Kuo
Department of Physics, National Taiwan University, 106 Taipei, Taiwan
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H. Y. Her;
H. Y. Her
Department of Physics, National Taiwan Normal University, 117 Taipei, Taiwan
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Y. E. Wu;
Y. E. Wu
Department of Physics, National Taiwan Normal University, 117 Taipei, Taiwan
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J. S. Tsay;
J. S. Tsay
Department of Physics, National Taiwan Normal University, 117 Taipei, Taiwan
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C. S. Shern
C. S. Shern
Department of Physics, National Taiwan Normal University, 117 Taipei, Taiwan
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J. Vac. Sci. Technol. A 17, 3045–3050 (1999)
Article history
Received:
March 26 1999
Accepted:
May 19 1999
Citation
M.-T. Lin, C. C. Kuo, H. Y. Her, Y. E. Wu, J. S. Tsay, C. S. Shern; Giant enhancement of magneto-optical response and increase in perpendicular magnetic anisotropy of ultrathin Co/Pt(111) films upon thermal annealing. J. Vac. Sci. Technol. A 1 September 1999; 17 (5): 3045–3050. https://doi.org/10.1116/1.582003
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