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Effect of Ag buffer layer to ultrathin Co films on Si(111) surface

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5 Author(s)
Tsay, J.S. ; Inst. of Phys., Acad. Sinica, Taipei, Taiwan ; Yao, Y.D. ; Liou, Y. ; Lee, S.F.
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The magnetic properties of ultrathin Co/Ag/Si(111) films were studied by surface magneto-optic Kerr effect. A magnetic phase diagram for binary-metal Co/Ag films deposited on Si(111) surfaces has been successfully established. The phase diagram can be divided into four regions: nonferromagnetic Co-Si compound; low Curie temperature Co film; canted out-of-plane anisotropy; in-plane anisotropy. The ferromagnetic inactive layers at the Co/Si interface are formed due to intermixing of Co and Si; and can be efficiently reduced by the Ag buffer layer. We have demonstrated that the inactive layer thickness is reduced from 2.1 ML for Co/Si(111), to 1.0 for Co/2.8 MLAg/Si(111), and 0.0 for Co/5.6 MLAg/Si(111)

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Magnetics, IEEE Transactions on  (Volume:35 ,  Issue: 5 )