Effect of Pt in TbFeCo on magnetic and magneto-optical properties

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  • Y. Itoh
    Information Storage Materials Laboratory, Toyota Technological Institute, 2-12-1, Hisakata, Tempaku-ku, Nagoya 468, Japan
  • W. P. Van Drent
    Information Storage Materials Laboratory, Toyota Technological Institute, 2-12-1, Hisakata, Tempaku-ku, Nagoya 468, Japan
  • T. Suzuki
    Information Storage Materials Laboratory, Toyota Technological Institute, 2-12-1, Hisakata, Tempaku-ku, Nagoya 468, Japan

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<jats:p>The effect of Pt additives in TbFeCo(Pt)/Pt multilayers on magnetic properties and magneto-optical Kerr effect is investigated. The perpendicular magnetic anisotropy Ku of the multilayer becomes larger (∼2×106 erg/cm3) than that of the TbFeCo(Pt) single layer. Pt layers are found to contribute significantly to the polar Kerr spectra at ultraviolet photon energies beyond 4 eV. The largest enhancement in the Kerr rotation θK is found at about 5 eV. The Kerr rotation θK and ellipticity ηK are enhanced with increasing Pt layer-thickness tPt, and become saturated at tPt=12 Å. This result implies that Pt atoms up to about 6 Å from the interfaces are contributing to the Kerr activity.</jats:p>

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