Abstract
Magnetic and magneto-optical properties of the TbFeCo(Pt)/Pt multilayers depend sensitively on layer structure. The enhancement of coercivity Hc is found for Pt layer-thickness tPt < 1 A, in which case the Barkhausen volume VB becomes minimum. Pt layers are found to contribute significantly to the Kerr spectra at ultra-violet photon energies beyond 4 eV. The largest enhancement in the Kerr rotation θK takes place at around 5 eV. The maximum value of the difference Δ θK is 0.28 degree at this photon energy. For each TbFeCo layer-thickness tTbFeCo investigated, the θK is enhanced with increasing tPt. In the case of tTbFeCo = 50 A multilayers, the enhancement of both the Kerr rotation θK and ellipticity ηK becomes saturated at tPt = 12 A. This result suggests that Pt atoms up to 6 A from the interfaces are being polarized, giving rise to the higher Kerr activity. The value (tPt = 12 A) is also consistent with the limitation that the Pt layer can be kept amorphous.
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