Fe(001)膜における極磁気および縦磁気Kerrスペクトル

概要

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Magneto-optical polar and longitudunal Kerr effects in bcc-Fe(001) epitaxial films sandwiched between Au(001) layers were studied for Fe thicknesses d_<Fc>=3-1000Å in the pthton energy range of 1.55-6.2eV. The polar Kerr rotation peaks related to quantum well states(QWS)fomed in Fe layer disappeared above d_<Fc>=20Å. In films with d_<Fc>≧100Å, the polar Kerr spectra above 3.5eV were substantially the same as the spectrum of bulk Fe. Below 3eV, on the other hand, a Kerr rotation peak enganced by the plasma edge of Au at 2.5 eV shifted to the lower energy side with the increase of d_<Fc> even above 100Å, and the intensity of the pear exceeded the bulk value around d_<Fc>=100Å. In the longitudinal Kerr rotation spectra the peaks related to QWS appeared nowhere in the whole range of d_<Fc>. This suggests that the contribution of QWS to the off-diagonal complex dielectric tensor element respensible for longitudinal Kerr effect is in our Fe films negligible.
社団法人日本磁気学会の論文
1998-04-15