Abstract
Magneto-optical properties of a stacked-layer structure with perpendicular antiferromagnetically coupled CoPt layers have been investigated under the polar Kerr measurement condition. The stacked layer included an optical cavity that was basically composed of a [CoPt/ZnO/CoPt] trilayer inside the film. It also acted as a magneto-optical cavity under the residual magnetization condition. The enhancement of the residual Kerr rotation was observed by the antiparallel magnetization alignment of the CoPt layers. The enhanced residual rotation angle in the AF sample was greater than the saturation angle of a 5-nm-thick CoPt single film. Moreover, by the finite-difference time-domain simulation, in this system, we demonstrated that a large enhancement of the magneto-optical effect can be anticipated by adopting a two-dimensional photonic crystal structure.
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