We fabricated exchange-coupled composite films with perpendicular anisotropy using nanograms of L10FePt as a magnetically hard base layer and FePt : SiO2as a relatively soft phase. The degree of anisotropy and nanostructure in the soft layer was controlled by varying the deposition temperature. Growth of the low-anisotropy layer followed the particulate structure of the base layer at deposition temperatures of 390°C or greater. Perpendicular coercivities were strongly dependent on both the anisotropy and thickness of the softer layer.
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George et al. (2010) studied this question.
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