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CoFe alloys have important applications in recording heads since they have a high MS which enables writing to high coercivity media. They also can have a high coercivity which can hinder applications. Previous studies have attempted to reduce the coercivity by the use of seed layers, process conditions, or lamination. We have used a high target utilization sputtering system that allows control of grain size to study laminated Co35Fe65 films with 15A Al2O3 spacer layers. Samples were fabricated with Ru, Ni81Fe19, and Ta seed layers, as a single layer, a bilayer, or a trilayer. For samples with Ru and Ni81Fe19 seed layers, the grain size was reduced with increasing lamination resulting in a significantly reduced coercivity. Samples with a Ta seed layer showed the opposite trend and an increase of coercivity was found as the number of laminations increased.

Influence of seed layer on magnetic properties of laminated Co65Fe35 films