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The effects of CoFe thickness, Pt thickness, and number of CoFe∕Pt bilayers on the anisotropy and coercivity of [CoFe∕Pt]×n multilayer films have been studied. These parameters are varied in an attempt to deposite [CoFe∕Pt]×n multilayer films with well-defined small perpendicular magnetic anisotropies. Best results were obtained in a [CoFe3Å∕Pt10Å]×5 film with coercivity Hc=42Oe, perpendicular anisotropy Hk=2200Oe, and easy-axis remanence Mr∕Ms=1. Large Pt thickness tends to cause well-defined interfaces thus larger surface anisotropy. Large CoFe thickness and more number of bilayers tend to cause bow-tie shaped easy-axis loops and multiple domain structures.
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Ding et al. (2005) studied this question.
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