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Room temperature normalized M-H loops for (a) sample A, (b) sample B, (c) sample C, and (d) sample D described in Table I. of 7.8 kOe was observed for sample C. The magnetization directions of the bottom and top layers are represented by the two arrows. The field is applied perpendicular to film plane.
Normalized M-H loops for sample A with 10 Å Co bottom layer at different temperatures. The fields and indicated by the arrows represent the beginning and the end of the magnetization reversal of the bottom Co layer. The field is applied perpendicular to film plane.
The exchange coupling field for samples A and C as a function of the temperature.
Details composition of the samples which have been investigated. The bottom and top layers are separated by 8 Å thick Ru. The seedlayer and cap layer are made of a lamination of Ta(50 Å)/Cu(50 Å)/Pd(30 Å) and Pd(30 Å) and Ta(50 Å), respectively.
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