The [Sm(Co,Cu)5∕Fe]6 multilayer film that was fabricated by annealing Cr[a-(Sm-Co)(9nm)∕Cu(xnm)∕Fe(5nm)∕Cu(xnm)]6∕Cr(x=0–0.75) multilayer has shown good in-plane texture and a high maximum energy product (BH)max of 32 MGOe with a coercivity of 7.24 kOe. The addition of the Cu layer between the a-d-SM-Co6 and Fe layers with optimum thickness increases the coercivity significantly, thereby improving the maximum energy product. The single-phase behavior and the irreversible rotation in the demagnetization process indicates strong exchange coupling between the Sm(Co,Cu)5 and Fe layers.
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Zhang et al. (2005) studied this question.
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