We have realized perpendicular hard/soft bilayers with exchange-spring behavior, based on FePt-L1/sub 0/ and Fe. Studying the magnetization process as a function of the soft-layer thickness, two different coupling regimes have been identified, i.e., the rigid-magnet and exchange-spring regimes. High values of the maximum energy product (12.4 MGOe) and remanent magnetization (750 emu/cm/sup 3/) have been found in the exchange-coupled bilayers.
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Casoli et al. (2005) studied this question.
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