Abstract
The nature of coupling among the L10 FePt hard and FexB (x=2,3) soft magnetic phases in FePtB nanocomposite thin film magnets is investigated by measuring the hysteresis loops and δM (Henkel) plots. The FePtB thin films deposited under optimized sputtering conditions are shown to have almost fully exchange-coupled soft and hard magnetic phases, which resulted in good hard magnetic properties [in-plane Hc∼604kA∕m and (BH)max∼95.6kJ∕m3].
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