Abstract
The magnetic properties of L10-FePt/Fe exchange-coupled composite (ECC) nanodots were investigated by Hall effect measurement due to its high sensitivity. The FePt/Fe nanodots showed coercivity changing irregularly with respect to the Fe thickness, which deviated from the simulated results, where the coercivity of the ECC dots reduced with increasing Fe soft layer thickness. It was found that the edge damage induced by ion milling affected the coercivity of the nanodots significantly and the magnetization reversal mechanism. Domain wall nucleation and propagation was revealed in the FePt single domain dots. In the FePt/Fe ECC nanodots, the magnetization gradually reversed from the out-of-plane direction towards the in-plane direction before switching to the reverse out-of-plane direction. The critical size of single magnetic domains in the FePt/Fe ECC nanodots increased with increasing Fe soft layer thickness.
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