Abstract
A Fe 3O 4/L1 0–FePt bilayer thin-film magnet was fabricated via a simple one-step process by annealing Fe/Pt multilayer thin films in a N 2 gas flow. X-ray diffraction and plane-view selected-area electron diffraction results are identified with magnetite phase (Fe 3O 4) and L1 0–FePt. Cross-sectional transmission electron microscopy images show the two phases form a bilayer structure. Magnetic hysteresis loops of the bilayer show single phase behavior which is interpreted as a result of the soft Fe 3O 4 phase exchange-coupled with the hard L1 0–FePt phase, consistent with micromagnetic simulation prediction. Such bilayer structure may have potential for coercivity control in high density magnetic recording application.
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