Abstract
The structure and magnetic properties of FePt films with a multilayered structure were investigated. An MgO layer was inserted between the top and bottom FePt layers. From X-ray diffraction patterns (XRD), in addition to a fundamental (002) peak, (001) and (003) superlattice peaks of the L10-FePt phase were clearly observed for all the samples, indicating that an FePt layer can be grown epitaxially on an MgO interlayer. A remarkable step in the magnetization curves in the direction perpendicular to the film plane was clearly observed for the films with an MgO interlayer thickness of more than 3 nm. From an in-field magnetic domain observation, three distinct states of magnetization, corresponding to the step in the magnetization curves, were clearly observed for the FePt(10 nm)/ MgO(10 nm)/ FePt(10 nm) multilayer film. This result is expected to provide fruitful information on multi-level magnetic recording for the future magnetic storage systems.
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