Perpendicular Anisotropy and Microstructure of MBE-grown FePt-Ag and FePt-MgO Granular Films

概要

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In order to study the low temperature process to fabricate (001) oriented FePt granular structure, FePt-Ag and FePt-MgO films were fabricated by the repetition process of deposition of Fe40Pt40Ag20 (0.83 nm) or Fe40Pt40(MgO)20 (0.83 nm) alloy layer and subsequent annealing at Ta = 200°C−400°C. The FePt-Ag film showed (001) oriented structure together with rather high ordering parameter of 0.5 even at a low process temperature of 250 °C. The ordering parameter of FePt-Ag was found to be much higher than that of FePt-MgO. The FePt-Ag prepared by the repetition process at 250 °C had well isolated grain structure with diameters of several nm to several tens nm, and showed a large uniaxial anisotropy of 1.0 x 107 erg/cc. The application of the repetition process and Ag addition into FePt was found to be quite effective to fabricate well isolated L10 ordered FePt granular structure at a low process temperature.
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