Abstract
Nonepitaxial FePt:X films (X=Cu,Au,CuAu) with tunable magnetic properties are fabricated and investigated. Emphasis is on controlling and adjusting the magnetic properties of high-density perpendicular recording media through exchange decoupling and anisotropy. The films are initially deposited as multilayers with the structure [FePt∕X]n and have individual thicknesses from about 0.06to1.1nm. To create an (001)-oriented granular L10 structure, the films are then annealed at temperatures of 600°C for 5min and 550°C for 10min. The data indicate that Cu enters the L10 lattice whereas Au segregates at the grain boundaries and reduces the intergranular exchange coupling. For X=CuAu, we obtain coercivities Hc below 10kOe, and slopes α=(dM∕dH)Hc of about 1. For X=Cu, we find a favorable reduction in Curie temperature and Hc.
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