Abstract
L11 type CoPt superstructure, a rhombohedral meta-stable phase, thin films with different thickness (t) were sputtered on glass, Pt/glass, and MgO(111) substrates. Perpendicular magnetic anisotropy (PMA) is obtained as the CoPt films, which are deposited on Pt(111)/glass and MgO substrates. The coercivity (Hc) of CoPt/Pt/glass is higher than that of CoPt/MgO(111) film due to the smaller lattice misfit at CoPt/Pt interface and domain wall impedance at CoPt grain boundary. For the CoPt/Pt/glass and CoPt/MgO films, Hc usually increases with reducing the t from 50nm to 5nm. This result could be attributed to the roughness effect at CoPt/Pt and CoPt/MgO interfaces. Without Pt underlayer, CoPt thin film exhibits soft magnetic phase on glass substrate. In this study, higher Hc of about 141kA/m is shown on 3nm-thick CoPt film on Pt/glass. The improvement of perpendicular magnetic properties are obtained by replacing the MgO(111) with Pt/glass, inducing high potential of L11 CoPt in future applications.
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