Abstract
In this paper we will discuss Co/Pt and, to a lesser extent, Co/Pd multilayers optimized for magneto-optical storage applications. Perpendicular magnetic anisotropy and square hysteresis loops are achieved for multilayers with a total thickness below about 200 Å if they consist of very thin (≂4 Å) Co layers alternated with 10–20-Å Pt layers. Multilayer made by evaporation show a high coercivity (≳100 kA/m) and have proven to be suitable as magneto-optical recording medium. Recently we showed that Co/Pt layers with high coercivity can be made by sputtering as well, if not Ar but Kr is used as sputter gas.1 We will discuss the properties of Co/Pt multilayers in relation to the preparation technique and will present magneto-optical recording results for both evaporated and sputtered Co/Pt multilayer films. The written domain patterns can be very regular, as observed by scanning magnetic force microscopy, and a CNR as high as 55 dB (1 MHz carrier, 5 m/s, 30 kHz BW) is observed. The good oxidation and corrosion resistance together with increasing Kerr effect towards shorter wavelengths, where higher storage densities are possible, make that Co/Pt multilayers are attractive new magneto-optical recording media.
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