Abstract
Designing supraceramic assemblies based on Al 2O 3 has remained a challenge due to the problems associated with the suitable dispersion in neat compounds and ability to control the preferred orientation in a unique fashion. Herein, granular HCP-(CoCrPt) 100− X (Al 2O 3) X ( X represents the percent weight) thin films with Si(1 0 0) substrates have been fabricated using sputtering technique followed by annealing treatment. Structural and magnetic properties of thin film have been investigated for potential application in magnetic recording media. It was shown that coercivity increased from 0.5 to 2.5 kOe by increasing the nano-grain Al 2O 3 content in the CoCrPt magnetic layers. In CoCrPt-Al 2O 3 thin films coercivity of 2.5 kOe has been obtained with increasing the Al 2O 3 content from 3 to 13 wt.% in the annealed thin films. The structural properties of the samples were studied using X-ray diffraction (XRD) and transmission electron microscope (TEM) equipped with selected area electron diffraction (SAED). The magnetic properties of the samples were measured with a vibrating sample magnetometer (VSM). The VSM results showed that the HCP-CoCrPt-Al 2O 3 granular films are a promising candidate for ultra-high-density recording media because of its low Al 2O 3 content and simple manufacturing process.
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