Materials Issues in Magnetic-Disk Performance
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Materials Issues in Magnetic-Disk Performance Mary F. Doerner and Richard L. White Introduction The continued exponential growth in areal density: for longitudinal magneticrecording devices places ever more stringent demands on disk performance. The design of materials and processes must provide the required advances in technology. The magnetic properties are controlled through the choice of underlayers, magnetic alloys, and the deposition processes that control crystallographic orientation and magnetic isolation between grains. The requirement of lower headdisk spacing places increasing stress on the tribological performance of the disks, controlled by a very thin overcoat and lubricant layer. This article reviews the various materials issues relevant to magnetic-disk technology. The major obstacle for achieving high areal density in thin-film media is transition noise.2 This noise arises from the zig-zag transition boundaries that occur due to cooperative switching of the magnetic grains. 3 Both exchange coupling between grains and magnetostatic interactions cause magnetic-cluster sizes larger than the grain size.45 The goal is to magnetically isolate the grains and keep the grain size small. As the dimensions of the bit cell shrink, smaller grain size is required to obtain enough grains per bit cell to maintain the required signal-to-noise ratio (SNR).6 In the 10-40-Gbits/in. 2 areal-density range, the issue of thermal stability of small (
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