Abstract
Particulate magnetic recording media is widely used to store information in computer memory applications. The media consists of submicron-size gamma iron oxide and alumina particles held together by a binder resin onto a substrate (mylar for floppy disks and aluminum for rigid disks). The electrical properties of media depend on the physical characteristics (like size and shape), dispersion and orientation of iron oxide. Well- dispersed and optimum-sized alumina improvies wear resistance of the relatively soft media. Transmission electron microscopy (TEM), with its excellent spatial resolution, is found to be very useful in analyzing media. Ultramicrotomy can be conveniently used to prepare cross-sections of the media for TEM study The major advantage of ultramicrotomy is that it provides a large amount of uniformly thin area relatively quickly.
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