Fig 1 - uploaded by D. Suess
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(a) Conventional perpendicular recording media. The data layer stores the information vertically.In the black region the magnetization points up in the bright region the magnetization points down. About 30 magnetic grains define a bit. (b) The dark grains are magnetized down, the bright grains are magnetized up. In addition, the soft underlayer, the coil, and the write head are shown.
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... conventional perpendicular recording media the data is stored vertically. About 50 to 100 mag- netic grains store one bit of information (Fig. 1). These grains are not strongly coupled to each other and each grain can point up or down independent on the magnetic orientation of the neigh- boring grains. If the areal density is increased the grain size has to become smaller and smaller in order to keep the number of bits constant (about 50 to 100 grains). However as the grains ...
