Abstract
The material requirements of circular cylindrical domain devices are discussed. The current status of the search for circular domain materials is summarized with respect to the anisotropy field H <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">k</inf> and the saturation magnetization M <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">s</inf> by a chart showing the influence of these quantities on the size, stability and mobility of the circular domains. A preferred region is defined on the chart and representative materials are plotted. At the present time, the preferred region is most closely approached by certain mixed rare-earth orthoferrites and the aluminum substituted hexagonal ferrites.
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