Abstract
The mean interaction field was calculated for geometrical arrangements of isolated particles representing a longitudinally oriented Ba-ferrite and metal particulate medium. The effective demagnetizing factor was also calculated for a perpendicular Co-Cr recording medium. A positive mean field was obtained for the Ba-ferrite medium because the distance between particles placed in series to the magnetization direction is much shorter than that between parallel particles. When the orientation distribution became broad, the mean interaction field decreased because the location of magnetic particles changed. On the other hand, a negative mean field was obtained for the metal particulate medium. The results suggested that a positive mean field may act in the perpendicular Co-Cr medium.
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