PERMANENT MAGNETIC CIRCUIT, AXISYMMETRIC MAGNETIC FIELD GENERATING METHOD, AND MANUFACTURING METHO

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A magnetic field generating method and a permanent magnetic circuit for, using magnetic field heat treatment, imparting axisymmetric anisotropy in a direction parallel to the substrate to a soft magnetic body, particularly a soft magnetic backing layer for a perpendicular two-layered magnetic recording medium used in perpendicular magnetic recording. In a rare earth permanent magnetic circuit that exhibits hardly any demagnetization at high temperature, a plurality of magnet side faces 95 orthogonal to pole faces 94 are disposed with space therebetween. A magnetic field that is substantially antiparallel to magnetization 91 is generated in the space, and an unprocessed sample is inserted. Further, the permanent magnetic circuit with the unprocessed sample inserted therein is placed in a heat treatment furnace, and the unprocessed sample is rotated 96 as desired.