| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic field applying device which is suitable for setting efficiently a perpendicular magnetic recording layer such as a magnetic disk to be in a random magnetization state. SOLUTION: The magnetic field applying device X1 for setting the perpendicular magnetic recording layer in a recording medium D having a perpendicular magnetic recording layer to be in a random magnetization state, is provided with a plurality of electromagnets 15 for applying a perpendicular magnetic field to the perpendicular magnetic recording layer, wherein the respective electromagnets 15 are provided so as to be able to perform revolution. Preferably, respective electromagnets 15 are provided so that the polarity can be reversed. Also, preferably, respective electromagnets 15 are provided rotatably. COPYRIGHT: (C)2008,JPO&INPIT
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