| 摘要 |
PURPOSE:To attain the easy recording, reproduction and erasion with use of a small and simple magnetic field impressing means, by controlling the magnetic field of a permanent magnet fixed with a prescribed space a the single side of a recording medium and impressing an external magnetic field. CONSTITUTION:A photomagnetic recording head 3 is set above a photomagnetic disk 1 using a magnetic thin film 2 having the vertical magnetic anisotropy as a recording medium. An external magnetic field impressing means 4 is set under the head 3. The means 4 contains a plate type permanent magnet 22 and an L-shaped core part 23 made of a magnetic substance having high permeability and consisting of a part opposite to a magnetic pole at the side counter to the recording medium of the magnet 22 and a part containing a winding 24. The winding 24 is connected to a current source 20 and a magnetic field is impressed or cut to the recording medium according to the presence or absence of a current applied to the winding 24.
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