PURPOSE:To attain sure readout, replicate, erasure and write by surely generating a negative Bloch line to the chopping end of a minor loop side after the chopping. CONSTITUTION:A minor loop part 1 and a major line 2 are provided to a perpendicular magnetic film 11. Plural minor loops ML having a negative vertical Bloch line -VBL are arranged to the loop 1. A chopping means 4 comprising chopping conductors 4a, 4b is arranged to the side of the line 2 of the loop. The conductors 4a, 4b are energized reversely to generate a perpendicular magnetic field between the conductors in a direction integrating the opposed magnetic walls of stripe magnetic domains constituting the loop ML. Thus, the absolute value of the vertical or horizontal magnetic field component in the magnetic field distribution of the overall magnetic field formed by the conductors 4a, 4b has at least one maximum peak in all the depth in the film 11. Thus, the -VBL is generated.
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