| http://www.w3.org/ns/prov#value | - However, the magnetic substances used in the examples of the reference are a ferromagnetic powder having a major axis length of 0.2 ??m and a ferromagnetic hexagonal ferrite powder having a particle diameter of 0.06 ??m, and the magnetic layer thickness is adjusted to the relatively thick range of 0.39 to 0.45 ??m.
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