| http://www.w3.org/ns/prov#value | - The lower limit of the thickness is not particularly limited, but the thickness may preferably be 3 microns or more, particularly 5microns or more.In the present invention, the ferromagnetic material forming the magnetic layer may be any type of ferromagnetic materials, provided that it can generally form a magnetic layer of the longitudinal magnetic recording system or the verticalmagnetic record
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