| http://www.w3.org/ns/prov#value | - In particular, the average surface roughness (Ra) is preferably in the range of 1???20 ???. [0086] Preferred examples of the material for the non-magnetic base film include Cr, alloys of Cr and Ti, alloys of Cr and W, alloys of Cr and V, and alloys of Cr and Si. [0087] Preferred examples of the material for the magnetic film include Co alloys such as alloys of Co and Cr, alloys of Co, Cr, and Ta;
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