| http://www.w3.org/ns/prov#value | - As the material of the pole portion layer 13A, for example, a material including iron and nitrogen, a material including iron, zirconia and oxygen, a material including iron and nickel, and the like are cited, and more specifically, at least one kind selected from the group consisting of Permalloy (Ni: 45%, Fe: 55%), iron nitride (FeN), an iron-cobalt alloy (FeCo), an alloy including iron (FeM), a
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