| prov:value
| - As the ferromagnetic powder, there can be used, for example, ??-Fe2 O3 powder, Co-coated ??-Fe2 O3 powder, Co-coated ??-Fe3 O4 powder, Co-coated FeOx (4/3<x<3/2) powder, other Co-containing iron oxides and other ferrites, for example, hexagonal ferrites including M and W types of Ba ferrite, Sr ferrite, Pb ferrite, Ca ferrite and their solid solutions and ion substitution products.
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