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| - The magnetic powder used in other layers includes iron oxide magnetic powder such as ??-Fe2 O3, or Co-containing ??-Fe2 O3 ; and ferromagnetic powder of various types such as Fe, Ni, Co, and metal magnetic powder mainly composed of Fe, Ni, and Co, as exemplified by an Fe--Ni--Co alloy, an Fe--Ni alloy, an Fe--Al alloy, an Fe--Ni--Ni alloy, an Fe--Al--Co alloy, an Fe--Mn--Zn alloy, an Fe--Ni--Zn al
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