Very thin soft magnetic alloy strips and magnetic core and electromagnetic apparatus made therefrom
AssigneesKabushiki Kaisha Toshiba, Masaaki Yagi
InventorsTakao Sawa, Masaaki Yagi
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Abstract
A thin Co-based amorphous alloy strip is produced, the conditions for production being controlled to those specified by the invention. The thin strip has an extremely small thickness and few pinholes. The extremely small thickness of less than 4.8 .mu.m notably enhances soft magnetic properties such as permeability and core loss in the high frequency range. Additionally, magnetic cores and electromagnetic apparatuses can be produced from the thin Co-based amorphous alloy strips.
Claims14
An extremely thin soft magnetic alloy strip, having a plate thickness of less than 4.8 .mu.m and an alloy composition substantially represented by the formula (Co.sub.1-a A.sub.a).sub.100-b X.sub.b, wherein A is at least one element selected from the group consisting of Fe, Ni, Mn, Cr, Mo, W, V, Nb, Ta, Ti, Zr, Hf, Cu and platinum-group elements, X is at least one element selected from the group consisting of Si, B, P and C, a is a number satisfying 0.ltoreq.a.ltoreq.0.5, and b is an atomic % satisfying 10.ltoreq.b.ltoreq.35.
An extremely thin soft magnetic alloy strip, having a plate thickness of less than 4.8 .mu.m and an alloy composition substantially represented by the formula (Co.sub.1-m-n L.sub.m M.sub.n).sub.100-0 Si.sub.1-p B.sub.p).sub.0, wherein L is at least one element selected from the group consisting of Fe and Mn, M is at least one element selected from the group consisting of Ti, V, Cr, Ni, Cu, Zr, Nb, No, Hf, Ta, W and platinum-group elements, m is an atomic ratio satisfying 0.03.ltoreq.m .ltoreq.0.14, n is an atomic ratio satisfying 0.ltoreq.n.ltoreq.0.10, p is a number satisfying 0.2.ltoreq.p.ltoreq.1.0, and o is an atomic % satisfying 20.ltoreq.o.ltoreq.35.
Dependencies are inferred from the claim text.