The present invention relates to the use of cycloaliphatic diamines as cosolvents for hydrophobic amines in aqueous solution. Such structures can include a semiconductor substrate having a copper layer formed thereon. To correct the bound portion, a set of indexes is used to determine an amount of correction. B: Assuming that a minimum value among distances between the respective magnetic substance convex portions and a funnel is D1, the distance between the ferrite core excluding the plurality of magnetic substance convex portions and the funnel is larger than the distance D1 at any point of the ferrite core.