MAGNETIC ALLOY RIBBON, LAMINATE AND MAGNETIC CORE

To provide a magnetic alloy ribbon which reduces an eddy current loss in the case of laminated use and further improves magnetic characteristics, a laminate and a magnetic core.SOLUTION: In a case where a concentration of Fe in a depth direction from a first surface of a ribbon is measured, a specific depth where the concentration of Fe reaches 10 at% ranges from 18 nm to 500 nm from the first surface, the concentration of Fe is less than 10 at% from the first surface to the specific depth, and the ribbon includes a positive increase region where the concentration of Fe increases with a substantially positive concentration gradient.SELECTED DRAWING: Figure 2 【課題】積層させて用いる場合に渦電流損失が少なく、しかも磁気特性に優れた磁性合金薄帯、積層体および磁性コアを提供すること。【解決手段】薄帯の第１表面から深さ方向にＦｅの濃度を測定した場合に、Ｆｅの濃度が１０ａｔ％に到達する特定深さが前記第１表面から１８ｎｍ以上５００ｎｍ以下であり、前記第１表面から前記特定深さまでは、Ｆｅの濃度が１０ａｔ％未満であり、Ｆｅの濃度が実質的に正の濃度勾配で増加する正増加領域を有する。【選択図】図２