IMPROVEMENT OF MAGNETISM IN AMORPHOUS ALLOY THIN FILM

摘要

PURPOSE:To obtain an iron core which has less iron loss in low frequency band by locally and momentarily melting the surface of an Fe group amorphous alloy thin belt used for the iron core of a power transducer irradiating laser light of the limited beam diameter of 0.5mm. or less and then by rapidly cooling to be solidified in amorphous again. CONSTITUTION:The surface of an amorphous alloy thin belt is melted locally and momentarily, the melted part is rapidly cooled and solidified to be made amorphous again and the iron loss is greatly reduced. In this case, the shape and the distribution of the locally melted part are desirable to be parallel lines or dotted lines and the area and the depth of each melted part are made under the conditions that the melted part and the peripheral part are not made amorphous in the solidification process during heating or after melting. For this reason, when locally melting using laser light, the width of the line of the melted part is made 0.3mm. or less and in the case of dotted lines, the diameter of the spot is made 0.5mm. or less.