between several and several tens of micron meters u03bcm because such a width and thickness facilitate its production and ensures an excellent performance in general amorphous alloy can be produced in the form of a thin ribbon having a thickness of 20 to 50 u03bcm so that the magnetic bodies can be produced by cutting such ribbons into segments the amorhous alloy can be produced also in the form of a line having a circular cross section which line may be cut into segments to be used as the magnetic bodies each of the exciting lines 112a to 112i has an upper half part laid on the upper side of the insulating sheet 114 and a lower half part laid in contact with the lower side of the insulating sheet 115 the upper and lower half parts of respective exciting lines 112a to 112i are connected at their adjacent ends to each other in addition the other ends of the lower half parts of the exciting lines 112a 112b 112c 112d 112e 112f 112g and 112h are connected to the other ends of the upper half parts of the exciting lines 112b 112c 112d 112e 112f 112g 112h and 112i.