PURPOSE: To obtain a compact magnetic marker in a short element length yet having large Barkhausen inversion phenomenon by a method wherein the wire diameter of pulse generating magnetic fine wire is within the specific range while a value exceeding specific value is given to the angular ratio of BH loop.
CONSTITUTION: Magnetic bodies 12, 13 having less value than the coersive force of a magnetic fine wire 11 are arranged on both end parts of a magnetic fine wire 11. At this time, it is necessary that these pulse generating magnetic fine wire 11 has wire diameter within the range of 60μm-115μm while the angular ratio Br/Bs of BH loop exceeds 0.8. In order to constitute a high performance magnetic marker, it is required that the dimension of the magnetic film wire 11 is decreased so as to reduce the antimagnetic field, on the other hand, the whole flux amount is increased for reversing magnetization. As for the magnetic fine wire 11 in large wire diameter having the angular ratio exceeding 0.8, it is recommended to adopt an amorphous magnetic fine wire having magnetostriction in absolute value exceeding 1×10-6. Through these procedures, the title compact magnetic marker having high output voltage, high harmonic component according to the large Barkhausen inversion can be obtained.
KAWASHIMA KATSUHIRO
OGASAWARA ISAMU
