Magnetic marker

摘要

A magnetic marker of the invention comprises a magnetic thin wire for generating pulses and soft magnetic materials having a smaller coercive force than the magnetic thin wire, the bodies are arranged close to the two ends of the thin wire. The magnetic thin wire has a diameter of 60-115 mu m and has a ratio of Br/Bs of BH loop of 0.8 or more. Thus, a small magnetic marker can be provided which shows large Barkhausen effect even if it has a very short magnetic thin wire.