MAGNETIC MEASUREMENT DEVICE

摘要

A magnetic measurement device which measures coercivity and coercivity distribution in a microregion of a thin plate magnetic sample with high coercivity. A magnetic sample is applied with a magnetic field in a first direction and magnetized, a second magnetic field is applied in a direction opposite to the first, a measuring part scans the sample, measuring magnetic flux leakage due to remnant magnetization in the sample. The intensity of the second magnetic field is gradually increased while the measuring part repeats the measurement to obtain the second magnetic field wherein the magnitude of the leakage from the sample reaches the maximum level, and when a magnetic field equivalent to the coercivity is applied to the sample and about half of the magnetization is reversed, the sample's coercivity is obtained based on the determination that the demagnetizing field Hd reaches the minimum level and the leakage reaches the maximum level.

主权项

1. A magnetic measurement device for measuring the coercivity of a magnetic sample, wherein,
said magnetic measurement device comprises: a first magnetic field generating part which applies a magnetic field in a first direction to said magnetic sample and performs a magnetization to substantial saturation, a second magnetic field generating part which applies a magnetic field in a opposite direction opposite to said first direction to said magnetic sample and performs a demagnetization, a measuring part which measures the magnetic flux leakage due to the remanent magnetization of said magnetic sample demagnetized by said second magnetic field generating part, and a coercivity determining part which controls the actions of said first magnetic field generating part, said second magnetic field generating part and said measuring part, obtains the magnetic flux leakages when the magnitude of the magnetic field in said opposite direction is changed sequentially, and outputs the coercivity of said magnetic sample on the base of the magnitude of the magnetic field when said magnetic flux leakage reaches the maximum level.