Patent ID: 6879152

Claim:
A magnetic property evaluating system of a sample of a magnetic material comprising: a probe having a magnetic material at a tip portion; means for oscillating the probe at an oscillating frequency; means for controlling a distance between the tip portion of the probe and a sample to be measured; means for supplying a sensing current to the sample of the magnetic material; means for receiving an output signal from the sample and extracting a component of the output signal synchronized with the oscillating frequency; and means for calculating that processes an output signal of the extracting means including calculating a distribution of a magnetic field of the sample to be measured by subtracting an output signal of the extracting means with the probe being scanned in a first state from an output signal of the extracting means with the probe being scanned in a second state, wherein the tip portion of the probe is in tapping contact with a measured surface of the sample to be measured by the means for oscillating the probe in the first state, and wherein the tip portion of the probe is kept in contact with the measured surface of the sample to be measured in the second state.