Method for determining a materials characteristic value of magnetizable metal bodies by means of a micromagnetic sensor assembly, and corresponding sensor assembly

A method for determining at least one material characteristic of a magnetizable metal body by a micromagnetic sensor arrangement, the sensor arrangement comprising at least one excitation coil having a magnetic core for signal excitation and at least one receiver, the method comprising the following steps:

• magnetizing the body with a current or a voltage excitation via the sensor arrangement, the excitation comprising at least one sign change between a positive part of a half-wave and a negative part of a half-wave, wherein a frequency of the excitation is at least 500 Hz,
• measuring at least one signal in the receiver during the excitation,
• Fourier transforming the at least one signal,
• determining the material characteristic from at least one Fourier component,
• turning off the excitation,
• after turning off the excitation, measuring a post-oscillation of the at least one signal in the receiver, and
• using at least a part of the at least one signal resulting from the post-oscillation in Fourier transforming the at least one signal.