Method and apparatus for determining curie temperature distribution of a sample of magnetic material

An apparatus, comprising:

• an electromagnetic field generator;
• a heating unit operable for heating a sample comprising magnetic material over a range of temperatures that includes a known mean Curie temperature for the magnetic material of the sample;
• a tester configured to generate a signal representative of an imaginary part of AC susceptibility of the sample that changes as a function of changing sample temperature while the sample is subjected to an AC electromagnetic field produced by the electromagnetic field generator;
• and
• a processor comprising an input for receiving the signal generated by the tester and an output, the processor configured to determine a Tc distribution of the sample using the generated signal and a plurality of predetermined parameters of the sample, the processor further configured to produce a data signal representative of the Tc distribution accessible at the output.