Method and apparatus for determining Curie temperature distribution of a sample of magnetic material
AssigneeSeagate Technology LLC
InventorsGanping Ju, Jason L Presseky, Roy W. Chantrell, Xiaowei Wu, Xi Chen, Xiaobin Zhu, Yingguo Peng
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Abstract
Determining a Curie temperature (Tc) distribution of a sample comprising magnetic material involves subjecting the sample to an electromagnetic field, heating the sample over a range of temperatures, generating a signal representative of a parameter of the sample that changes as a function of changing sample temperature while the sample is subjected to the electromagnetic field, and determining the Tc distribution of the sample using the generated signal and a multiplicity of predetermined parameters of the sample.
Claims20
A method, comprising:
- subjecting a sample comprising magnetic material to an AC electromagnetic field;
- heating the sample over a range of temperatures;
- generating, by a tester apparatus, 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 the AC electromagnetic field;
- and
- determining, by a processor, a Curie temperature (Tc) distribution of the sample using the generated signal and a plurality of predetermined parameters of the sample.
A method comprising:
- acquiring, by a tester apparatus, temperature dependent AC susceptibility data for a sample comprising magnetic material, the AC susceptibility data comprising an imaginary part of AC susceptibility for the sample;
- and
- determining, by a processor, a Curie temperature (Tc) distribution of the sample based on the acquired data and a plurality of predetermined parameters of the sample.
Dependencies are inferred from the claim text.