Method and apparatus for determining Curie temperatures of ferromagnetic materials
AssigneeIndustrial Technology Research Institute
InventorsMing-Sheng Leu, Chorng-Sheng Tsai, Ming-Jhy Jiang, Yng-Jye Yu, Chun-Sien Lin
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Abstract
A method and the instrument associated therewith for determining the Curie points of ferromagnetic materials which display no significant abrupt change in heat absorption around the Curie points thereof by means of a conventional thermal analyzer with externally added facilities to provided an external magnetic field. The abrupt change of heat absorption of the ferromagnetic materials is increased by adding the external magnetic field to increase the magnetic anisotropy energy thereof and to strengthen the spontaneous magnetization thereof.
Claims20
A thermal analyzer for determining the Curie temperature cf a ferromagnetic material comprising:
- a heating means for providing thermal energy to and thus heating a test sample of said ferromagnetic material,
- a supporting means for supporting said test sample in place while being heated,
- a temperature detecting means for detecting the temperature of said test sample while being heated and sending signals comprising information of said detected temperature,
- an interpreting means for receiving said signals sent by said temperature detecting means and interpreting said signals, together with the thermal energy supplied by said heating means and for determining the Curie temperature of said material by detecting an increase in the heat taken in by said material,
- a displaying and recording means for displaying and recording results interpreted and provided by said interpreting means,
- characterized in that said thermal analyzer further comprises a magnetic field generating means which is disposed so that an external magnetic field is provided thereby through said test sample when said test sample is heated within said thermal analyser so as to provide an identifiable and clear Curie point of said ferromagnetic material with said temperature information.
A method of determining the Curie temperature of a ferromagnetic material by means of a thermal analyzer with an external magnetic field comprising the following steps:
- placing a test sample of said ferromagnetic material in a supporting means of said thermal analyzer,
- heating said test sample with a heating means,
- generating said external magnetic field through said test sample with a magnetic field generating means,
- detecting the temperature of said test sample with a temperature detecting means while heating said test sample, and sending out signals comprising information of said temperature,
- interpreting said signals with an interpreting means, determining the Curie temperature of said material by detecting an increase in the heat taken in by said material using said interpreting means, and
- displaying and recording said interpreted signals with a displaying and recording means.
Dependencies are inferred from the claim text.