Temperature of Magnets
Sophomore Material Science Project
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The objective of this project was to determine the Curie Temperature of permanent neodymium magnets.
The Curie Temperature or Curie Point is the temperature at which a material loses certain magnetic properties.
The image on the left shows the experimental setup: The permanent magnet is exposed to a heat source while it's temperature is measured by a thermocouple. A magnetic field sensor is insulated by a ceramic tile and measure magnetic flux. The thermocouple and the magnetic field sensor each produce a change in voltage that is interpreted by an Arduino microcontroller.
After testing 5 identical magnets, the measured Curie Temperature was determined to be between 120 and 160° C. The accepted value of the Curie Temperature for Neodymium is 320 °C.
It was later discovered that the magnets used were not pure neodymium, but had a mixture of nickel and ceramic.
To determine if the test setup is valid, the Curie Temperature of pure neodymium would have to be tested.
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