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Hysteresis loop magnetization of Gadolinium
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[QUOTE="Charles Link, post: 6027367, member: 583509"] A google shows the Curie temperature for gadolinium is ##T_c \approx 293 \, K ##. One comment on your laboratory experiment is that it looks like you only have a couple of different temperatures for data points. Bloch's equation will probably work moderately well, but there is an equation that will likely give a better experimental data fit: See [URL]https://www.physicsforums.com/threads/magnetic-flux-vs-temperature-relationship-in-ferromagnets.923380/[/URL] where a couple of students did a similar type of experiment, using a couple of permanent magnets that have much higher Curie temperatures. (They also had the problem that they didn't collect data points at enough different temperatures).## \\ ## Presumably, the gadolinium sample that you had did not make a permanent magnet, but instead, gave a response approximately proportional to the applied magnetic field, with the temperature dependence of the response obeying an equation similar to Bloch's formula, or this other formula, with the ## \gamma ## exponent. ## \\ ## Your experiment doesn't appear to have measured ##M(0) ## or ## M(T) ##. To get a good curve fit, (basically graphing ## \frac{M(T)}{M(0)} ## vs. ## T ## ), you really need measurements at quite a few different temperatures below the Curie temperature. ## \\ ## In any case, a lab experiment such as this does give the student a reasonably good introduction to the idea of the Curie temperature. [/QUOTE]
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Hysteresis loop magnetization of Gadolinium
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