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Sample Geometry and the Accuracy of Reported Sample Magnetic Moment

The accuracy of the reported sample magnetic moment is of great importance, especially when the moment values are used as inputs for further quantitative analysis, such as a Curie-Weiss law fit to the susceptibility vs temperature data, or for comparisons of data obtained from different instruments.

The measurement and fitting process employed by the MPMS 3 to obtain sample magnetic moment means that its accuracy is dependent, among other things, upon the geometry of the sample being measured. Quantum Design has provided the following application note detailing the effect of sample geometry on the accuracy of the measured magnetic moment, and offers a calculator to correct for samples of different geometry.