Estimating demagnetisation factors

What is it about?

The aim is to present useful, applicable and accurate methods for finding the, often overlooked, demagnetisation factor for correction of experimental data. Some of the fairly simple but widely used expressions are compared to numerical modelling in large parameter variation studies. For materials with parameters resembling permanent magnets a very good correspondence is found. In the second part a simple geometrically based method to find the demagnetisation factor is proposed and compared to the numerical modelling results. This method is well suited for quick estimates of the demagnetisation, while e.g. working in the lab. Fairly good correspondence is found indicating the applicability of this simple method.

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Photo by Dan-Cristian Pădureț on Unsplash

Photo by Dan-Cristian Pădureț on Unsplash

Why is it important?

Demagnetisation correction is important but often overlooked. In literature a number of expressions to calculate the corrections are given with varying degrees of complexity. It may be daunting to determine which to use and to what degree the classical, often old, expressions are accurate.