Estimating Complete Hysteresis Loops Using Excel
Stanley Trout, President, Spontaneous Materials

While we might study major hysteresis loops in school, we almost never see them in actual practice, if we work with rare earth permanent magnets. The fundamental problem is the lack of magnetic field, or the high Hci value of the material, depending on how you approach the problem. But the result is frustrating from either direction. Based on a very simple model, this presentation will discuss a method for estimating the entire major hysteresis loop of a permanent magnet based on just a few data points. Curves generated by the model will be compared to real materials.

Dr. Stanley Trout's professional career spans 45 years, almost evenly divided between the permanent magnet and rare earth industries, holding corporate posts at Molycorp, Magnequench, Hitachi Magnetics, Crucible Magnetics and Recoma. Twenty years ago, Stan started a consulting practice called Spontaneous Materials. In this capacity, he serves clients worldwide finding solutions to technical problems, usually involving permanent magnets and the rare earths. Stan is a registered professional engineer in both Colorado and Pennsylvania, holds a B.S. in Physics from Lafayette College and a Ph.D. in Metallurgy and Materials Science from the University of Pennsylvania.  He is a life senior member of the IEEE Magnetics Society and a member of the UK Magnetics Society.

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