Date of Award:

12-2022

Document Type:

Dissertation

Degree Name:

Doctor of Philosophy (PhD)

Department:

Physics

Committee Chair(s)

Boyd F. Edwards

Committee

Boyd F. Edwards

Committee

Charles Torre

Committee

Jim Wheeler

Committee

Eric Held

Committee

David Farrelly

Abstract

If you heat up some kinds of metals and then cool them down next to a magnet, they will be a magnet when they cool, but if they cool down away from a magnet, they will just be a lump of metal. This is an example of hysteresis and it’s very important for lots of technology. Another example of hysteresis might be a water tower pump that turns on when the tower is nearly empty and keeps going until the tower is nearly full. Whether or not the pump is on when the tower is half full depends on what the condition of the tower was recently. Hysteresis more generally can be thought of as when somethings present condition depends very strongly on what it’s history was. A counter example would be for a gas, when you know it’s temperature and pressure and volume, that’s all that matters.

Many systems with hysteresis are complicated, but this research has found that some very simple arrangements of the simplest magnets can have still have hysteresis. I show this primarily by looking at how the systems move around their resting position.

This research was funded by an NSF grant.

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