The Magnetic Field
The magnetic field is just the electric field that has become warped, when there is relative motion, by the effects explained in the theory of special relativity. Electrons with spin have motion relative everything else.
Overview of How Magnets Work
Hysteresis in the Magnetic Materials
The Magnetocaloric Effect
NOTE: The Magnetocaloric Effect relates to how heat transfers back and forth between random rectilinear motions and random rotational motions. After heat has been transfered to random rotational motions, those motions can have a tendency to seek more ordered states and these are lower energy states with less entropy. The energy excess can be released to useable forms for performing work, like wind energy and lightning in weather systems that involve rotation of water molecules (electric dipoles) or electrical energy output from magnetic/electronic systems that utilize magnetic dipoles.
Magnetism and Magnetic Materials