> Think of little magnets arranged end to end. NSNSNS etc. Not only do they > attract but the field is cumulative, and as it > get stronger it "convinces" other magnets to align the same way.
Variability of domain pinning strengths (individual domain wall coercivities) is one cause of Sv per Rutherford 1895, as harder-pinned ones give way to the growing induced B of their weaker-pinned neighbors, this process requiring finite time. However, this obvs won't induce a stronger magnetisation density than that of the applied field.. (a feat that might seem to imply coercivity or permeability are going into negative territory) This same point about B-max being a limited function of applied H applies equally to spontaneously-forming dipole chains.. but in a 3D matrix neighboring aligned domains are in cross-feild alignment, like little magnets stacked side-by-side same-end up, hence a mutually-repulsive stressed higher-energy state - not unlike storing elastic potential energy in the intramolecular bonds where these orbitals are aligning; this is part of the input work done against coercivity in ferromagnetic materials, and why the remanance has a Curie point. This is why it's an issue; though it may cost nothing in principle merely to render a force field, if it then performs displacement then work (F*d) is being done, hence runaway self-induction raises free PE. Colour me skeptical anyhoos.
