You have correctly used the term "inertia" here. Looking at mass inertia you know that a sudden application of a force will result in the mass moving at a rate determined by the inertia. I used the word "sudden" meaning a fast rise time of the force pulse. The inertia is not slowing down the force pulse, it still has the same rise time. A current pulse into a capacitor is similar.
"Thermal” is a statistical term, referring to the average agitation of particles, and therefore their kinetic energy. Contrary to what you say, thermal inertia obviously slows down the effects of forces, since electron collisions in the crystal lattice are what average particle agitation, degrading impulse energy by transforming it into thermal energy, which leads to the notion of temperature and determines Curie's point. The example of the capacitor is incorrect: it's impossible to impose an impulse on a capacitor, we're always subject to the time constant t/RC, we can only charge it step by step, exponentially. In the SEMP system we have remanent magnetism decaying at a fast rate. Something is driving that decay and we assume it is thermal. Why do you tie this to thermal capacity when clearly it is not. Thermal force is the driving force and that is not slowed down by thermal inertia.
This question here is related to Curie's point, otherwise the concept becomes banally irrelevant since magnetism can indeed vary rapidly. Without a logic linking this rapidity to magnetic parameters that depend on the Curie point and vary just as rapidly, I really don't see where the new idea lies.
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"Open your mind, but not like a trash bin"
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