Thanks, Tim. +1. Before I commented, I checked my view by reading this from Feynman. I doubled back through again and although I can imagine tiny atomic current density (or a portion assigned to \$j_{_\text{mag}}\$) having short times (high frequency), the atomic level just doesn't accumulate. Much cancels out there. It's more at larger aggregate levels with exterior surfaces, where these do not cancel entirely, that ferromagnetism occurs. So I'm still struggling to see that time constant getting where it needs to be. But, eh, I'm an idiot.
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