Q:

For superconducting inductors, does the "magnetic current" flowing in the ferrite of an inductor suffer from "magnetic resistance"?

In this answer to "Inductor made out of super conductors", the experiences recounted included "ramping up the inductor" or "charging it up".   Absolutely fascinating is the thought of two currents continuously flowing -- the electrical current inside the superconductor, and the magnetic current inside the ferrite.
I know that every normal conductor has an electrical resistance, and that the electrical resistance is mostly removed in the superconducting conductor.
It is my understanding that there is also a "magnetic current" flowing in the ferrite of the superconducting inductor.  (I don't remember where I heard this.)  I know that there are losses involved with changing the amount of that flowing current.  But if the superconducting current is a full short-circuit, and is therefore "holding", that is, maintaining the flow of current without loss, then...
Is there another efficiency loss, similar to electrical resistance, that affects the continually flowing magnetic current, assuming that the magnetic current is not changing at all in magnitude?  Is there magnetic resistance?

This is my guess:  even though I have been told that a magnetized inductor has a magnetic current flowing, the stored magnetic field to me seems more like a coiled spring, not in motion, but yet still "containing" potential energy.  Hence, my guess is that there is no resistance because there is no motion.  The action of compressing or uncompressing the spring is more of a kind of motion that shows a kind of "resistance" in the hysteresis losses, actual crystal deformation if I am right.  What confuses me is the flux, which seems like a flowing fluid.  Please either confirm or correct my concepts of these things. Thank you.

A:

The magnetic field is a vector field that forms loops, but there is no actual "magnetic current" — nothing that "flows" along those loops.
Yes, there is energy (work) associated with changing (increasing or decreasing) a magnetic field, but the only losses would stem from the electrical losses associated with secondary ("eddy") currents in nearby non-superconductors.

