This question talks about the effect of a ferromagnetic iron bar that changes the magnetic field of a permanent magnet in it's vicinity. I'm wondering if this effect is also present for non-ferromagnetic materials that are metallic, in particular brass. Brass is made from copper and zinc, both of which are diamagnetic, so I'd think the answer is no, but on the other hand this is just a gut feeling...

Case in point: I do have an arrangement for an optical isolator machined from brass with a Terbium Gallium Garnet (TGG) crystal inside and permanent NeFeB permanent magnets (ring shaped) on the outside. I'm wondering if I can take into account the effect of the brass in my simulation of the magnetic field parallel to the crystal inside the brass.


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