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" ... Now, let's go a step further. Instead of a uniform, perfect diamagnet, let's imagine we have one with impurities inside of it. If you then cool your material down below the critical temperature and change the magnetic field inside of it, those interior magnetic fields still get expelled, but with an exception. Anywhere you have an impurity, the field remains. And because it cannot enter the expelled region, those field lined get pinned inside the impurities. ... "