If neutron stars are made of neutrons, how can they have magnetic fields
which require charged matter?

Neutron stars are made of neutrons up to about 96 percent or more of their
composition, but at their outer surface, they have a crystalline structure
consisting of protons and electrons, and it is within this outer 'crust' that
tremendous currents flow to produce the trillion and 1000 trillion Gauss
magnetic fields that were dragged into the collapsing core as the original
star imploded. The name 'Neutron Star' refers to the majority of the particles
in the star, but is not intended to reflect the total composition.
Copyright 1997 Dr. Sten Odenwald
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