Insulation - material, substance or spacing, which provides a barrier impeding a flow of energy between two parts of a given system. The insulation depends on the type of energy which needs to be impeded: electrical, thermal, acoustic, etc.1)
There are no known materials which could be used as a magnetic insulator for static magnetic field conditions, at room temperature. However, there are various materials which can be used to shunt or direct magnetic field away from a given volume of interest (magnetic shielding), oppose the presence of varying magnetic field (superconductors), reflect electromagnetic waves (electromagnetic shielding), etc.
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