Effect of Neutron Bombardment on the Magnetic Properties of Very High Permeability Iron

Abstract
Rings of iron with permeability of about 150 000, after neutron bombardment (1×1018 nvt), show lower permeability and higher coercive force. This effect can be interpreted as due to large defects giving long range internal stresses, or as due to anisotropic defects interacting with the magnetization vector at each point of the specimen.