INFLUENCE OF γ AND NEUTRON IRRADIATION ON THE MAGNETIC PROPERTIES OF NdFeB, ALNICO AND MnAl TYPE PERMANENT MAGNETS

摘要

The influence of γ and neutron irradiation on the magnetic properties of NdFeB, Alnico and MnAl type permanent magnets was studied. With the used neutron energies and fluences, no changes in remanent induction values for NdFeB type permanent magnets are-shown. For Alnico type permanent magnets the remanent induction changes are due to reversible variation of the magnetization directions. Only in case of MnAl type permanent magnets irreversible structural changes take place, which lead to irreversible losses of induction.