MAGNETIC AFTEREFFECT AND MAGNETIZATION PROCESSES OF NANOCRYSTALLINE ALPHA-FE ND2FE14B 2-PHASE MAGNET ALLOYS/

Magnetic aftereffect and magnetization process of melt-spun nanostruct ured alpha-Fe/Nd2Fe14B two-phase alloys have been investigated, The he at-treated flakes composed of nanoscaled grain size show enhanced magn etic properties due to the intergranular exchange interaction similar to the exchange-spring behavior, The magnetization shows a logarithmic decay with the elapsed time in a steady field, being consistent with the Barbier plot and analytical results. The activation volume increas es with increasing content of soft iron. The dc-demagnetization remane nce data elucidate the irreversible demagnetization process. The soft iron phase, being responsible for reversible magnetization (M(rev)), e xchange-couples with the hard phase and lessens the M(rev).