Sr ferrite-MQP hybrid bonded magnets

摘要

A magnetic interaction and magnetisation reversal study at room temperature in hybrid magnets of strontium ferrite and Magnequench MQP-Q alloy were carried out. The evolution of the DCD reversible (M_(rev)) and irreversible (M_(irr)) magnetisation components during the magnetisation and the demagnetisation processes was determined. M_(rev)(M_(irr)) _(Hi) curves were built, being Hi the internal field of the sample. The experimental behaviour of the M_(rev)(M_(irr)) (Hi) curves suggests the existence of a complex non-uniform mechanism for the magnetisation reversal in these materials. Henkel plots showed a notable predominance of the demagnetising-like magnetostatic interactions. Moving Preisach parameter km was determined. K_m is found to be a function of Hi. The behaviour of this function is discussed.