Study of magnetization reversal in hybrid magnets

A study of magnetic interactions and magnetization reversal at room temperature in hybrid magnets consisting of micrometrics particles of strontium ferrite and Magnequench MQP-Q alloy was carried out. Materials with three different compositions were considered. These materials present different intensity of coupling between their components. In each case, the evolution of the DCD reversible (M-rev) and irreversible (M-irr) magnetization components during the magnetization and the demagnetization processes was determined. M-rev(M-irr)(Hi) curves were built, being H-i the internal field of the sample. In order to investigate the nature of the magnetic interactions between the different grains, a study of the deltaM(d)(H-i) plots was developed. The experimental behavior of the M-rev(M-irr)(Hi) curves suggest the existence of a complex non-uniform mechanism for the magnetization reversal in these materials. The deltaM(d)(H-i) plots shown a notable predominance of the demagnetizing-like magnetostatic interactions. (C) 2003 Elsevier B.V. All rights reserved.