Hard Magnetic Properties In Isotropic Nanocomposite Prye(14)B/Alpha-Fe Ribbons

We have studied the demagnetization behavior for melt-spun nanocomposite Pr8Fe87B5 ribbons in this paper. We have defined H-ex which reflects the magnetic hardening of alpha-Fe and H-irr which expresses the irreversible reversal of magnetic hard phase. It is found that magnetization behavior can be well described using H-ex and H-irr. A magnetic single-phase behavior is observed as H-irr approximately equals to H-ex. Remanence enhancement is not only determined by the intergrain exchange coupling but also dominated by the anisotropy of Pr2Fe14B phase. To achieve a high energy product (BH)(max), the ideal microstructure is discussed. The magnetic reversal in the ribbons is mainly controlled by inhomogencous pinning of nucleated type. (C) 2003 Elsevier Science B.V. All rights reserved.