Structural and magnetic properties of laminated (Nd,Dy) (Fe,Co,Nb,B)5.5 Fe nanocomposites are investigated. Normally, the addition of the soft phase to the hard phase enhances the remanence but deteriorates the permanent-magnet performance of the material by reducing the coercivity. In the present system, the coercivity increases to 1608 kAm (20.2 kOe) in thermally processed Nd-Dy-Fe-Co-Nb-B (15 nm) Fe (4 nm) multilayered nanocomposites, which is higher than that of the single-layer hard-magnetic film. The abnormally high coercivity is achieved by annealing at relatively high temperature, which breaks the laminated structure of the as-deposited multilayer. A likely physical explanation of the enhanced coercivity is the introduction of the domain-wall pinning sites that counteract the inevitable decrease of the nucleation field.
ASJC Scopus subject areas
- Physics and Astronomy(all)