Long-Range Magnetic Interaction and Coercivity Mechanism in Anisotropic La-Nd-Fe-Co-B/Fe Multilayer Thick Films

Abstract

Microstructure, magnetic properties, magnetization reversal process and magnetic interaction in the anisotropic La-Nd-Fe-Co-B/Fe multilayer thick films have been investigated. All the films exhibit a c-axis preferred orientation. By constructing a suitable structure, a multilayer composited thick film with a maximum energy product (BH)max of 14.4 MGOe is obtained, which is increased by 55 % in comparison with a single layer of 6μm La-Nd-Fe-Co-B film. Micromagnetic fitting and first-order reversal curve results reveal that the coercivity mechanism in the thick films is primarily dominated by the nucleation mechanism. Our results are helpful for preparing high-performance thick films that can be directly applied to microelectromechanical systems, providing a guidance for the application of high-abundance rare-earth thick films and balancing the unbalanced utilization of rare earth resources.

Keywords: La-Nd-Fe-Co-B/Fe thick film, magnetization reversal, coercivity mechanism, magnetic interaction