The magnetization process has been investigated for SmCo 5/SiO 2/Fe 19Ni 81 trilayer films, in which the exchange coupling between hard-ferromagnetic SmCo 5 and soft-ferromagnetic Fe 19Ni 81 layers is controlled by the size (1-100 μm in diameter) of a pinhole penetrating the SiO 2 layer. The observed magnetization curve indicates that the magnetization reversal in the SmCo 5 layer consists of a nucleation around the pinhole and the propagation of the domain wall. This can be responsible for the suppression of the coercivity induced by the coupling through the pinhole. Variation of the magnetization curve with the size of the pinhole can be argued from the viewpoint of the simple domain nucleation model.
ASJC Scopus subject areas
- Physics and Astronomy(all)