Magnetization process in ferromagnetic bilayer with exchange coupling through a pinhole

E. Saitoh, H. Matumoto, T. Nakamura, H. Miyajima

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


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.

Original languageEnglish
Pages (from-to)7215-7217
Number of pages3
JournalJournal of Applied Physics
Issue number10 I
Publication statusPublished - 2002 May 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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