Dependence of exchange coupling interaction on micromagnetic constants in hard/soft magnetic bilayer systems

A. J. Zambano, H. Oguchi, I. Takeuchi, Y. Choi, J. S. Jiang, J. P. Liu, S. E. Lofland, D. Josell, L. A. Bendersky

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35 Scopus citations


To elucidate the dependence of exchange coupling behavior of hard/soft magnetic bilayer systems on various micromagnetic constants, the coupling length (λ) and the nucleation field (HN) were systematically measured on five thin-film libraries made of soft magnetic/hard magnetic bilayers. Hysteresis loops of CoPt Fex Co1-x (0≤x≤1), CoPt Ni, CoPt Fe, Sm2 Co7 (Fe,Co, or Ni), and Sm2 Co7 Ni were measured using a magneto-optical Kerr effect setup. The one-dimensional model proposed by Leineweber and Kronmüller [J. Magn. Magn. Mater. 176, 145 (1997)] and micromagnetic simulations were used to interpret the behavior of λ and HN obtained by the high-throughput investigation. We found that the dominant factors determining λ and HN are the hard layer magnetic constants and the saturation magnetization (M) of the soft layer. HN and λ display a direct correlation with the domain-wall width of the hard layer and have an anticorrelation with M of the soft layers. They were found to not be substantially dependent on exchange stiffness (A) and anisotropy (K) constants within the group of soft layer materials studied here.

Original languageEnglish (US)
Article number144429
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number14
StatePublished - Apr 30 2007

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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