Abstract
To elucidate the dependence of exchange coupling behavior of hard/soft magnetic bilayer systems on various micromagnetic constants, the coupling length and the nucleation field HN were systematically measured on five thin-film libraries made of soft magnetic/hard magnetic bilayers. Hysteresis loops of CoPt/FexCo1x 0x1, CoPt/Ni, CoPt/Fe, Sm2Co7/Fe,Co, or Ni, and Sm2Co7/Ni were measured using a magnetooptical Kerr effect setup. The one-dimensional model proposed by Leineweber and Kronmuller J. Magn. Magn. Mater. 176, 145 1997 and micromagnetic simulations were used to interpret the behavior of and HN obtained by the high-throughput investigation. We found that the dominant factors determining and HN are the hard layer magnetic constants and the saturation magnetization M of the soft layer. HN and 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.
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