Abstract
Based on a simple micromagnetic approach, the equilibrium magnetic configuration, the inducing field and the magnetic hysteresis in a trilayer magnetic structure with horizontal-perpendicular-horizontal anisotropy are investigated by both analytical derivation and numerical calculation. It is shown that the equilibrium magnetic configuration, the inducing effect, and the behavior of magnetic hysteresis are all strongly dependent on the thickness of intermediate defect layer, as well as on the applied field. Interestingly, the magnetic hysteresis shows characteristic shape of soft magnet even though the host matrices are composed of hard magnetic materials. Furthermore, the coercive field Hcoer always increases with the thickness of interlayer, but does not approach saturation. The results are compared with the previous data reported for a trilayer structure having perpendicular-horizontal-perpendicular anisotropy studied by Yorozu and Hu. The pronounced difference can be found in both circumstances due to the different arrangement of magnetic trilayer systems.
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