Anisotropy and coercivity analysis of Fe/MnPd bilayers

We present the detailed studies of the exchange bias effect,the coercivity and the enhanced coercivity of exchange bias bilayer Fe/MnPd, both experime ntally and theoretically. We have,so far as we know for the first time,demo nstrated that the existence of large higher order anisotropies due to excha nge coupling between different Fe and MnPd layers can account for the large increase of coercivity in Fe/MnPd system,The linear dependence of coercivi ty on inverse Fe thickness can be well explained by a phenomenological mode l by introducing higher order anisotropy term into the total free energy of the system.