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High energy products in exchange-coupled nanocomposite films

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4 Author(s)
Liu, J.P. ; Center for Mater. Res. & Anal., Nebraska Univ., Lincoln, NE, USA ; Liu, Y. ; Skomski, R. ; Sellmyer, D.J.

Several systems of nanocomposite thin films have been prepared by plasma sputtering and heat treatment. By choosing suitable multilayer structures of the as-deposited films and subsequent heat-treatment processes, the nanostructures of the films have been tailored. The thermal processing is the key to control the morphology. Appropriate heat-treatment processes have been found for the systems studied, which result in the desired nanostructures. For the first time a nearly ideal nanostructure with the soft-phase grains embedded homogeneously in the hard phase grains has been obtained for the FePt-Fe1-xPtx(x~0.3) system. Effective intergrain exchange coupling has been realized. As a consequence, high energy products up to 50 MGOe have been achieved

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Magnetics, IEEE Transactions on  (Volume:35 ,  Issue: 5 )