Some new developments in the field of soft magnetic nanocomposites are reviewed concerning their high temperature and high frequency limit of applicability. Magnetic decoupling temperature gives the temperature limits, which can be best determined through the temperature dependence of the coercive field distribution. The frequency limit can be improved by dimminishing the effective permeability, and the thickness by increasing the resistvity. Examples are given for all these possibilities presenting the stress annealed Finemet, pulse deposited nano-Fe/Fe-oxide multilayers and plasma sprayed bulk amorphous thick layers.
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