Research Papers in Physics and Astronomy


Date of this Version

April 1993


Published in Physica Scripta. Vol. T49, 315-321, 1993.


The outlook for improving the energy product of permanent magnets beyond the theoretical limit of 516 kJ/m3 for Nd2Fe14B is discussed. Most promising are nanostructured two-phase magnets consisting of an aligned hard-magnetic skeleton phase possessing exceptionally high uniaxial anisotropy and a soft-magnetic phase which assures a high magnetization. Brown’s paradox is discussed for inhomogeneous magnets, and micromagnetic calculations are used to predict energy products as high as 1090 kJ/m3 in suitable nanostructured Sm2Fe17N3/Fe65Co35 composites, such as multilayers or disordered two-phase magnets with common c axis.

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