Abstract
It is discussed the modeling of hysteresis curves of nanocrystalline exchange coupled NdFeB magnets. The hysteresis was measured with an applied field of 9 T, using a vibrating sample magnetometer with superconducting coil. The demagnetizing curve of the first quadrant of the hysteresis was fitted using the Stoner-Wohlfarth (SW) model with the Callen-Liu-Cullen (CLC) modification. Interaction effects as exchange coupling of Nd2(FeCo)14B phase with the alpha iron phase were determined. The volume fraction of the soft phase can be accounted with the CLC model. Feasible methods for improving the maximum energy product (BHmax) of rare-earth transition metal magnets with the help of the SW-CLC model data are discussed.
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