Abstract
Nd 6Dy 2Fe 82Co 4B 6 ribbons, prepared by melt spinning, have been investigated by X-ray diffraction (XRD), thermomagnetic analysis (TMA), vibrating sample magnetometer (VSM) and magnetic force microscopy (MFM). XRD and TMA show that the ribbons consist of the α-Fe phase and the Nd 9Fe 14B phase. A high remanence ratio of 0.65 and a relatively high coercivity of 4.9 kOe were achieved in the optimal ribbons. The remanence enhancement is attributed to the exchange coupling between the magnetically hard and the magnetically soft phases. Comparing the MFM image of the optimal ribbon with that of the exchange-decoupled ribbon, we found that the mean magnetic domain size of the optimal ribbon is larger than that of the exchange-decoupled ribbon, which can be attributed to the stronger exchange interaction between grains in the optimal ribbons.
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