Hard magnetic behaviours of composite materials of the iron nanoparticles and HDDR NdDy-FeCo-B powders

Hard magnetic behaviours of the composite materials (NdDy-FeCo-B)1-xFex prepared by direct mixing of iron nanoparticles with HDDR NdDy-FeCo-B powders have been investigated. With increasing the content of iron nanoparticles in composite materials, the remanence first increases, undergoes a peak and then decreases, whereas the coercivity decreases monotonically. The squareness of the demagnetization curves decreases with increasing content of iron nanoparticles. Meanwhile, a high degree of reversibility in the minor loops along the demagnetization branch in the fields below coercivity has also been observed.