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Rare-earth permanent magnet nanomaterials have huge potential applications in different technology areas. This paper reviews the surfactant-assisted ball milling (SABM) technique which can be used to produce rare-earth permanent magnet materials and soft magnetic materials, including nanoparticles, nanoflakes and nanostructured bulk materials. The effects of milling time and temperature on the morphology and magnetic properties of the nanomaterials have been investigated systematically. It has been found that low-temperature ball milling leads to a better control of the nanoparticle morphology produced. On the other hand, surfactants play an important role in the milling process although the mechanism needs to be further studied. © 2015, The Editorial Board of Materials China. All right reserved.
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