TEM studies of the magnetic domain structure in HDDR-processed Nd-Fe-B type materials

Oliver Gutfleisch, Rex Harris, Pauline Thompson, AJ McGibbon, John Chapman

    Research output: Chapter in Book/Report/Conference proceedingConference contribution


    Transmission electron microscopy has been employed to characterise the physical and magnetic microstructure of a HDDR processed homogenised Nd12.8Fe69.2Co11Ga1B6 alloy. In addition, the microstructural development during the different stages has been studied by scanning electron microscopy. The disproportionated mixture consists of NdH2+/-x rods embedded in an alpha-(Fe, Co) matrix, very similar in appearance to that of the ternary alloy. The grain size in the recombined material was found to be in the range of 200-800nm. Continuous domains could be observed in thin sections of the alloy over significantly larger areas than that of the submicron grains. In the case of smaller grains, it was observed that the domain walls follow the grain boundaries, whereas in relatively larger grains it could be seen that the walls frequently cut through the grains.
    Original languageEnglish
    Title of host publicationRare-Earth Magnets and their Applications, Vols 1 and 2 - Proceedings of the 14th International Workshop
    PublisherWorld Scientific Publishing
    Number of pages10
    Publication statusPublished - 1996


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