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  • 1
    Electronic Resource
    Electronic Resource
    The microstructural and compositional influence upon HIREM behavior in Nd2Fe14B (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5299-5301 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Enhanced magnetically isotropic properties are observed in melt-spun flakes of the Nd2Fe14B(Si) type. The magnetic enhancement, referred to as HIREM, includes a remanent magnetization equal to 8–9.3 kG (with saturation magnetization measured between 15.2 and 15.7 kG), and an energy product up to 19 MGOe. Both of these properties are significantly above the conventional limits permissible for noninteracting magnetic grains. Microanalysis in an analytical electron microscope (AEM) indicates that there are two requirements for the HIREM phenomenon to arise: (1) a substantial absence of an intergranular phase between the 2-14-1 crystallites, and (2) a specific grain size range. These results support a model for the enhancement resulting from intergrain magnetic exchange coupling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342398
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    High performance isotropic permanent magnet based on Nd-Fe-B (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3577-3579 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have fabricated a macroscopically isotropic permanent magnet material (Ovonic Hi-RemTM) which significantly exceeds conventionally understood performance limits for a material with saturation magnetization Ms =16 kG. Enhanced magnetic properties, including a remanent magnetization Mr =9–10 kG or more, and a maximum energy product in excess of 20 MGOe, are observed without preferred orientation. This material has been fabricated by rapid solidification of an alloy structurally and compositionally similar to Nd2Fe14B, but which depends on critical alloying additions and process parameters to obtain optimum magnetic performance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338706
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Fluorescence extended x-ray absorption fine structure study of silicon in neodymium iron boron rare-earth magnets (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 697-703 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Rare-earth transition-metal magnetic materials consisting of Nd2Fe14B with small amounts of Si, produced by melt-spinning, have been studied using fluorescence extended x-ray absorption fine structure. A windowless Si(Li) solid-state detector was used to collect the Si fluorescence. These polycrystalline samples are unusual in that they are magnetically isotropic, yet have a very high remanent magnetization. The silicon atom is bonded to a single shell of iron atoms at a distance of 2.46±0.05 A(ring). The results strongly suggest that (1) Si does not segregate at the grain boundaries or cluster with other Si atoms, and that (2) Si replaces the iron atom at the "c'' site of the standard Nd2Fe14B structural model within the grains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343424
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    Paper (German National Licenses)
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