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  • 1
    Electronic Resource
    Electronic Resource
    Thermal stability of Nb-doped (NdDy)(FeCoAl)B magnets (abstract) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5534-5534 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: To improve the poor thermal stability of NdFeB magnets, we add Dy, Co, Al, and Nb into the magnets with nominal composition (Nd0.9Dy0.1)17FebCo5Al1.7B7Nbx (x=0.3–1.5 at. %). We have measured their Hcj at room temperature. The data of irreversible loss (IL) of open-circuit flux density at different temperatures are also obtained using cylinder samples with L/D=0.7 (P=2). We have also compared the IL of the same sample with different P. The results show that Hcj increases linearly with Nb content in average 4.8 kOe/Nb at. %. The higher the Hcj and/or the longer the sample is, the lower the absolute value of IL is. The IL of sample with x=1.5 at. % and L/D=0.7 is less than 5% even at 150 °C. Nb effectively achieves the thermal stability of the magnets. The SEM has been used to observe the microstructure of the surface and cross section of a typical sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347966
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic properties of sintered Sm2Fe17Ny magnets (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 489-494 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Sintered magnets of Sm2Fe17Ny nitrides, with a density of 6.0–7.4 g/cm3, have been prepared by using an explosion technique. Both crystalline structure and the magnetic properties of Sm2Fe17Ny nitrides were retained in the process. The sintered magnet had a remanence Br=0.83 T, an intrinsic coercivity μ0iHc=0.57 T and an energy product (BH)max=88 kJ/m3. The temperature dependence of coercivity and remanence were also measured. The temperature coefficients α of remanence and β of coercivity are −0.076%/°C and −0.51%/°C, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355258
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  • 3
    Electronic Resource
    Electronic Resource
    Susceptibility and magnetization processes in Sm2Fe17N3 powders (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 6385-6390 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low field ac susceptibility and magnetization curves of milled Sm2Fe17N3 powders are measured for isotropic and aligned samples with average particle sizes ranging from 3.0 to 52 μm. Most of the particles are in a multidomain state before application of a magnetic field. The transverse ac susceptibility (χ⊥ac∼0.08) due to magnetization rotation against the anisotropy field is independent of particle size. The parallel ac susceptibility χ(parallel)ac and the susceptibility of isotropic powders are dominated by almost free domain wall movement in multidomain particles for which 〈χ〉=1.35. In very low fields (〈0.5 mT) χ(parallel)ac is small (∼0.1), but it increases toward a constant value of order 1 when the field exceeds a value of order 1 mT which is inversely proportional to the particle size. There is a corresponding increase in loss angle which is attributed to weak pinning of domain walls at surface defects. The volume fraction of single-domain and multidomain powder are deduced as a function of average particle size both in the unmagnetized and remanent states, from an analysis of high-field magnetization curves on isotropic powder. For example, about 87% of the volume of powder with an average size of 6.7 μm is multidomain in the unmagnetized state, but only 43% of the volume is multidomain in the remanent state. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363638
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  • 4
    Electronic Resource
    Electronic Resource
    Alternating current susceptibility study of Dy2Fe17−xGax compounds : The 7th joint MMM-intermag conference on magnetism and magnetic materials (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 7145-7147 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of Ga substitution for Fe in Dy2Fe17−xGax on the low field ac susceptibility is reported. The easy magnetization direction is along the c axis for x〉6.3 while for x〈6 it is within the basal plane. With decreasing temperature a spin reorientation from an easy axis to an easy cone takes place when 6≤x≤6.3. Two other anomalies have been found in the susceptibility of easy plane materials when the field is applied in the plane: (i) at T near room temperature, both χ′ and χ″ depend on the frequency and χ″ shows a maximum which shifts to higher temperatures with increasing frequency; (ii) at low temperatures an increase in χ′ is accompanied by time varying effects. While the latter is related to the domain structure reconstruction due to a change of the in-plane anisotropy, the former is caused by thermally activated domain wall pinning and depinning. The Ga substitution strongly affects the low temperature anomaly which disappears when x〉2, whereas it has little effect on the high temperature one. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367660
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic moment and hyperfine field on Fe sites in RFe6Sn6 compounds : The 7th joint MMM-intermag conference on magnetism and magnetic materials (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 6983-6985 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electronic structure and hyperfine fields are calculated for antiferromagnetic YFe6Sn6 using the linear muffin-tin orbital method. The results show that Fe atoms have a strong ferromagnetic character with a full majority-spin band. The Fe moment is 2.2 μB while the Fermi contact term contributes a hyperfine field of 20 T at the natural lattice parameters. The hyperfine field is close to the experimental value of 22 T measured at low temperature. The calculation shows that the core s electrons contribute 24 T to the hyperfine field, but the 4s electron contributes 4 T in the opposite direction. Calculations using different unit cell volumes reveal that only the core electron contributions to the hyperfine field are proportional to the Fe magnetic moment with a conversion factor of 11.8 T/μB; the 4s contribution is not. The large local Fe moment and small hyperfine field are similar to those found in Fe2P and FeO. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367852
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