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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic properties of new ternary R6Ga3Fe11 compounds (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4841-4843 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Three new rare earth–iron ternary compounds with the La6Ga3Co11 structure (I4/mcm), Pr6Ga3Fe11, Nd6Ga3Fe11, and Sm6Ga3Fe11, are found to be ferromagnetic with Curie temperatures of 320, 397, and 462 K, respectively. Large anisotropies have been observed from the magnetization curves and the anisotropy field is larger than 7 T at room temperature. First-order magnetization processes were observed for all samples throughout the temperature range of 4.2–300 K. Point charge calculations give A20=1070 K a−20 at the 16l site and −283 K a−20 at the 8f site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344754
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of Fe-exchange-field penetration on the residual amorphous phase in nanocrystalline Fe92Zr8 (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 7097-7099 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature dependence of hyperfine interactions has been studied by means of Mössbauer spectroscopy for rapidly quenched amorphous Fe92Zr8 in as-quenched and partially crystallized states. An analysis of the temperature dependence of the mean hyperfine field based on the molecular-field approximation showed that the Curie temperature of the residual intergranular amorphous phase (TCam) is 330±5 K, well above the maximum Curie temperature in amorphous Fe–Zr binary alloys (TC*(approximate)280 K). The difference of TCam−TC* (ΔTCam(approximate)50 K) cannot be attributed to the possible magnetovolume effect in the sample. The difference of ΔTCam could be explained by an enhancement of the molecular field by ∼50 T at 0 K, induced by the Fe exchange field penetrating from the bcc-Fe nanocrystallites. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372942
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  • 3
    Electronic Resource
    Electronic Resource
    Neutron diffraction and Mössbauer study of the magnetic structure of YFe6Sn6 (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6046-6048 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have used time-of-flight (TOF) neutron powder diffraction, and both 57Fe and 119Sn Mössbauer spectroscopy over the temperature range 2–600 K to determine the magnetic ordering mode of the Fe sublattice in YFe6Sn6. The crystal structure is orthorhombic (space group Immm). The Fe sublattice orders antiferromagnetically with a Néel temperature of 558(5) K. The TOF neutron diffraction patterns obtained at 4 and 293 K show that the antiferromagnetic ordering of the Fe sublattice is along [100] with a propagation vector q=[010]. The magnetic space group is IPm′m′m′. This magnetic structure is confirmed by our 119Sn Mössbauer spectra. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372607
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of the spontaneous magnetization in the grain boundary region on the magnetic softness of nanocrystalline materials (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4400-4402 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The relationship between the mean hyperfine field of the residual intergranular amorphous phase 〈Bhf〉 and the coercivity Hc in various nanocrystalline soft magnetic samples has been investigated in order to clarify the effect of the spontaneous magnetization in the grain boundary region on their magnetic softness. Nanocrystalline samples with various 〈Bhf〉 values were prepared by annealing an amorphous Fe91Zr7B2 precursor for periods of 60 s–108 ks, at temperatures of 823–973 K. Hc shows a clear tendency to decrease with increasing 〈Bhf〉 or decreasing volume fraction of the residual amorphous phase. These effects of the residual amorphous phase on Hc are well understood within the framework of our extended two-phase random anisotropy model where both the exchange stiffness constant and volume fraction of the grain boundary phase are relevant to the exchange correlation length. Our results indicate that the exchange stiffness constant of the intergranular region varies as the square of the spontaneous magnetization of the residual amorphous phase. A small exchange stiffness constant on the order of 10−13 J/m is predicted for the residual amorphous phase in the Fe–Zr–B alloy. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369797
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  • 5
    Electronic Resource
    Electronic Resource
    Exchange and crystal-field interactions in R3(Fe,Ti)29 and R3(Fe,Ti)29Ny (R=Nd,Sm) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4622-4624 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A quantitative analysis of the available magnetization data on the R3(Fe,Ti)29 and R3(Fe,Ti)29Ny (R=Nd,Sm) compounds have been carried out. The two R sites of R3(Fe,Ti)29 compounds have opposite signs of their leading crystal-field coefficient A20; namely, A20〈0 for the 4e site (2:17 like) and A20(approximately-greater-than)0 for the 2a site (1:12 like) (site notation is that of the space group P21/c). A R–Fe exchange coefficient of 285±5μ0 and crystal field coefficients A20(2a)=+16 K a−20 and A20(4e)=−25 K a−20 were obtained. The type-II first-order magnetization processes observed in both Nd3(Fe1−xTix)29 and Sm3(Fe1−xTix)29 have been well reproduced: μ0Hcr=2.4 T for R=Nd at 5 K (observed ∼2 T), and μ0Hcr=3.0 T for R=Sm at 4.2 K (∼3.2 T). Based on the bonding charge model, we estimate that the values of A20(4e) and A20(2a) for the fully nitrided 3:29 compounds are A20(4e)=−187 K a−20 and A20(2a)=−184 K a−20. Our calculations show that R3(Fe1−xTix)29Ny nitrides become uniaxially anitsotropic for y≥2 and a maximum room temperature uniaxial anisotropy field of 11.4 T for fully nitrided Sm3(Fe1−xTix)29N4 is predicted which compares well with the experimental values which lie in the range 10.7–13 T. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361683
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  • 6
    Electronic Resource
    Electronic Resource
    Neutron depolarization study of magnetic order in a-FexZr100−x (x=90–93), a-Fe90Sc10 and their hydrides : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6161-6163 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Neutron depolarization measurements have been used to show that ferromagnetic domains exist in a-FexZr100−x alloys for 90≤x≤93, and that these domains are not affected by the ordering of transverse spin components at Txy. Domain sizes decrease from 1.1 μm at x=90, to 0.08 μm by x=93. Measurements in an applied field set an upper limit of ∼50 nm for correlations in the transverse components. By contrast, a-Fe90Sc10 shows no evidence of ferromagnetic order and is confirmed to be a spin glass. Measurements on deuterium-loaded samples show that all of the a-Fe–Zr and a-Fe–Sc alloys studied here are ferromagnetic with Tc's in the range 380–400 K, and domains ∼1 μm in size. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362059
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  • 7
    Electronic Resource
    Electronic Resource
    New rare-earth intermetallic phases R3(Fe,M)29Xn: (R=Ce, Pr, Nd, Sm, Gd; M=Ti, V, Cr, Mn; and X=H, N, C) (invited) : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6138-6143 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: New rare-earth (R), iron-rich ternary intermetallic compounds of the form R3(Fe,M)29 with the monoclinic Nd3(Fe,Ti)29 structure (space group P21/c, #14, Z=2) have recently been shown to form with R=Ce, Nd, Pr, Sm, and Gd, and M=Ti, V, Cr, and Mn. This novel structure is derived from the alternate stacking of Th2Zn17 and ThMn12-type segments and contains two R sites and fifteen Fe(M) sites. Reported Curie temperatures of the 3:29 compounds range from 296 K (R=Ce, M=Cr) to 524 K (R=Sm, M=V). The 3:29 compounds all show improved magnetic properties after interstitial modification with H or N; in particular, room-temperature coercivity has been reported in Sm3(Fe,Ti)29N5, making this compound a candidate for possible permanent-magnet applications. In this article we will review the work carried out to date on the 3:29 compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358333
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetic properties of interstitially modified Nd3(Fe,Ti)29Xy compounds (X=H, C, and N) : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6150-6152 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of light atom intercalation on the magnetic properties of the monoclinic compound Nd3(Fe,Ti)29 have been studied by Mössbauer spectroscopy and thermogravimetric analysis. Maximum contents of 4 nitrogen atoms and 6 hydrogen atoms per formula unit have been achieved, consistent with structural calculations. The associated lattice expansion ranges from 2% in the hydride to 6.5% in the nitride. Attempts to introduce carbon were unsuccessful as the material decomposed rapidly during the reaction. Both hydrogen and nitrogen additions lead to substantial increases in the magnetic ordering temperature, but only the nitrogen leads to an increase in the iron moment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358336
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  • 9
    Electronic Resource
    Electronic Resource
    A 57Fe Mössbauer study of Gd2Fe17−xGaxC2 (x=0−6) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5713-5715 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A 57Fe Mössbauer study of Gd2Fe17−xGaxC2 (x=0−6) has been carried out in order to reveal the effects of Ga substitution on the Fe-sublattice magnetic properties. We have used a simplified fitting model which uses six broadened sextets in the theoretical fit to the spectra of Gd2Fe17−xGaxC2. Our results suggest that the electronic factor plays an important role in determining the Fe magnetism in the substituted R2Fe17-xTx (T=Al,Ga,Si,Ti,...) compounds and their carbides. The average Fe magnetic moment in Gd2Fe17−xGaxC2 varies from 1.99μB for x=0 to 0.94μB for x=5 at room temperature. Therefore, the optimum substituent concentration would be 1≤x≤3 for the substituted R2Fe17−xTx compounds as potential permanent magnet materials. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361847
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  • 10
    Electronic Resource
    Electronic Resource
    Observation of independent iron and rare-earth ordering in RFe6Ge6 (R=Y, Gd–Lu) compounds : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6004-6006 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Mössbauer and magnetization measurements have been used to study magnetic ordering in RFe6Ge6 alloys. The iron sublattice orders antiferromagnetically and TN remains essentially constant across the series at ∼480 K with no evidence of a net magnetization in any of the alloys. For R=Gd−Er, the rare-earth sublattice orders ferromagnetically with Tc's that descend from 30 K at Gd to 3 K at Er. This order is established without affecting the order on the iron sublattice. The large difference in ordering temperatures and the unrelated magnetic structures adopted by the two sublattices indicate that the iron and rare-earth moments are effectively isolated from each other and that they order independently. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362134
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