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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic characteristics of RCo13−xSix alloys (R=La, Pr, Nd, Gd, and Dy) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5949-5951 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetism of LaCo13-type alloys such as LaCo13, PrCo13−xSix, etc., has recently received considerable attention as potentially useful magnetic materials. The present study is concerned with RCo13−xSix where R=La, Pr, Nd, Gd or Dy. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362116
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of Fe16N2 in bulk form : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6574-6576 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using molecular beam epitaxy and ion implantation, Japanese workers have formed Fe16N2 in thin Fe films. They report a large magnetic induction for this nitride, ≥2.8 T. In the present study, Fe16N2 has been prepared in bulk form by treating Fe powder with NH3/H2 gas mixtures at temperatures in the range 660–670 °C. The γ phase alloy, which forms under these conditions, was quenched to room temperature to form the α'-Fe-N phase and then heat treated at 120–150 °C to form the α‘-Fe-N phase. The α' phase has been prepared in 80% purity, the other phase being nonmagnetic γ-Fe-N. The α‘ phase has been prepared in 50% purity, the impurity phases being α-Fe and γ-Fe-N. Magnetic measurements give saturation magnetizations at room temperature of 250±10 emu/g (2.6μB/Fe) for the α' phase, 285±10 emu/g (2.9μB/Fe) for the α‘ phase, and essentially zero for the γ phase. Mössbauer measurements confirm that nitrogen austenite is nonmagnetic. The anisotropy of Fe16N2 is small but detectable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356925
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  • 3
    Electronic Resource
    Electronic Resource
    Investigation of Pr-Fe-B magnets with high performance (abstract) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6289-6289 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pr-Fe-B magnets with high performance based on 2:14:1 structure were investigated. The effect of fabricating processes on the oxygen content and on the magnetic properties was studied. The coercivity iHc decreases, but the Br and (BH)max of the magnets increase with the decrease of the Pr content. The decrease in the α-Fe content of the alloys annealed at 1000 °C for more than 360 h results in the enhancement of the magnetic properties of the magnets. Under the optimum conditions, the magnetic properties for Pr14Fe79.5B6.5 magnets are found to be iHc=656 kA/m, Br=1.42 T, (BH)max=374 kJ/m3. The microstructures of the magnets were investigated. The effect of the secondary phases in the grain boundary on the coercivity of the magnets was studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355427
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of cobalt substitution on magnetic properties of R2Fe17 silicides (R=Y, Gd, Tb, Er, and Tm) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6262-6264 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic characteristics and unit-cell dimensions of the (off-stoichiometric) R2Fe17-type alloys based on R2Fe14−xCoxSi2, where R=Gd, Tb, Er, Tm, and Y and x=4 were determined. Partial substitution of Fe by Co slightly increases the saturation magnetization of the alloys and produces an average increase in the Curie temperature (Tc) of 55 K per Co atom. The enhancement of the Curie temperature with the addition of cobalt is attributed to the strengthening of the average 3d-3d exchange interaction. For Er- and Tm-containing compounds, replacement of Fe by Co has a remarkable effect in shifting the observed spin reorientation temperature toward higher temperatures. These results are discussed in terms of the influence of the interaction of the 4f electrons of the rare-earth ions with the 3d electrons of the transition-metal ions, which modifies the overall anisotropy of the alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355418
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  • 5
    Electronic Resource
    Electronic Resource
    Structural and magnetic properties of Tm2−xDyxFe14B and Tm2Fe14−xCoxB alloys systems (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5540-5542 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Structural and intrinsic magnetic characteristics of Tm2−x Dyx Fe14 B (for the entire range of composition) and Tm2 Fe14−x Cox B (for x up to 4) were investigated in detail between 4.2 K and their Curie temperatures. Progressive replacement of Tm by Dy enhances the anisotropy field HA markedly. This was evidenced from the expansion of the uniaxial anisotropy temperature range determined by constructing the magnetic-phase diagram. These results are found to be in very good agreement with the crystal field theory, employing the second-order terms. Addition of Co in the lattice improves the magnetic ordering temperature, but reduces the saturation magnetization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342329
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  • 6
    Electronic Resource
    Electronic Resource
    A novel low-temperature preparation of several ferrimagnetic spinels and their magnetic and Mössbauer characterization (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5641-5643 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ultrafine subdomain particles of NiFe2O4, Ni0.5Zn0.5Fe2O4, and CoFe2O4 were prepared under mild hydrothermal conditions by precipitating from metal nitrates. Magnetic and Mössbauer effect measurements revealed the superparamagnetic nature of these ferrite particles. The crystallite sizes were in the range 5.0–20.0 nm with a very narrow particle size distribution. The magnetic properties and Mössbauer hyperfine parameters of these subdomain ferrite particles are somewhat different from those reported for multidomain bulk materials. The hydrothermal ferrite powders were found to sinter to almost theoretical density with little or no intergranular porosity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342283
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  • 7
    Electronic Resource
    Electronic Resource
    Studies on high-density nickel zinc ferrite and its magnetic properties using novel hydrazine precursors (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3789-3791 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nickel zinc ferrites have been very widely used in the high-frequency applications. In our present study we have prepared Ni1−x Znx Fe2O4 (0≤x≤1) using novel hydrazinium metal hydrazinecarboxylate precursors. High densities (∼99%) have been obtained for all the ferrites sintered at relatively low temperatures, 1100 °C, in comparison with the conventional method (≥1200 °C). The variation of magnetic properties like magnetic moment, Curie temperature, and permeability with zinc concentration have been studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340615
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  • 8
    Electronic Resource
    Electronic Resource
    Prediction of magnetic phase diagrams of selected (RxR'1−x)2Fe14B systems (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3964-3966 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Preliminary experiments on (TmxDy1−x)2Fe14B have suggested the presence of axial, conical and planar regions in the magnetic phase diagram. Here we report the magnetic phase diagram for this and other mixed rare-earth systems, as predicted by second-order crystal field theory. The specific systems considered were those containing (Er or Tm) and (Pr, Tb, or Dy). It is shown that in these systems, which contain two rare-earth ions of opposite second-order Stevens coefficients, the occurrence of all three regions can be accounted for by second-order crystal field theory. The shapes of the phase boundaries are discussed in terms of the stabilization energies of the various rare earth ions. In particular, it was found that the relatively strong temperature dependence of the stabilization energies of Pr and Tm is responsible for low-temperature contractions of the planar and axial phases, respectively. This temperature dependence is attributed to the weaker exchange interaction [(g−1)J〈1] experienced by these ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340564
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  • 9
    Electronic Resource
    Electronic Resource
    Structure and magnetic properties of quaternary Pr2−xRxCo14B (R=Dy and Er) systems and their hydrides (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3972-3974 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single-phase materials of quaternary Pr2−xRxCo14B (R=Dy or Er), which crystallize in the Nd2Fe14B-type tetragonal structure, form for the compositions only up to about x=1.5. Measurements of lattice parameters and the bulk magnetization were carried out on these compounds and their hydrides. Saturation magnetizations Ms, magnetic ordering temperatures Tc, spin-reorientation temperatures Tsr, and anisotropy fields were determined. Pr2Co14B exhibits a transition between uniaxial and planar anisotropy, with increasing temperature. Partial replacement of Dy or Er for Pr in the Pr2Co14B lattice reduces the observed Tsr and HA values. Substitution with Dy in Pr2−xRxCo14B has a smaller effect than with Er. This behavior is believed to be a consequence of a stronger crystal field interaction in the Dy-substituted systems. All materials investigated were found to absorb about 3.5 hydrogen atoms per formula unit at an applied pressure of 10 atm. Introduction of hydrogen into the alloy expands the lattice, changes the magnetic moment of the system slightly and reduces Tsr and HA significantly. This effect is found to be stronger in the Dy-substituted compounds. The weakening of the 4f-3d exchange interactions relative to crystal field interactions of the 4f ions is considered to be responsible for lowering the anisotropy fields upon hydrogen absorption. The results obtained for the host and the hydrides are discussed in terms of their proposed magnetic phase diagram.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340567
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetic properties of MnBi1−xRx (R=rare earth) systems (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6040-6042 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: MnBi crystallizes in a NiAs-type hexagonal crystal structure, exhibits a high uniaxial anisotropy, and is potentially useful as a permanent magnet material. We have examined the effect of partial substitution of Bi with rare earth elements on the magnetic properties of MnBi. MnBi1−xRx (R=Nd, Dy) were prepared by mechanically alloying powders of the constituent elements at liquid nitrogen temperature followed by heat treatment. X-ray diffraction and magnetic measurements were performed on powder samples to characterize the samples. We found that in MnBi1−xNdx, coercivity (at room temperature) increases from 0.7 kOe to 6.6 kOe for x=0.0 and 0.3, respectively. In MnBi1−xDyx the coercivity increases from 0.7 kOe to 7.9 kOe for x=0.0 and 0.3. The increase in coercivity may be in part due to the increase in the crystal field anisotropy as Nd or Dy is introduced and in part due to the finer particle size. A magnet made from MnBi shows coercivity of ∼17 kOe. A very fine particle size is considered to be the reason for this high coercivity. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372605
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