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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic properties of Sm2Fe14−xCoxSi2-based quasiternary compounds : 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. 6156-6158 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structural and magnetic properties of the off-stoichiometric R2Fe17-type Sm2Fe14−xCoxSi2 compounds with 0≤x≤7 have been investigated by x-ray diffraction, thermomagnetic analysis, and magnetic measurements. Substitution of Co for Fe leads to an increase in Curie temperature, ΔTc=303 K for samples with x from 0 to 7. The saturation magnetization Ms increased with increasing Co content at first and then decreased. A maximum saturation magnetization Ms=124 emu/g was obtained at x about 4. The anisotropy changes from planar x〈4 to uniaxial x≥4 with Ha=23 kOe for x=7. Introduction of N leads to an increase in lattice constants causing a further enhancement in the Curie temperature and anisotropy field. The best properties were obtained for the Sm2Fe10Co4Si2N2.3 compound with Tc=742 K, Ha (300 K)=175 kOe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358339
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic properties of (Er,R)2Fe17Ny compounds (R=Y,Gd) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6238-6240 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Structural and magnetic properties of the interstitial (Er1−xRx)2Fe17Ny compounds with R=Y and Gd, x=0, 0.1, 0.25, 0.4, 0.5, 0.6, 0.75, and 1.0, 2〈y〈3, have been investigated. All the parent compounds crystallize in the Th2Ni17-type structure, except for Gd2Fe17 which crystallizes in the Th2Zn17-structure. All nitrides preserve the same structure as the parents. Introduction of nitrogen results in an increase in lattice constants a and c, and the expansion of unit-cell volume is about 6%. The Curie temperature was found to increase distinctly after nitrogenation. Nitrogen absorption leads to an increase in saturation magnetization, the values of the saturation magnetization increase monotonically with increasing Y or Gd concentration. Nitrogenation increases the uniaxial anisotropy of the Er sublattice, and causes a spin reorientation. The Y and Gd concentration dependencies of the spin reorientation temperature Tsr exhibit maxima. The tentative spin phase diagrams are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355410
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetohistory effects and spin reorientations of Nd3Fe29−xTx and Nd3Fe29−xTxN4 (T=V and Cr) compounds : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5170-5172 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The novel compounds Nd3Fe29−xTx (T=V and Cr) have been successfully synthesized. Their x-ray patterns can be indexed with a monoclinic symmetry and the A2/m space group. The Curie temperatures of Nd3Fe29−xTx are 455 and 413 K for T=V and Cr, the saturation magnetization at 4.2 K and room temperature are 54.7 and 46.8 μB/f.u. for T=V and 49.9 and 32.2 μB/f.u. for T=Cr, and the anisotropy fields at 4.2 K and room temperature are 12.8 and 2.4 T for T=V and 9.1 and 1.2 T for T=Cr, respectively. The spin reorientations of the easy magnetization direction of Nd3Fe29−xTx are observed at around 230 K for T=V and 135 K for T=Cr, respectively. After nitrogenation the relative volume expansion was about 6%, Curie temperature of each nitride increased about 50%, and the transition temperature Tsr of the spin reorientations of the nitride also increased 145 K for T=V and 250 K for T=Cr, respectively, compared with its parent compound. Nitrogenation resulted in remarkable improvements in the saturation magnetization and anisotropy fields at 4.2 K and room temperature. Magnetohistory effects for Nd3Fe29−xTx and Nd3Fe29−xTxN4 (T=V and Cr) in a low field have been observed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365160
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis and magnetic properties of novel compounds R3(Fe, T)29 (R=Y, Ce, Nd, Sm, Gd, Tb, and Dy; T=V and Cr) (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 7450-7457 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A systematic investigation of structure and intrinsic magnetic properties of the novel compounds R3(Fe, T)29 (R=Y, Ce, Nd, Sm, Gd, Tb, and Dy; T=V and Cr) has been performed. The lattice constants and unit cell volume decrease with increasing the rare-earth atomic number from R=Nd to Dy, except for Ce, reflecting the lanthanide contraction. The Curie temperature increases from R=Ce to Gd and decreases from Gd to Dy, respectively, with increasing atomic number and Gd3Fe29−xTx has the highest Curie temperature for each series of R3Fe29−xTx (T=V or Cr) compounds. The saturation magnetization of R3Fe29−xTx at 4.2 K decreases gradually from R=Nd to Dy with increasing atomic number, except for Ce, in each series of R3Fe29−xTx. It is suggested that the Ce ion in Ce3Fe29−xTx is valence fluctuated which leads to the unusual magnetic properties. The spin reorientations of the easy magnetization direction of R3Fe29−xTx are observed at around 230, 230, and 160 K for R=Nd, Sm, and Tb when T=V, and at around 230 and 180 K for R=Nd and Tb when T=Cr, respectively. First order magnetization processes are observed around 5.7 T for Sm3Fe26.7V2.3 and 4 T for Sm3Fe24.0Cr5.0 at 4.2 K, 2.0 T for Tb3Fe28.0V1.0, and 2.3 T for Tb3Fe28.0Cr1.0 at room temperature. A phenomenological analysis shows that the saturation magnetization of R3Fe29−xTx compounds with a low T concentration can be roughly calculated based on a combination of those of the 2:17R and 1:12 units in a ratio of 1:1. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365287
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  • 5
    Electronic Resource
    Electronic Resource
    Model for calculating Tc of pluralistic magnetic component compounds (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 7456-7460 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A coupling model of the pluralistic magnetic component R-T intermetallic compounds (R denotes rare earth, T denotes transition metal) has been proposed by means of the mean-molecular-field analysis. Using the model, the Curie temperature Tc of (Sm1−xPrx)2Fe17 compounds has been calculated and the calculated values have been compared with the experimental values. It is found that the former are consistent with the later. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357973
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic properties of Er2Fe17−xAlxNy compounds : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6241-6243 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Structural and magnetic properties of the Er2Fe17−xAlxNy compounds (0≤x≤3) have been investigated. All nitrides and parent compounds crystallize in the Th2Ni17 structure. Al substituted for Fe leads to an increase in lattice constants a and c. Introduction of nitrogen results in a further increase of lattice constants, but the magnitude of this increase is smaller for increasing x. As Al content increases, the Curie temperature of the parent compound increases, whereas the Curie temperature of the nitride decreases. The substitution of Al for Fe results in a decrease of Fe moment in both nitrides and parent compounds. Introduction of nitrogen leads to an increase in the uniaxial anisotropy of the Er sublattice and a spin reorientation. A tentative spin phase diagram has been constructed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355411
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  • 7
    Electronic Resource
    Electronic Resource
    Formation and magnetic properties of novel compounds Tb3(Fe1−xVx)29 (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 3248-3252 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A systematic investigation of the structure and magnetic properties of novel compounds Tb3(Fe1−xVx)29 (x=0.033, 0.044, 0.056, and 0.061) has been performed. The lattice parameters and Curie temperatures are obtained. The saturation magnetization of Tb3(Fe1−xVx)29 decreases but the anisotropy field increases linearly with increasing V concentration at 4.2 K and room temperature. The spin reorientations of the easy magnetization direction of Tb3(Fe1−xVx)29 occur at around 160 K. A first order magnetization process of Tb3(Fe1−xVx)29 is observed with magnetic field in the range between 2.0 and 1.6 T at room temperature. The saturation magnetization of Tb3Fe29−yVy with a low V concentration at 4.2 K can be roughly calculated based on a combination of that of the Tb2Fe17 and TbFe12−yVy units in a ratio of 1:1. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364157
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetic properties of R2Fe17−xGax compounds (R=Y, Ho) : 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. 6740-6742 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Structural and magnetic properties of the R2Fe17−xGax compounds (R=Y, Ho, 0≤x≤6) have been investigated. All investigated Ho2Fe17−xGax compounds with x(approximately-greater-than)2.5 crystallize in the Th2Zn17-type structure and the others in the Th2Ni17-type structure. The substitution of Ga for Fe leads to an increase in lattice constants a, c, and unit-cell volume, a decrease of the average Fe moment, and a maximum of the Curie temperature as a function of the Ga concentration at x=3, for both Y2Fe17−xGax and Ho2Fe17−xGax compounds. The high magnetic field leads to a spin phase transition from the ferromagnetic to the canted phase. The critical field Bc of the transition decreases with increasing Ga concentration. The exchange interaction constants JTT between Fe–Fe spins and JRT between R–T spins have been derived from a mean field analysis of Curie temperature. It has been found that JTT increases at first, going through a maximum at x=3, then decreases with increasing x, whereas JRT is almost independent of the Ga content, which is consistent with the result obtained from a mean field analysis of the high field magnetization curves of the Ho2Fe17−xGax.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358147
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  • 9
    Electronic Resource
    Electronic Resource
    The magnetic properties of R2(Fe1−xSix)17 compounds (R=Dy, Y) (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 7452-7455 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structures and magnetic properties of R2(Fe1−xSix)17 compounds (R=Dy, Y) were investigated by x-ray phase analysis and magnetic measurements. It is shown that Si substitution for Fe leads to a phase transition at x=0.2, and that the mean iron magnetic moment μFe of R2(Fe1−xSix)17 compounds (R=Dy, Y) decreases as Si concentration x increases; moreover, there is a maximum of dependence Tc(x) at about x=0.16. It is found that the exchange interaction constant AFeFe in R2(Fe1−xSix)17 compounds (R=Dy, Y) increases with x increasing by means of mean-molecular-field analysis of Tc. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357972
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetic properties of RFe11.3Nb0.7 compounds (R=rare earth) (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4684-4686 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Structural and magnetic properties of RFe11.3Nb0.7 compounds with rare-earth elements (R=Y, Sm, Gd, Tb, Dy, Ho, and Er) have been investigated. The Curie temperature increases for R=Sm–Gd, then decreases from R=Gd to Er. In the compound with R=Tb, with increasing temperature, a spin reorientation from an easy magnetization direction in the plane to an easy cone occurs at 365 K. In the compound with R=Er, a spin reorientation from easy plane to easy axis is found at about 40 K. Two spin reorientations take place in the compound with R=Dy, from easy plane to a complex structure at 125 K and from complex structure to easy axis at 210 K. At room temperature, the easy magnetization direction is along the c axis for R=Y, Sm, Gd, Dy, Ho, and Er, and in the plane for R=Tb. Studies of the magnetic anisotropy in YFe11.3Nb0.7 and GdFe11.3Nb0.7 point out that the Fe sublattice anisotropy is of easy axis type. In HoFe11.3Nb0.7, a first-order magnetization process takes place below 150 K when an external magnetic field is applied along the hard magnetization direction. The exchange-interaction constants JR–Fe decreases with increasing atomic number of R, as is generally found in rare-earth transition-metal compounds. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370447
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