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  • Electronic Resource  (33)
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  • Electronic Resource  (33)
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  • 1
    Electronic Resource
    Electronic Resource
    Spin-reorientation phenomenon in pseudobinary (Pr1−xRx)Co5 compounds (R=Sm, Gd, Dy, Tb, Ho, and Er) as determined by ac susceptibility measurements : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 6061-6063 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spin-reorientation transitions in (Pr1−xRx)Co5+δ, where R=Sm, Gd, Tb, Dy, Ho, and Er were determined by ac susceptibility measurements. The spin-reorientation temperature TSR of PrCo5 decreases from 105 K to lower temperatures when Pr is partially replaced by Sm, Gd, or Er. This decrease arises from different causes: the decrease of TSR in (Pr1−xGdx)Co5 results from the dilution of nonaxial anisotropy on the Pr sublattice, while the decrease of TSR in (Pr1−xSmx)Co5 and (Pr1−xErx)Co5+δ is due to the positive second-order Stevens coefficients of Sm and Er which yield uniaxial anisotropies. Rare earths of negative second-order Stevens coefficients such as R=Tb and Dy give rise to axial to conical and conical to planar transitions for x(approximately-greater-than)0.3 and 0.4 in (Pr1−xTbx)Co5+0.1x and (Pr1−xDyx)Co5+0.2x, respectively. Magnetic anisotropy phase diagrams of these systems are constructed accordingly.〈UFMMM〉
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347770
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic and crystallographic properties of NdCo4M (M=B, Al, and Ga) (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4635-4637 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic and crystallographic properties have been investigated for NdCo4M (M=B, Al, and Ga). The temperature dependencies of lattice parameters have been determined between 80 and 730 K by x-ray diffraction. NdCo4B crystallizes in the CeCo4B-type structure, whereas NdCo4M (M=Al and Ga) exhibits a CaCu5-type structure. Magnetic properties of NdCo4B show a clear difference from those of its Al and Ga counterparts. All these compounds exhibit planar anisotropy in the low-temperature regime, and the spin-reorientation temperature is found to be ∼280 K for NdCo4Al and NdCo4Ga, whereas NdCo4B is planar up to its Curie temperature. Thermal expansion curves of c axes show an anomalous contraction for NdCo4B and expansion for NdCo4Al and NdCo4Ga only in the temperature region of planar anisotropy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344837
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  • 3
    Electronic Resource
    Electronic Resource
    Crystal structure and magnetic characteristics of alloys based on R-Fe-Si (R=Y, Nd, Gd, Dy, Ho, Er) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6272-6274 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Crystal structure and magnetic properties of ternary compounds based on R2Fe14Si2 (off-stoichiometric R2Fe17 type) were investigated. Results of the powder x-ray-diffraction indicated that the compounds examined in this study crystallize in the rhombohedral Th2Zn17-type structure when R is Nd or Gd and in the hexagonal Th2Ni17-type when R is Y, Dy, Ho, or Er. The Curie temperature TC and room-temperature saturation magnetization Ms of R2Fe14Si2 system range from 465 to 572 K and 65 to 150 emu/g, respectively. The behavior of TC is found to follow the root of the de Gennes function and can therefore be ascribed to the strength of the rare-earth–iron exchange interaction. The average magnetic moment of Fe in R2Fe14Si2 is estimated to be approximately 2.0 μB at 77 K. Addition of Si in the binary R-Fe lattice induced a large uniaxial magnetic anisotropy at room temperature in some alloys. Results of M vs T for Er2Fe14Si2 indicate a spin reorientation transition at about 100 and 35 K. Dy2Fe14Si2 and Ho2Fe14Si2 exhibit a remarkable magnetic hardening at low temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352667
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetism of (Sm,R)2Fe17Ny (R=Y, Tb or mischmetal) : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6024-6026 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic properties are reported for nitrides of the formula (Sm1−xRx)2Fe17Ny, where R=Y, Tb, or mischmetal and y=2.5 to 2.8. Substantial replacement of Sm by R is observed for Sm2Fe17−60% by mischmetal and 100% by Y or Tb. In all cases nitrogenation expands the lattice and increases Tc by 300 to 400 K. Magnetization decreases as Sm is replaced by Tb but increases when Y is the dopant. The latter implies antiferromagnetic coupling in Sm2Fe17. The uniaxial anisotropy observed for Sm2Fe17Ny is weakened by replacing Sm with Tb or Y. The weakening is greater in the case of Tb; this follows since the Tb crystal field interaction opposes that of Sm, whereas Y acts essentially as a mere diluent. If dilution were the only effect, HA would fall linearly with composition. Behavior approaching this is observed. Some of the systems appear to be of interest for permanent magnet fabrication.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350081
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  • 5
    Electronic Resource
    Electronic Resource
    Critical current density and flux pinning dominated by neutron irradiation induced defects in YBa2Cu3O7−x : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6513-6515 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The functional dependence of critical current density (Jc) upon defect density is studied with neutron irradiation of YBa2Cu3O7−x. Identical polycrystalline samples of YBa2Cu3O7−x have been irradiated with fast neutrons (E(approximately-greater-than)0.1 MeV) in eight steps between 0 and 2.1 × 1018 n/cm2. Critical current densities are obtained from magnetic hysteresis measurements and correlated with defect density measurements obtained from transmission electron microscopy. We observe that despite the existence of a significant degree of hysteresis in the as grown material the hysteretic Jc in the irradiated samples appears to be dominated by a power law dependence on neutron fluence with an exponent of approximately 1/3 over a wide range of temperature, field and fluence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349891
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic properties of the Y1−xGdxCo3B2 system : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6540-6542 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic properties of Y1−xGdxCo3B2 with x=0, 0.2, 0.4, 0.6, 0.8, and 1.0 have been studied in a wide temperature range from 4.2 to 1250 K. All compounds studied here have the CeCo3B2-type structure which is a derivative of the RCo5 type one. In this system, the Co atom is nonmagnetic down to 4.2 K and the Curie temperature decreases almost linearly with increasing composition x and is expected to vanish at around x=0 (YCo3B2). For the sample with x=0.2, a spin-glass freezing point has been found in addition to the usual ferromagnetic Curie temperature. Gd magnetic moments obtained from the saturation magnetizations at T=4.2 K are generally smaller than those obtained from the Curie–Weiss constants in the high-temperature paramagnetic region, which suggests a slight polarization of the Co atoms antiparallel to the Gd moment in the ferromagnetic region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349900
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic studies of (Gd1−xMx)5Si4 alloys (M=La or Y) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5571-5573 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In 1967, Holtzberg, Gambino, and McGuire [J. Phys. Chem. Solids 28, 2283 (1967)] observed that intermetallic Gd5Si4 exhibits TC = 336 K. This is remarkable in that the TC of Gd (∼291 K) is increased by chemical union with a nontransition metal, which is rare, if not unique. In the present study, magnetization-temperature behavior of Gd5Si4 and (Gd1−xMx)5Si4 systems with M=La or Y were studied and compared with the Brillouin function (BF) to see if molecular-field theory is obeyed. Demagnetization near TC is much sharper for the alloys than expected from the BF. As examples, at T/TC = 0.9, the BF for Gd5Si4 gives M/M0 = 0.38, whereas the observed values range from 0.99 [for (Gd0.8Y0.2)5Si4] to 0.5 [for (Gd0.6La0.4)5Si4]. The factors responsible for these strong deviations from the BF and the high-TC values of these alloys are as yet unclear. X-ray patterns for yttrium-doped samples with x=0.1–0.5 and La with x=0.05 and 0.1 appear identical to the pattern for Gd5Si4, indicating no structural change. For La substitution of x=0.2 and above, there is a change from orthorhombic to tetragonal structure. All of the compounds show a decrease in Curie temperature and magnetic moment as Gd is decreased, as expected because of the replacement of Gd by a nonmagnetic species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347953
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of Al substitution on the magnetic properties of RCo5 (R=rare earth) (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4638-4640 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic and structural characteristics of RCo5−xAlx have been established for R=Y, La, Ce, Pr, Nd, Sm, Gd, Dy, Er, and Tm. All systems have the CaCu5 structure. Al and Co are randomly distributed over the Co-sublattice sites. Al-substitution decreases μCo and Tc and significantly alters magnetic anisotropy. Analysis of the magnetic anisotropy data shows that the Sm anisotropy in SmCo4Al is only 32% of that in SmCo5. In terms of the point charge model this requires that Al carry a positive charge. This is consistent with inferences drawn from the decreased Co moment accompanying Al substitution, which implies electron transfer from Al to Co. At room temperature, RCo4Al systems are uniaxial for R=Y, La, Ce, Pr, Sm, and Er, whereas for R=Nd and Dy the magnetization is at an angle with respect to the unique c axis. PrCo4Al, NdCo4Al, DyCo4Al, and TmCo4Al exhibit changes in anisotropy at about 165, 295, 420, and 84 K, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344838
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  • 9
    Electronic Resource
    Electronic Resource
    Metal-bonded Sm2Fe17-N-type magnets : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6027-6029 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A number of metal-bonded Sm2Fe17-N magnets have been fabricated. These magnets exhibit iHc = 5.1–17.0 kOe, Br = 6.4–8.4 kG, (BH)max=5.0–10.8 MGOe, Tc = 757 K, and ρ=6.2–6.7 g/cm3. Powder metallurgical techniques have been employed with a mixture of powdered Sm2Fe17-N and Zn, Sn, or In. Heat treatment is carried out in the temperature range of 160–450 °C in a N2 atmosphere at pressures ranging from 0–900 psi. The effects of Zn, Sn, and In contents and heat treatment conditions on the magnetic properties have been studied. Zn as the binder significantly enhances the coercivity iHc from 1.8–2.5 kOe for Zn-free magnets to 5–17 kOe for 9–20-wt. % Zn-containing magnets. The Fe-Zn phase, FeZn4, and/or Fe3Zn7, formed during heat treatment, may play an important role in producing a high coercivity. Sn-bonded magnets exhibit significant coercivity, whereas the In-bonded materials do not. The coercivity behavior is discussed in terms of the chemistry of the system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350082
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  • 10
    Electronic Resource
    Electronic Resource
    An analysis of the Pr contribution to the spin-reorientation phenomenon in PrCo5 : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6131-6133 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spin-reorientation phenomenon in the PrCo5 compound has been analyzed over the temperature range 0 to 300 K using a Hamiltonian consisting of the crystal-field term and the 4f–3d exchange interaction. We have performed a careful analysis by including the second- and the fourth-order interaction terms to the crystal-field Hamiltonian. In general, the crystal-field B02 term favors the planar anisotropy while B04 term promotes an axial anisotropy. The combination of these two terms yield the off-axial anisotropy of the Pr sublattice. The magnitudes of B02 and B04 contribution are relatively strong at low temperatures and decrease considerably with increasing temperature. The contribution of the B02 term is more pronounced than that of the B04 term throughout the temperature range investigated. The competition between the off-axial anisotropy of Pr sublattice and the axial anisotropy of Co sublattice yields the spin-reorientation transition phenomenon in PrCo5 at 105 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350019
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