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  • Electronic Resource  (7)
  • 1990-1994  (7)
  • 1985-1989
  • 1990  (7)
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  • Electronic Resource  (7)
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  • 1990-1994  (7)
  • 1985-1989
Year
  • 1
    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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    Paper (German National Licenses)
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  • 2
    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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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of crystal alignment on the remanence of sintered NdFeB magnets (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4610-4612 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nd15.4Fe77.8B6.8 magnets of various degrees of crystal alignment have been prepared by the conventional powder metallurgy technique. The alignment of these magnets have been determined by x-ray diffraction and fitting the standard deviation of a Gaussian distribution for the relative intensity versus the angle between the normals of (hkl) and the tetragonal c axis. The standard deviation is a good indicator for crystal alignment. An aligning field of 8 kOe is found to be essential to obtain a well-aligned NdFeB magnet. The remanence of sintered magnets is directly affected by the crystal alignment. Furthermore, the effect of crystal alignment on the remanence follows the theoretical prediction of the Stoner–Wohlfarth model. Below the spin reorientation temperature, the effect of crystal alignment on the shape of hysteresis loop becomes more significant. The remanences extrapolated from first and second quadrant of the hysteresis loops have been found to be consistent with the prediction of Stoner–Wohlfarth model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344828
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  • 4
    Electronic Resource
    Electronic Resource
    Temperature-compensated Pr1−x−ySmxRyCo5−δ permanent magnets (R=Er, Dy, Ho, Gd, and Tb; x=0.24; y=0.2, 0.3, and 0.4) (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4662-4664 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Application of permanent magnets in devices such as traveling wave tubes requires a high degree of flux stability over a wide temperature range (−50 to 150 °C). PrCo5-based permanent magnets with near zero temperature coefficient of remanence (α) can be fabricated by the substitution of a suitable heavy rare-earth element for Pr in Pr1−x−ySmxRyCo5 (R=Er, Dy, Ho, Gd, or Tb). Pr0.76−ySm0.24RyCo5 magnets with y=0.2, 0.3, and 0.4 and R=Er, Dy, Ho, Gd, and Tb were fabricated and the temperature coefficient of remanence (α) and the temperature coefficient of coercivity (β) were determined. Among all the heavy rare-earth elements examined, the substitution of Er resulted in magnets with maximum Br and (BH)max at all temperatures (22–150 °C). Magnets with the substitution of Gd exhibited the highest Hci at all temperatures. The substitution of Dy and Tb gave magnets with low values for Br and (BH)max. Optimally processed magnets with a typical composition Pr0.46Sm0.24Er0.3Co4.6 exhibited Br =8000 G, Hci =15 800 Oe, (BH)max =16 MG Oe at room temperature, and α=−0.015 (%/ °C) and β=−0.34 (%/ °C) over the temperature range 22–150 °C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344846
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic and structural characteristics of the Nd2(Co,Fe)7B3 system (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4981-4983 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nd2Co7−xFexB3 alloys have been synthesized and studied at temperatures from 4 to 1100 K at fields up to 90 kOe. The structure and magnetic properties vary significantly with changing Fe content. The main phase is observed to be of hexagonal symmetry for x〈3. For x〉4 it is multiphase, the major phase having tetragonal symmetry. The Tc increases from 330 to 885 K when x varies from 0 to 3, then decreases from 885 to 577 K when x increases from 3 to 7. The saturation magnetization is 8μB/fu at 4.2 K, for Nd2Co7B3; it increases with increasing Fe content. The alloys exhibit a conical (0〈x〈3) and an axial (x〉4) magnetocrystalline anisotropy at 295 K. They all exhibit conical magnetic anisotropy at 77 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344696
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  • 6
    Electronic Resource
    Electronic Resource
    Spin reorientation phenomenon in Nd0.5Er1.5Fe14−xMxB (M=Al and Co), as determined by ac susceptibility measurements (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4589-4591 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spin reorientation transitions (SRTs) in Nd0.5Er1.5Fe14−xMxB, where M=Al or Co and x=0–3, were determined by ac susceptibility measurements. In Nd0.5Er1.5Fe14B, the SRT is observed at about 195 K. The addition of Al was found to shift the SRT to lower temperatures, presumably due to the weakening of the rare earth–transition metal exchange interaction. For M being Al and x=2, an additional SRT is observed at about 25 K, possibly due to a change of cone angle. Similar reductions in the SRT temperature were observed with Co substitution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344848
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  • 7
    Electronic Resource
    Electronic Resource
    Observation of proposed flux pinning sites in neutron-irradiated YBa2Cu3O7−x (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 2150-2152 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Microstructure and magnetic hysteresis have been compared for two samples of the YBa2Cu3O7−δ (δ∼0) high-temperature superconductor, one unirradiated, and one irradiated with fast neutrons (E(approximately-greater-than)0.1 MeV) to a fluence of 3×1018 n/cm2. Notable changes in the microstructure include strain-induced contrast from regions 2–7 nm in size. An intrinsic critical current density (Jc) of 4.6×106 A/cm2 in zero field at 4 K has been determined from magnetic hysteresis measurements for the irradiated sample while 1.2×106 A/cm2 is noted for the unirradiated sample. We propose that the observed defect structure in the irradiated material is responsible for increased pinning and consequently higher Jc's.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104159
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