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  • 1
    Electronic Resource
    Electronic Resource
    A high field Faraday magnetometer for measurements under high pressure (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5638-5638 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Commercially supplied SQUID magnetometers which provide the best sensitivity (10−8 emu) are becoming more popular for routine magnetic property measurements. However, these magnetometers generally provide a very small usable sample space (9 mm) and a maximum field limited to 5.5 T. The sensitivity of SQUID magnetometers drops with increasing magnetic fields strengths and becomes comparable to or lesser than the sensitivity of Faraday magnetometers at a field of 5.5 T (5×10−5 emu). Therefore, Faraday magnetometers are a better choice, if a high sensitivity in high magnetic fields is required and/or a large sample space is needed, for example, to accommodate a pressure clamp for high pressure measurements. We have constructed a Faraday magnetometer which facilitates the measurements under high pressure conditions (up to 20 kbars in Cu–Be clamps) and in fields up to 13 T in a 24 mm warm bore (1.3–300 K) and 45 mm cold bore. To accommodate the weight of the pressure clamp, the magnetometer is equipped with a microbalance of extended weighing capacity (100 g) with a sensitivity of 10−6 g. Its superconducting magnet was specially designed to have a gradient such that the product H dH/dz remains nearly constant over a cylindrical sample volume of 20 mm×50 mm, which is the typical size of our pressure clamps. The details of pressure clamps will also be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353622
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  • 2
    Electronic Resource
    Electronic Resource
    Variable texture NiOFe2O3 ferrite films prepared by pulsed laser deposition : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5425-5427 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pulsed laser deposition using bulk NiOFe2O3 targets onto heated substrates has been used to synthesize single phase Ni spinel ferrite films onto various substrates. Flowing oxygen has been used during the deposition to maintain the oxygen stoichiometry. Ni ferrite films have been deposited onto C-, R-, and A-plane sapphire, polycrystalline Al2O3, and fused silica. Single-crystal (111) oriented NiOFe2O3 films have been made onto C-plane sapphire for substrate temperatures of greater than 900 °C. Polycrystalline highly (400) textured Ni ferrite films have been made onto R-plane sapphire with I(400)/I(311)=6.15. Films made onto A-plane sapphire, polycrystalline alumina, and fused silica showed only moderate texturing. The coercive force of the (111) oriented NiOFe2O3 was 120 Oe perpendicular to the film plane and 95 Oe in plane. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362327
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic anisotropy in the Nd(Fe,Co)10Mo2 system : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6248-6250 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The NdFe10−xCoxMO2 alloy system (x=0,1,3,5,7,10) has been synthesized and studied by x-ray and magnetometry techniques. All of the compounds in this series crystallize in the tetragonal ThMn12-type structure. X-ray-diffraction analyses on aligned powders indicate that the anisotropy in this system is strongly modified by Co substitution. A distinctive feature we observe is that, with increasing Co content, the easy direction of magnetization at 300 K appears to deviate from the c axis for x≤3, and becomes axial for x≥5. The spin reorientations are observed for x=0,1,3. For x≥5, the room-temperature anisotropy field increases with the increase of Co content, i.e., from 18 kOe at x=5 to 34 kOe at x=10, and no spin reorientations are observed. The first-order magnetization process is observed for x≥5. The Curie temperature is considerably enhanced by Co substitution in this system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352660
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  • 4
    Electronic Resource
    Electronic Resource
    Temperature and field-induced spin reorientations in NdFe10−xCoxMo2 single crystals : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6327-6329 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single crystals of the NdFe10−xCoxMo2 alloy system (x=0,1,3,5,7,10) have been prepared by the Czochralski technique and studied by x-ray and magnetometry techniques. All of the compounds in this series crystallize in the tetragonal ThMn12-type structure. The single-crystal data support the previous findings on polycrystalline samples, namely, that (1) with increasing Co content, the easy direction of magnetization at 300 K appears to deviate from the c axis for x≤3, and becomes axial for x≥5; (2) temperature-induced spin reorientations are observed for x〈3; and (3) for x≥5, no temperature-induced but field-induced spin reorientations are observed. Single-crystal data also clarify the anomalies observed in the temperature-dependent magnetization data on polycrystalline samples. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361988
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic properties and molecular field theory analysis of RFe10Mo2 alloys : 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. 6754-6756 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The RFe10Mo2 compounds (R=Y, Nd, Gd, Dy) with ThMn12 type structure have been synthesized, and their magnetizations have been investigated in the temperature range from 2 to 800 K using a SQUID magnetometer. The Curie temperature, saturation moments, and measurements, as well as molecular field analysis of the temperature dependence of the magnetization are reported. Our work demonstrates that the molecular field analysis based on a two-sublattice model is capable of quite accurately describing the temperature dependence of the magnetization for the RFe10Mo2 compounds. The results also suggest that the moments of the R and Fe sublattices are nearly collinear in a large temperature range. According to the calculated molecular field coefficients, we find that the magnetic interactions are dominated by exchange between iron 3d electrons, and, on the other hand, the strength of the R–R interaction has even the same order as that of the R–Fe interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358152
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic anisotropies in RFe10−xCoxMo2 compounds (R=Dy, Er) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6229-6231 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of Co substitution on magnetic anisotropy and spin reorientation phenomena have been investigated in the DyFe10−xCoxMo2 and ErFe10−xCoxMo2 (x=0 to 10) series in the temperature range from 4.2 to 300 K. X-ray diffraction patterns on aligned samples indicated that the easy direction of magnetization (EDM) of the DyFe10−xCoxMo2 series is along the c axis at room temperature for all values of x. The spin reorientations were observed for all samples in the DyFe10−xCoxMo2 series except for x=10, and the spin reorientation temperature, Tsr, decreases with the increase of Co content x. The magnetic phase diagram of DyFe10−xCoxMo2 has been constructed. These results, together with the results from the YFe10−xCoxMo2 series, may lead to the conclusion that the anisotropy of Dy sublattice changes from planar to axial in the DyFe10−xCoxMo2 series with the increase of Co content. The EDM in the ErFe10−xCoxMo2 series was found to be nonaxial for 2≤x≤6 for all temperatures below Tc. For x〈2 and x(approximately-greater-than)6 the ErFe10−xCoxMo2 compounds exhibit an axial EDM at room temperature, and spin reorientations occur at about 210 K for x=8 and at 140 K for x=10. Since Er and Dy have opposite sign of second-order Stevens factor, the above results of two systems are consistent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355407
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  • 7
    Electronic Resource
    Electronic Resource
    Structural and magnetic properties of rare-earth iron nitride Ce2(Fe1−xCox)17Ny series : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5896-5898 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ternary nitrides Ce2(Fe1−xCox)17Ny have been studied to determine the effect of nitrogenation on their crystal structure and magnetic properties. X-ray diffraction results show that the nitrides retain the rhombohedral Th2Zn17 structure of their parent compounds, but with an expansion in the unit cell volume. For x≥0.6, no Th2Zn17-type nitride compounds are formed. The room temperature saturation magnetization of nitrides is greater than that of the parent compounds for low Co concentrations. The 3d sublattice anisotropy is modified upon nitrogenation; the transition from easy plane to easy axis shifts from x≈0.5 in Ce2(Fe1−xCox)17 to x≈0.15 in Ce2(Fe1−xCox)17Ny.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353514
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  • 8
    Electronic Resource
    Electronic Resource
    Structural magnetic and electrical transport properties of (Nd,Sm)0.5Sr0.5MnO3 compounds (abstract) : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4957-4957 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In recent years rare-earth manganese oxide compounds have been the object of numerous studies because of their large magnetoresistance. The (Nd,Sm)0.5Sr0.5MnO3 compounds have been reported to exhibit magnetic-field-induced first-order phase transitions as well as striction coupled magnetoresistance properties.12 We have prepared samples across the (Nd1−xSmx)0.5Sr0.5MnO3 series with x=0, 0.25, 0.50, 0.75, and 1.0 to study the physical properties of this system. The x-ray diffraction studies revealed that all samples have almost identical patterns with a few very weak additional reflections on the Nd-rich end that are due to the presence of (〈5%) of the SrMnO3 phase. The observed x-ray diffraction patterns matched with the La0.8Sr0.2MnO3-type monoclinic structure (S.G. P2/c) with lattice parameters a=5.429 Å, b=5.450 Å, c=7.652 Å, and B=90.2°. The slight distortion of angle B from 90° suggests that the x-ray data may also be indexed by a closely related GdFeO3-type (S.G. Pbnm) orthorhombic structure reported for a single-crystal sample in Ref. 1. However, our observed intensity pattern matched better with the former structure. A ferromagnetic state was observed below 250 K for x=0 and the magnetic ordering temperature shifted to lower temperatures with increasing x: the x=1 sample showed magnetic ordering at temperatures below 150 K, in agreement with the published results.2 The samples exhibited a marked field dependence below the ferromagnetic ordering temperature but preliminary data on polycrystalline samples did not show a first-order transition from a metallic ferromagnetic to nonmetallic antiferromagnetic state that has been reported for a single-crystal sample with x=0 (Ref. 1). © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365010
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  • 9
    Electronic Resource
    Electronic Resource
    Prenatal paracetamol exposure and risk of asthma and elevated immunoglobulin E in childhood (2005)
    Oxford, UK : Blackwell Science Ltd
    Clinical & experimental allergy 35 (2005), S. 0 
    Details
    ISSN: 1365-2222
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background We recently found that paracetamol (acetaminophen) use in late pregnancy was associated with an increased risk of early wheezing in the offspring.Objective To see whether use of paracetamol in late pregnancy is associated with an increased risk of asthma, wheezing and other atopic outcomes in the child at school age.Methods In the population-based Avon Longitudinal Study of Parents and Children, we measured associations of paracetamol and aspirin use in late pregnancy (20–32 weeks) with asthma, hayfever, eczema (n=8511) and wheezing (8381) in the offspring at 69–81 months, and with atopy (positive skin prick test to Dermatophagoides pteronyssinus, cat or grass, n=6527) and blood total IgE (n=5148) at 7 years. We used logistic and linear regression to analyse binary outcomes and log-transformed IgE, respectively, controlling for potential confounders.Results Use of paracetamol, but not aspirin, in late pregnancy was positively associated with asthma (odds ratios (ORs), comparing children whose mothers took paracetamol ‘sometimes’ and ‘most days/daily’ with those whose mothers never took it, 1.22 (95% confidence interval (CI): 1.06–1.41) and 1.62 (95% CI: 0.86–3.04), respectively; P trend=0.0037), wheezing (ORs 1.20 (95% CI: 1.02–1.40) and 1.86 (95% CI: 0.98–3.55), respectively; P trend=0.011), and total IgE (geometric mean ratios 1.14 (95% CI: 1.03–1.26) and 1.52 (95% CI: 0.98–2.38), respectively; P trend=0.0034), but not hayfever, eczema or skin test positivity. The proportion of asthma attributable to paracetamol use in late pregnancy, assuming a causal relation, was 7%.Conclusion: Paracetamol exposure in late gestation may cause asthma, wheezing and elevated IgE in children of school age.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2222.2005.02151.x
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetic properties of Y(Fe,Co)10Mo2 alloys : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6021-6023 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structural and magnetic properties of YFe10−xCoxMo2 alloys (0≤x≤10) have been investigated by means of x-ray diffraction, thermomagnetic analysis, and magnetometry techniques. All the alloys exhibited the tetragonal ThMn12 structure and were almost single phase materials. With the increase of Co content x, Tc increases initially, reaching a maximum at x∼6, followed by a decrease at higher x values. X-ray diffraction analyses on magnetically aligned samples indicate that YFe10Mo2 exhibits an axial easy direction of magnetization (EDM) at room temperature, and the addition of Co initially causes the EDM to deviate gradually from the c axis with increasing x (x≤4). On further increase of Co content (x≥5), the EDM of the YFe10−xCoxMo2 compounds tends to become axial again, reaching a complete uniaxial behavior for the terminal compound YCo10Mo2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355495
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