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  • 1
    Electronic Resource
    Electronic Resource
    Effect of NdF3 and NdCl3 substitution for Nd2O3 on the reduction–diffusion process of Nd–Fe–B powders : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6612-6614 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of partial substitution NdX3 (X=F or Cl) for Nd2O3 on the reduction–diffusion (R/D) process of Nd–Fe–B powders has been investigated. NdX3 reacts with Ca in the R/D process to produce CaX2. CaCl2 is distributed uniformly around the Nd2Fe14B grains after reaction. During water washing, CaCl2 reacts quickly with water. This improves the disintegration of compacts and facilitates the removal of Ca. The best results with residual Ca content of 400 ppm and oxygen content of 3000 ppm were obtained. In the case of fluoride, however, a negative result was found. There was no improvement in the disintegration of fluoride compact. This was due to the poor water affinity of CaF2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349874
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  • 2
    Electronic Resource
    Electronic Resource
    Hydrogen induced radial anisotropic R-Fe-B magnet (R=Pr,Dy) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5518-5520 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of alloying concentration of Dy and the absorption amount of hydrogen on the magnetic properties of PrFeB magnets have been studied in this work. Experimental data show that the easy direction of magnetization (EDM) of the Pr-Fe-B-H system is determined by hydrogen concentration. Radial anisotropic magnets can be obtained from hydrogenated Pr15Fe79B6 powders with hydrogen of 4500 ppm. A slight decrease of hydrogen content down to 4250 ppm leads to a uniaxial anisotropic magnet. Partial replacement of Pr by Dy significantly influences the anisotropy of the Pr-Fe-B-H system with saturated hydrogen. A 0.9 at. % Dy substitution for Pr changes the anisotropy of hydrogen decrepitated powders from planer to cone, thus resulting in an isotropic magnet. As the amount of Dy substitution increases to 1.35 at. %, the EDM of magnets persist in the field direction during alignment compaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347986
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  • 3
    Electronic Resource
    Electronic Resource
    Finite-cell-gap corrections to the capacitance analysis of liquid crystal displays with periodic interdigital electrodes (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5-9 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Corrections to the capacitance analysis of liquid crystal displays with periodic interdigital electrodes are presented, accounting for the finite thickness of the liquid crystal (LC) cell gap. Conformal mapping calculations of the corrected equivalent dielectric constant for the LC material and glass substrate are carried out in terms of the aperture ratio, cell gap and LC effective dielectric constant. Departure from the infinite-cell-gap approximation occurs as the gap thickness approaches the electrode width, or the aperture ratio approaches unity. The capacitance–voltage characteristic curve obtained from the conformal mapping calculations is very close to that obtained from the two-dimensional simulations with less than 5% deviation. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371818
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  • 4
    Electronic Resource
    Electronic Resource
    Giant magnetoresistance enhancement in spin valves with nano-oxide layers (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 6928-6930 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetoresistance (MR) ratio is enhanced by 35% by inserting the nano-oxide layer (NOL) at the Ta/Co interface in the FeMn-based top spin valves (Ta/NOL/Co/Cu/Co/FeMn/Ta). The enhancement is attributed to specular reflection, resulting in a large resistance change and small sheet resistance. However, the formation of NOL at the interface of Ta/Co suppresses the (111) texture, resulting in small exchange fields. Top spin valves with NOLs show good thermal stability up to 200 °C annealing. The MR ratio is further increased after annealing at temperatures below 200 °C. Enhancement of the MR ratio by 61% can be achieved by annealing at 150 °C. For bottom spin valves (Ta/NiFe/FeMn/Co/Cu/NiFe/Ta), NOLs formed at FeMn/Co and NiFe/Ta interfaces increase MR ratios, but NOLs at Co/Cu or Cu/NiFe deteriorate the differential spin scattering and significantly reduce MR ratios. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1356717
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of nitrogen interstitial in α-Fe crystalline on the magnetic soft properties of FeTaN thin films : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5159-5161 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of nitrogen interstitial in α-Fe crystalline on the magnetic soft properties of Fe87.5Ta12.5Nx films has been investigated. The magnetic soft properties can be improved by carefully controlling the nitrogen flow ratio during sputtering and the postannealing to result in a film with fine grain size and low magnetostriction. Using x-ray diffraction technique, the nitrogen content in the α-Fe crystalline of FeTaN film can be estimated from the effect of lattice expansion of α-Fe crystalline due to nitrogen interstitial. It is found that the film with about 7.5 at. % N2 in α-Fe crystalline exhibits the best magnetic soft properties of Br=1.6 T, Hc=0.2 Oe and μi(1 MHz)=3400, respectively. X-ray diffraction analysis is found to provide a proper and an easy way to identify the suitable condition for growing excellent magnetic soft FeTaN thin films. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361540
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of Er2O3 addition on microstructure and physical properties of Mn–Zn ferrites for high-power use : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6112-6114 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The present authors found that Mn–Zn ferrites containing Er2O3 had improved values of σs (specific magnetization) and amplitude permeability. Samples with different addition amount of Er2O3 were sintered at 1180 °C. The results show that Er2O3 addition from 0.02 to 0.1 wt % causes the amplitude permeability to increase from 1070 to 2180. The magnetization can be increased from 91.6 to 92.8 emu/g within the range 0.02–0.1 wt %. Furthermore, the effect of Er2O3 addition was investigated in detail by power-loss analysis and scanning electron microscopy examination of microstructure. We found that samples with Er2O3 less than 0.04 wt % exhibit power loss similar to the sample without Er2O3 addition and with SiO2–CaO contents. Thus we conclude that the amplitude permeability and specific magnetization of Mn–Zn ferrites for high-frequency and high-power use were improved by a small Er2O3 addition (〈0.04 wt %).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355477
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  • 7
    Electronic Resource
    Electronic Resource
    Temperature dependence of switching field distribution : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5897-5899 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The peak value of switching field distribution χmax, coercivity Hc, and saturation magnetization Ms are measured as functions of temperature T in Co-γ-Fe2O3 and γ-Fe2O3 powders. It is found that χmax has a maximum at T=Tp and evidence is presented also for the existence of a theoretically predicted minimum at T=Tm〈Tp. Coercivity is decreasing with T. For Ba-ferrite platelets we find that Hc has a maximum at T=T˜p and a minimum at T=T˜m≈Tp, where χmax has a local maximum. The possible origin of this unusual behavior is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355553
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  • 8
    Electronic Resource
    Electronic Resource
    High-power-use Mn–Zn ferrites with monodomain structure prepared by low-temperature sintering : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5432-5434 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Densely sintered Mn–Zn ferrites with grain size varying between 1 and 6 μm were obtained. Then the effect of grain size was investigated in detail by power loss analysis and scanning electron microscopy examination of microstructure. It is found that the power loss is seen to be lowered from 260 to 120 kW/m3 at 500 kHz, 50 m T and 90 °C with grain size decreased in the order of 3 μm. It is assumed that the residual loss from domain wall resonance is a dominant factor of power loss from 500 kHz to 1 MHz. Therefore we conclude that Mn–Zn ferrite display a grain size dependent power loss with transition at grain size about 3 μm due to the absence of intragranular domain wall and these fine core materials can be prepared by low sintering temperature and the optimum control of atmosphere containing 0.5% O2. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362329
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  • 9
    Electronic Resource
    Electronic Resource
    Thermodynamic measurements by frontal chromatography. Practical experimental approach (1971)
    s.l. : American Chemical Society
    Analytical chemistry 43 (1971), S. 1738-1744 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60307a011
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  • 10
    Electronic Resource
    Electronic Resource
    Capacitance–voltage characteristics of liquid crystal displays with periodic interdigital electrodes (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 147-149 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Capacitance–voltage properties of the liquid crystal displays (LCD) with periodic interdigital electrodes (PIE) are characterized. The extreme capacitances at high and low driving voltages are derived analytically, based on the technique of conformal mapping. Its validity is verified by carrying out the two-dimensional simulations numerically. The results of theoretical modeling agree reasonably well with the capacitance measurement of an LCD with PIEs. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123134
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