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  • 11
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 185-189 (1991), S. 2281-2282 
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 183 (1991), S. 67-72 
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
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  • 13
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 3362-3368 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An atomic force microscope with a high-resolution three-axis laser interferometer for real-time correction of distorted topographic images has been constructed and investigated. With this apparatus, standard samples for a scanning probe microscope can be directly calibrated on the basis of stabilized wavelength of He–Ne lasers. The scanner includes a three-sided mirror block as a mobile target mirror for the interferometer, which realizes a rectangular coordinate system. The position coordinates of the sample is independently and simultaneously acquired with high-resolution (0.04 nm) X/Y/Z interferometer units and fed back for XY servo scanning and height image construction. The probe is placed on the sample surface at the intersection of the three optical axes of the interferometer with good reproducibility, so that the Abbe error caused by the rotation of the scanner is minimized. Image distortion in the XY plane and vertical overshoot/undershoot due to nonlinear motion of piezo devices, hysteresis, and creep are eliminated. The optical properties of the interferometers, mechanical characteristics of the scanner, and system performances in dimensional measurements for calibration standards are demonstrated. © 1999 American Institute of Physics.
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  • 14
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4884-4886 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The recording characteristics of Co-γFe2O3 perpendicular magnetic recording hard disk media were investigated. Sliding contact recording was performed to evaluate the intrinsic high-density recording performance of the media with using a metal-in-gap-type ring head. The half-voltage density D50 of 176 kFRPI and low-density reproduced voltage Ep of 143 nVp-p/[turn μm (m/s)] were obtained for the optimal medium whose Co-γFe2O3 layer thickness was 0.13 μm and perpendicular coercivity was 1800 Oe. The pass wear durability test was performed at 2 m/s, or at a disk rotation of 830 rpm. The reproduced voltage did not decrease with time, and scratches and damage were not observed on the tested track even after 18 000 000 passes. The Co-γFe2O3 medium is one of the candidates for ultrahigh-density recording media because of its specific advantages; superior high density recording performance and hardness tolerable for sliding contact use. © 1996 American Institute of Physics.
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  • 15
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4887-4889 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The NiO underlayer, which had 〈100〉 orientation, with NaCl-like structure could be prepared onto the glass substrate by reactive rf sputtering at ambient temperature. The CoO/Fe3O4 multilayers were grown epitaxially on the underlayer at 200 °C; the Fe3O4 and CoO on the NiO grew along the 〈100〉 axis independent of the bilayer thickness Λ, though those on the glass substrate did not show the 〈100〉 orientation for Λ(approximately-greater-than)100 A(ring). Followed by annealing of the multilayers in air at 280–350 °C, the 〈100〉-oriented Co-γ-Fe2O3 perpendicular magnetic films were obtained. The (400) of the Co-γ-Fe2O3 on the (200) of the NiO has tensile stress at the interface because of the smaller (400) spacing than the (200) spacing normal to the film plane. Therefore, the (400) spacing measured parallel to the film plane (2.072 A(ring)) was smaller than that of bulk, 2.086 A(ring). The magnetic properties of the Co-γ-Fe2O3 films on the NiO, Co-γ-Fe2O3/NiO, obtained above were evaluated. The squareness compensated by a demagnetization coefficient of Co-γ-Fe2O3/NiO were more than 0.94, though those of the Co-γ-Fe2O3 on the glass substrate, Co-γ-Fe2O3/glass, were about 0.85. The anisotropy energy of Co-γ-Fe2O3/NiO was estimated 3.3×106 ergs/cm3, which value was larger than that of Co-γ-Fe2O3/glass (2.5×106 ergs/cm3). Coercivity of the perpendicular hysteresis loop of Co-γ-Fe2O3/NiO increased with Co contents and could be controlled in the region of 0.8–5.0 kOe, although Hc of Co-γ-Fe2O3/glass were 5.0 kOe constantly. The columnar grains of the Co-γ-Fe2O3, whose diameter is 300–500 A(ring), grew continuously along the columnar grains of NiO. © 1996 American Institute of Physics.
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  • 16
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5214-5216 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Previously, we have proposed a method of solution for the inverse problems, and successfully applied it to the biomagnetic fields. In the present article, we apply our inverse approach to the leakage magnetic field source searching for the notebook computers. As a result, it is found that our inverse approach is quite effective in searching for the leakage magnetic field source. The validity of our solutions is carefully examined by comparing the measured and calculated magnetic field distributions. © 1996 American Institute of Physics.
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  • 17
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5907-5909 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Among the various nondestructive testing methods, the electric potential method requires relatively simple device and measurement. However, because of the high electrical contact resistance, sometimes it is difficult to measure the correct local electric potentials by direct contact. In order to overcome this difficulty, method is proposed which involves substituting the local magnetic field for electric potential measurements. The comparison with the conventional electric potential method demonstrates the usefulness this method, especially for materials with low resistivity.
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  • 18
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4699-4701 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recently, the wavelet analysis is being applied to the various fields, such as image data compression in informatics and spectrum analysis of the electrocardiogram. In the present article, we propose the two approaches, employing the wavelet analysis for the human heart diagnosis. One is the data base approach, and the other is an inverse approach searching for the magnetic field source of the human heart. The data base approach is an application of the data compression to the magnetocardiogram. Also, the magnetic field source searching is an application of the spectrum analysis to the magnetocardiogram. The results reveal that the data base approach makes it possible to identify the normal or abnormal heart, and the magnetic field source search is capable of estimating the current distribution of a distinct heart. © 1996 American Institute of Physics.
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  • 19
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 5287-5292 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic measurements have been performed on silver clad Tl-1223 and Tl-2223 tapes and a Tl-1223 single crystal to study the critical current properties of these samples. The Tl-1223 tape is shown by both magnetic and transport experiments to exhibit a highly granular nature, much more severe than that seen in the Tl-2223 tape, and in Bi-2223 tapes fabricated by similar rolling and pressing techniques. This characteristic is explained in terms of the poor grain alignment in the Tl-1223 tape resulting from the spherical morphology of Tl-1223 powders, in contrast with the micaceous and easily aligned Bi-2223 and Bi-2212 materials. However, evidence of a small number of strong intergrain links which remain superconducting at 77 K and 8 T is clear. The Tl-1223 single crystal exhibits clear anisotropic behavior, and this, together with the lack of good crystallographic alignment in the tapes is used to explain the variations in irreversibility line behavior between sample forms. The ratio of the irreversibility fields measured with field parallel and perpendicular to the ab plane is approximately 8. A clear "fish tail'' feature is also observed in magnetic hysteresis curves obtained from the Tl-1223 single crystal. © 1995 American Institute of Physics.
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  • 20
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 9 (1999), S. 276-282 
    ISSN: 1089-7682
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We prepared a rod-like amphiphile with a molecular recognition end group, α-helical and hydrophobic poly(γ-methyl L-glutamate) (PMG) containing hydrophilic β-cyclodextrin (CyD) as an active end group (PMG-CyD), and formed its monolayer at the n-hexane/water interface. The interfacial pressure (π)-area (A) isotherms of the monolayer showed that α-helix rod of PMG-CyD could be vertically oriented at the oil/water interface, facing the hydrophilic terminal CyD group to the water phase, by increasing the interfacial concentration of the polypeptide. Under the condition 2-p-toludinyl-naphthalene-6-sulfonate (TNS), an intimate guest molecule for the CyD in water was introduced into the water phase beneath the monolayer. Within a minute the monolayer began to oscillate which could be monitored by the rhythmic response of the interfacial pressure of the monolayer. The oscillation continued over ten minutes and then terminated. The mode of the oscillation was found to change with time, i.e., the initial stage showing a periodic sharp reduction in the interfacial pressure (period I), the second stage having sharp increase in the π value (period II), and the last stage of irregular oscillations (period III). The Fourier analysis of each period also supported the three stages during the oscillatory process. It was also found that when the α-helix rod of PMG-CyD lay down in the monolayer, the guest TNS did not induce any changes in the interfacial tension. This nonlinear rhythmic interfacial phenomenon was explained in terms of the periodic movement of the PMG-CyD monolayer resulting from the binding and releasing of the guest TNS across the oil/water interface. © 1999 American Institute of Physics.
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