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  • 1
    Electronic Resource
    Electronic Resource
    Nuclear magnetic resonance study of Co-CoO films for perpendicular magnetic recording (abstract) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5184-5184 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Co-CoO films, which are evaporated in the atmosphere of a small amount of O2, have large perpendicular magnetic anisotropy and show excellent read-write (R-W) characteristics. With heat treatment, the microstructure of a film changed and the R-W characteristics were further improved.1,2 This result indicates that the microstructure of a film changed and the R-W characteristics were further improved.1,2 This result indicates that the microstructure of a film closely relates with the R-W characteristics as it does so for Co-Cr films. We measured the spin-echo spectra of a film having various magnetizations to investigate the relationships between R-W characteristics and film microstructure, because NMR is very sensitive to the slight changes of film microstructure.1 A strong absorption was observed at 223 MHz which is for α-Co. The intensity decreased drastically as the amount of oxygen in the films increased and very broad satellites appeared around 250 MHz, implying that Co atoms having a larger magnetic moment than that of α-Co exist for the films containing oxygen atoms. Further, heat treatment increased the absorption intensity at 223 MHz, which means that the internal stress or the lattice defects were removed. The R-W characteristics were found to relate with the absorption intensity. This result shows that the crystallinity of a film greatly influences the R-W characteristics of Co-CoO films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348121
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  • 2
    Electronic Resource
    Electronic Resource
    Modeling the dc superconducting quantum interference device coupled to the multiturn input coil (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 7295-7300 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In order to study the effect of a multiturn input coil on superconducting quantum interference device (SQUID) characteristics, the radio frequency (rf) properties of the coupling circuit between the SQUID coil and the input coil are studied. For the measurement of rf properties of the coupling circuit, the so-called expanded model of the coupling circuit using normal metals was adopted, which is shown to be very useful for this purpose. It is shown that the SQUID coil cannot be expressed by a simple inductance when the SQUID coil is coupled to the input coil, i.e., many resonant structures are observed in rf properties of the coupling circuit. It is also shown that the damping resistance is useful in suppressing the resonant structures. Using the experimental results, a circuit model of the SQUID coupled to the multiturn input coil is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347576
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  • 3
    Electronic Resource
    Electronic Resource
    Electron transport properties and collision cross sections in C2F4 (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 2637-2647 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have measured the electron drift velocity, longitudinal diffusion coefficient, and ionization coefficient in tetrafluoroethene (C2F4). Using these data and the results of ab initio calculations of the elastic, momentum-transfer, and neutral-excitation cross sections, along with measurements of the partial ionization cross sections, we have performed a swarm analysis in order to construct a self-consistent set of electron impact cross sections for C2F4. The swarm analysis consists of solutions to Boltzmann's equation for electrons in C2F4 for values of E/N≤500 Td and direct Monte Carlo simulation of electron transport in C2F4 for 500 Td≤E/N≤2000 Td. We present an analysis and discussion of the sensitivity of cross sections derived from swarm data to uncertainties in the electron transport measurements. We also discuss the failure of the two-term spherical harmonic solution to Boltzmann's equation for E/N〉500 Td, which necessitated the use of Monte Carlo simulations for high values of E/N. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1433189
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  • 4
    Electronic Resource
    Electronic Resource
    Operational characteristics of the impregnated-electrode-type liquid-metal ion source with multiple tip and reservoirs : Proceedings of 5th international conference on ion sources (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 1351-1353 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new type of impregnated-electrode-type liquid-metal ion source, which eliminated the heating problem in the previous source, has been developed with multiple tip and reservoirs (TAR's). In the present ion source, the TAR's are connected electrically in series by modifying the TAR holding system. In order to achieve uniform heating of the TAR's, the materials of the knife-edged electrodes, which introduce the heating current to the TAR's, were examined. Tantalum electrodes exhibited better results as compared with the conventional Mo electrodes. Both of the two TAR's could be heated up to 700 °C with a heating power of 200 W. The maximum indium ion current of 9.1 mA was obtained from the four-TAR source with 40 emission points. Since the present ion current was limited by the current capacity of the extraction power supply, an ion current of more than 10 mA will be expected with a larger power supply. The results indicated that an ion current approximately proportional to the number of the emission points was obtained. This kind of ion source could be used as a general ion source in materials science.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144956
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  • 5
    Electronic Resource
    Electronic Resource
    The relationship between lifestyle, social characteristics and obesity in 3-year-old Japanese children (1999)
    Oxford, UK : Blackwell Science, Ltd
    Child 25 (1999), S. 0 
    Details
    ISSN: 1365-2214
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine , Psychology
    Notes: Summary It has been observed that obese children receive genetic and environmental effects that are associated with them being overweight. With regard to the latter, lifestyles such as eating habits and physical activity have been focused on. In the present study, the social characteristics which would dominate their lifestyles were investigated as background variables. For this purpose, 9668 Japanese children aged three years who were all born in Toyama prefecture, Japan, in 1998, served as birth cohort subjects. For the comparison between obese (Kaup index; mass in kg/(height in m)2〈inlineGraphic alt="geqslant R: gt-or-equal, slanted" extraInfo="nonStandardEntity" href="urn:x-wiley:03051862:CCH127:ges" location="ges.gif"/〉18) and nonobese (Kaup index 18) children, irregular snack intake, physical inactivity and reduced sleeping hours were chosen as statistically significant obesity-related lifestyle indicators for the children. For social characteristics, family construction (expanded family with grandparents/nonexpanded family), main caregiver (mother/other), attending a nursery school (yes/no) and mother’s employment (full-time worker/other) were chosen. These were significantly associated with the obesity-related lifestyles mentioned above using multiple logistic regression analysis adjusted for other variables of social characteristics as well as for gender and birth month (July–December/January–June). The two greatest population-attributable risk percentages were observed for mother as main caregiver (−36.5%) and attending a nursery school (−28.9%) for irregular snack intake. Therefore, these two social characteristics substantially reduced the number of children with irregular snack intake. On the other hand, the two social characteristics were reversed in children with reduced sleeping hours (population-attributable risk percentage of mother as main caregiver: 15.4%; attending a nursery school: 17%). In contrast with favourable effects on snack intake these social characteristics showed an adverse influence on the sleeping habits of children.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2214.1999.00127.x
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  • 6
    Electronic Resource
    Electronic Resource
    Secondary amyloidosis complicating arthropathic psoriasis (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental dermatology 21 (1996), S. 0 
    Details
    ISSN: 1365-2230
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We report a patient with secondary systemic amyloidosis complicating arthropathic psoriasis, At autopsy amyloidosis was observed in the spleen, kidneys, liver, gastrointestinal tract, lung, heart, pancreas, adrenal glands, thyroid and gall-bladder in addition to the skin by historical, histochemical and ultrastructural studies. The amyloid deposits in these organs were of amyloid A protein type.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2230.1996.tb00039.x
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  • 7
    Electronic Resource
    Electronic Resource
    Computer simulation of ultrahigh-density perpendicular magnetic recording : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5664-5666 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The possibility of ultrahigh-density recording higher than 10 Gb/in.2 with perpendicular magnetic recording is investigated by computer simulation for a ring-type head and single-layer medium combination. A nucleation model is used as a media model because it incorporates a nucleation site, which causes irreversible magnetization switching. Fundamental read–write characteristics are found to be entirely different from those of longitudinal recording. Recorded magnetization strongly depends on head field strength; the maximum magnetization appears around the head field strength of media coercivity, and beyond this the recorded magnetization decreases abruptly. Spacing loss in the recording process also depends on head field strength and recording density. However, saturation recording can be attained even at an ultrahigh recording density of 600 kFCI with a spacing of 30 nm. Also, a higher signal-to-noise ratio than in longitudinal recording can be obtained by introducing weak intergrain exchange interaction with a relatively large grain size in the media film. This suggests that perpendicular magnetic recording is stable in thermal fluctuation. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362209
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  • 8
    Electronic Resource
    Electronic Resource
    Sensitivity distribution asymmetries in magnetoresistive heads with domain control films (abstract) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6400-6400 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Suppression of the sidetrack reading behavior is important in achieving⋅high track-density recording with a magnetoresistive head. In the present work, we investigate the sensitivity distribution profiles of MR heads through experimentation using a microtrack technique1 and computer simulation. Shielded, soft, adjacent-layer-biased MR heads with 3∼6−μm-wide tracks are used. The ends of the MR elements are coupled to antiferromagnetic or hard ferromagnetic films for domain control. In the simulation based on the Landau–Lifshitz–Gilbert equation,2 the magnetization configurations in the MR elements of the domain stabilizing films are calculated to analyze the sensitivity distribution. The measured sensitivity profiles in all cases have asymmetries that are reversed when the sensing current direction or the magnetization direction of the MR element is reversed. These results agree with the simulation. The asymmetries of sensitivity profiles are explained by the magnetic poles at the domain control film edges and at the transverse edges of the element which generate a diagonal demagnetizing field distribution in the sensing region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355364
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of grain size, cluster size, and crystallographic orientation upon simulation of longitudinal recording media : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 3922-3924 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Simulations of hexagonal magnetic particles with uniform exchange energy and random c-axis in-plane orientation do not reproduce real media magnetic properties. Simulation software was thus modified to model four experimentally observed Co-alloy microstructures, to distinguish the effects of grain size, cluster size, exchange decoupling, and cluster substructure; and to more accurately model real media behavior. Results include: (1) Clusters of isolated uniaxial particles act like single grains having the cluster size. Exchange decoupling on a size scale smaller than the crystallographic grain size has little effect upon hysteresis loops or media noise. (2) The magnetic properties of clustered bicrystal and randomly oriented media depend on the exchange interactions within and between clusters of grains. Media hysteresis loops and recorded tracks are well simulated using exchange energies within randomly oriented or bicrystal grain clusters up to ten times larger than those used in the standard model. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365073
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  • 10
    Electronic Resource
    Electronic Resource
    Superpolished single-crystal molybdenum mirror for x-ray ultraviolet to x-ray radiation (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 1111-1113 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-quality single-crystal molybdenum (Mo) fabricated by a secondary recrystallization method has been polished with a new polishing technique. The superpolished surface of the Mo single crystal has a surface roughness of 3.5 A(ring) rms. This superpolished single-crystal Mo has been used for a high-power electron beam pumped argon excimer laser (λ=126 nm) as a cavity mirror. Peak output power of more than 3 MW has been achieved without any damage to the mirror surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99177
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