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  • 1
    Electronic Resource
    Electronic Resource
    Be-Cr-doped high-corrosion-resistant magneto-optical disks : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4764-4766 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The addition of Be to TbFeCo thin-film layers results in the gradual deterioration of carrier-to-noise ratio (CNR) and optimized recording power Pw compared with that of Cr. Be and Cr composite-doped disks, whose CNR maintain over 54 dB at a recording frequency of 1 MHz, prevent bit-error-rate (BER) levels from increasing in accelerated environmental tests. It is noted that even prior to environmental stability testing, BER of Be-Cr composite-doped disks is less than that of nondoped disks. From the results obtained by Auger electron spectroscopy analysis, it is explained that this difference is caused by fluctuations in the reflections of disks resulting from varying thicknesses of extra layers formed as a result of reaction between TbFeCo and SiN. Finally, through the write-erase cycle test and differential scanning calorimetry analysis, it has been demonstrated that Be-Cr-doped disks possess a higher thermal durability than nondoped disks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348272
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  • 2
    Electronic Resource
    Electronic Resource
    Ferromagnetic amorphouslike oxide films of the Fe2O3-Bi2O3-PbTiO3 system prepared by rf-reactive sputtering (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 3663-3669 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper, the magnetic properties of ferromagnetic oxide films of the ternary Fe2O3-Bi2O3-PbTiO0 system prepared by rf-reactive sputtering are presented. As-sputtered films deposited at a substrate temperature below 400 °C are amorphous and behave paramagnetically. Amorphous films like these whose composition corresponds to the perovskite solid solution of BiFeO3 -PbTiO3 become crystalline with a perovskite structure on annealing in air, but no distinct spontaneous magnetization appears. On the contrary, in certain compositions in the Fe2O3 -Bi2O3 -PbTiO3 system, the samples retain a glassy (or amorphouslike) state even when the samples were annealed at around 600 °C. Also a spontaneous magnetization appears at room temperature. The maximum room-temperature saturation magnetization 4πMs achieved in this system is 1.67 kG with the composition 0.74Fe2O3 -0.16Bi2O3 -0.10PbTiO3. Experiments imply that the amorphous state is essential for establishment of strong ferromagnetism in the sputtered oxide films. Mössbauer spectroscopy and x-ray photoelectron spectroscopy were performed to examine the microscopic properties of the films that lead to ferromagnetism. The optical transmissivity and magneto-optical Faraday effect of the films are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348483
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  • 3
    Electronic Resource
    Electronic Resource
    Film structure and magnetic properties of ferromagnetic amorphous Bi2O3-Fe2O3-PbTiO3 films prepared by rf-reactive sputtering (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 3760-3764 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Amorphous-like oxide films of the Bi2O3-Fe2O3-PbTiO3 ternary system prepared by rf-reactive sputtering exhibit ferromagnetism and ferroelectricity simultaneously well above room temperature. In this paper, we have investigated the relation between the film structure and the magnetic properties of the films by means of x-ray diffractometry, transmission electron microscopy, magnetization measurement with a vibrating-sample magnetometer, and Mössbauer spectroscopy. The film composition used in the study is 0.16Bi2O3-0.74Fe2O3-0.10PbTiO3, which attains the maximum magnetization in this ternary system. It is revealed that ferromagnetism originates from the amorphous part in the films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349230
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  • 4
    Electronic Resource
    Electronic Resource
    Composition dependence of lattice spacing for low dislocation density undoped liquid encapsulated Czochralski GaAs crystals (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 182-184 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Crystals with varied composition were pulled by the As-partial-pressure controlled liquid encapsulated Czochralski method. The dislocation density was found to be as low as 2×103 cm−2 at the cores of the crystals. Lattice spacing (d) was measured with a precision of Δd/d ∼ 5.9 × 10−6 using synchrotron radiation. For a variation of 7×10−5 in the As-atom fraction in the crystals, the lattice spacing varied by less than 1×10−5 A(ring).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347740
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic anisotropy by ferromagnetic particles alignment in a magnetic field (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4493-4495 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic and optical properties of films composed of ferromagnetic fine particles aligned in a magnetic field were investigated. The spin-coated films were prepared by using a solution of magnetite fine particles dissolved in water-diluted polyvinyl alcohol (PVA) on glass substrates, and followed by drying at 80 °C and solidifying at 200 °C in a magnetic field. Linear-chain clusters of magnetite particles were formed in a considerably weak field below 1 kOe, which give rise to magnetic and optical uniaxial anisotropies. Both properties vary depending on preparation conditions such as the particle concentration, the viscosity of the solution, and the field strength during drying.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344892
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  • 6
    Electronic Resource
    Electronic Resource
    Depth selective Mössbauer spectroscopic study of Fe3O4 epitaxial films (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 1735-1740 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Several (111) oriented 56Fe3O4 films containing a 5-A(ring)-thick 57Fe3O4 probe layer at or below the surface were grown epitaxially on the α-Al2O3 (0001) surface by a reactive vapor deposition method. Conversion electron Mössbauer spectroscopy was applied at 6, 78, and 300 K by using a recently developed helium-filled proportional counter. The well-crystallized surface has been found to be surprisingly stable even in air as characterized by the Mössbauer parameters that are almost the same as for the bulk. Moreover, the Verwey transition was detected clearly even in the 5-A(ring)-thick surface layer. However, the ferrous components seem to have changed their Mössbauer parameters probably because of their sensitivity to any crystalline field modifications in the surface. Generally speaking, the quality of epitaxial Fe3O4 films is very high: Any unusual surface state, if present, is confined in a shallow depth of ≤ 5 A(ring).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346602
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  • 7
    Electronic Resource
    Electronic Resource
    A tunneling instrument for angle resolved tunneling spectroscopy (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 2424-2426 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new tunneling instrument has been developed to observe the anisotropy of the Fermi surface. This instrument has two advantageous mechanisms over the conventional scanning tunneling microscope (STM); a tilt mechanism to keep two crystals parallel to each other and a rotation mechanism of the proven crystal over the sample crystal. We have evaluated its performance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142524
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  • 8
    Electronic Resource
    Electronic Resource
    Deposition of fluoropolymer thin films by vacuum-ultraviolet laser ablation (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 1370-1372 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Crystalline thin films of polytetrafluoroethylene were deposited on Si(100) wafers by F2 laser (157 nm) ablation in 200 mTorr Ar gas atmosphere. X-ray photoemission spectra indicated that the composition of the deposited films was similar to the source material. The surface morphology of films deposited at room temperature contained numerous fibrous structures in size of 100–400 nm, but they were smoothed out at elevated wafer temperature of ∼370 K, while the crystalline feature was still maintained. The refractive index was ∼1.35 at 633 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112055
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  • 9
    Electronic Resource
    Electronic Resource
    Excitation of electrostatic ion cyclotron waves by a power-modulated transversely excited atmosphere (TEA) CO2 laser (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 1154-1159 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electrostatic plasma waves are excited in a laboratory plasma by means of the ponderomotive force of a high-power, power-modulated transversely excited atmosphere (TEA) CO2 laser beam [W. W. Duley, CO2 Lasers (Academic, New York, 1976), Chap. 2.5]. The strengths of the magnetic field, for which the plasma waves are excited selectively, and the group velocity of the excited plasma waves are consistent with the dispersion relation of the electrostatic ion cyclotron wave. This wave-excitation experiment gives proof to the principles of the driven scattering plasma diagnostics which has been proposed as a method for the ion temperature measurement of high-temperature plasmas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860905
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  • 10
    Electronic Resource
    Electronic Resource
    Productin of Basic Fetoprotein in Human Peripheral Lymphocytes during Blastic Transformation (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of immunology 36 (1992), S. 0 
    Details
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: To clarify the significance of basic fetoprotein (BFP) in lymphocytes, we investigated whether BFP is produced in lymphocytes during blastic transformation. Peripheral blood lymphocytes obtained from 14 adults were cultured under the stimulation of lectins. The concentration of BFP in the culture medium (extracellular BFP) was estimated serially. The incorporation of [6-3 H] thymidine was assayed simultaneously. The intracellular BFP was measured by dual flow cytometry for DNA and BFP. A lymph node was studies immunohistochemically. Serum BFP was measured in four cases of lumphocytic leukaemia. In two cases, dual staining was performed. The intracellular BFP of the mitogen-stimulated lymphocytes was increased within 24 h. The extracellular BFP was increased exponentially from 72 h. The extracellular BFP at 96 h did not correlate with the [3H]-thymidine incorporation. The intracellular BFP increase began in G1 phase. Immunostaining showed that the B cells also produced BFP. Theserum BFP level in leukaemia was high in 1 of 4 cases and the leukaemic cells in two cases showed high intracellular BFP content. These observations indicate that BFP is produced in activated human lymphocytes and in lymphocytic leukaemic cells. The production of BFP during blastic transformation will be a useful new in vitro model for studying the biological role of BFP, and BFP labelling may offer some new possibilities for study of lymphocytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3083.1992.tb03228.x
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