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  • 1
    Electronic Resource
    Electronic Resource
    Sputter deposited (CoNi)xO1−x composite materials (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. 4689-4689 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: (CoNi)xO1−x films have been studied extensively for use in high density recording tape media. Fabricated using metal evaporation in a partial pressure of oxygen, these films have exhibited high coercivity with improved corrosion and wear resistance. These attributes appear to be due to the inclined columnar microstructure in which the metal core is surrounded by a magnetic oxide phase. The coercivity could be varied by simply adjusting the atomic ratio of metal to oxide concentration. These properties as well as the possibility of an increased exchange anisotropy field make (Co0.5Ni0.5)xO1−x an interesting material to investigate as a candidate for future high density recording media. We investigated (CoNi)xO1−x composite films using reactive dc magnetron sputtering from a CoNi alloy target in an Ar and O2 environment. The oxide composition of the films was changed by systematically controlling the O2 partial pressure. X-ray diffraction results show that the films consisted of fcc CoNi metal and a fcc oxide phase. The oxide phase consisted of a mixture of NiO, CoO, or CoNiO2. Both the metal and the oxide phase showed a preferential (111) orientation. Calculated using x-ray peak broadening, the crystallite size was observed to decrease from 230 to less than 100 Å with increasing O2 flow rate. Magnetic measurements showed that the saturation magnetization (Ms) decreases from 1000 to 60 emu/cm3 and that the coercivity (Hc) increases from 30 to 300 Oe with increasing O2 flow rate. The easy axis of magnetization appears to be in-plane. Plausible models for the exchanging coupling behavior in composite materials will be discussed.© 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365527
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  • 2
    Electronic Resource
    Electronic Resource
    Sputter deposited Co/CoO composite materials : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5072-5074 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic composites consisting of ultrafine particles of Co and CoO were prepared by dc reactive magnetron sputtering in a Ar+O2 gas mixture. The films were composed of 60–140 A(ring) particles of hcp Co and fcc CoO. The magnetization, coercivity, and particle size were found to be dependent on the O2 partial pressure, such that the magnetization decreased and the coercivity increased to a maximum value of 1000 Oe with increasing O2 partial pressure. A shift in the hysteresis loop was observed for several samples, indicating exchange coupling between the Co and CoO. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361578
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  • 3
    Electronic Resource
    Electronic Resource
    Further evidence for the presence of c=38.2 A(ring) phase in a Bi-Ca-Sr-Cu-O superconductor (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 615-617 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Results of high-resolution electron microscopy, convergent beam electron microscopy, and x-ray microanalysis on the high Tc phase are reported. Local inhomogeneities in the structure and composition have been observed along the c direction. Both c=30.56 A(ring) (8ap) and c=38.2 A(ring) (10ap) have been observed inside the same grain. The regions with the larger c parameter correspond to regions with higher Ca and Cu concentration suggesting that the range of transition temperatures observed (85 to 115 K) is due to the coexistence of such regions of c=38.2 A(ring) and c=30.56 A(ring).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99869
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  • 4
    Electronic Resource
    Electronic Resource
    Structure and composition of the 115 K superconducting phase in the Bi-Ca-Sr-Cu-O system (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 520-522 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Results of convergent beam electron diffraction and energy dispersive x-ray (EDX) microanalysis of Bi1.2Ca0.9Sr0.9Cu2Oy superconductor are reported. The structure is orthorhombic with a=5.63 A(ring), b=5.4 A(ring), and c=38.2 A(ring). The c parameter is different from those reported by other workers and suggests that two extra perovskite units ap, where ap=3.82 A(ring), have been introduced leading to c=10ap. EDX microanalysis shows that the Cu content of this phase is higher than that reported by other workers. It is suggested that the phase with c=38.2 A(ring) may be the higher temperature (115 K) superconductor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100623
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  • 5
    Electronic Resource
    Electronic Resource
    Grain boundaries and defects in superconducting Bi-Sr-Ca-Cu-O ceramics (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 379-387 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Defects and structural interfaces in superconducting Bi-Sr-Ca-Cu-O have been characterized by transmission electron microscopy. The superconducting phase exhibits frequent variations in the stacking sequence (polytypoids). Dislocations, observed inside the grains, either introduce or accommodate the shear in the a-b plane and the local composition fluctuations. In general, the grains exhibit a platelike morphology with the a-b plane as the grain boundary plane. Grain boundaries along the short edge are generally disordered, whereas those near the long edge generally have a thin layer of the lower Tc polytypoid. Coherent intragranular boundaries are also observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345266
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  • 6
    Electronic Resource
    Electronic Resource
    The initial stages of adsorption of plasma derived proteins on artificial surfaces in a controlled flow environment (1985)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 19 (1985), S. 57-66 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Surfaces of amorphous carbon, polystyrene, and polycarbonate were exposed to solutions of fibrinogen, a modified fibrinogen which lacked the alpha chain protuberance, and serum albumin. The results were studied by electron microscopy. The exposures occurred in a well characterized flow environment at a shear rate of 135/s. All three protein species formed a film when adsorbed to carbon films. When the proteins were adsorbed to polystyrene surfaces, formation of a network was observed. Polycarbonate surfaces adsorbed the proteins both as a network and as a continuous film. It was observed that the nature of the adsorption process depended upon the specific combination of molecule and material. For example, on carbon, individual fibrinogen molecules retain their trinodular structure and adsorb randomly until a monolayer forms. On polystyrene, the individual fibrinogen molecules appear as globules and a network forms before complete coverage occurs.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820190106
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