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  • 1
    Electronic Resource
    Electronic Resource
    Changes in film structure and increase in coercivity for Co/Pd multilayered films with atmospheric annealing (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 334-338 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Co/Pd multilayered films exhibit large perpendicular magnetic anisotropy and have attracted attention as new materials for recording media and for other applications. The coercivity (Hc), however, is small in as-sputtered films. We have found that Hc increased markedly with the atmospheric annealing at 300 °C to 2 kOe, and studied the change in film structure and reason of the increase in Hc with the annealing. The rf magnetron sputtering method was employed in fabricating the films. Film structure changes were observed by x-ray diffraction, Auger electron spectroscopy, transmission electron microscopy, energy dispersive x-ray spectrography, and atomic force microscopy. The increase in Hc was observed only in the atmospheric annealing, and not in the vacuum-annealing. The internal structure of films after the atmospheric annealing at 300 °C consisted of columnar parts that had the multilayered structure that undertook vertical magnetization and column boundaries being surrounded by Co oxides. As a consequence, domain wall binding occurs in the segregated areas of the oxides in the column boundaries, thereby increasing Hc.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353853
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  • 2
    Electronic Resource
    Electronic Resource
    Annealing effects on multilayered Co/Pt and Co/Pd sputtering films (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 1562-1564 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Effects of air annealing on magnetic properties and structures of multilayered Co/Pt and Co/Pd sputtering films were studied. The dual-source rf magnetron sputtering method was employed in fabricating the films. The thicknesses of the Co layer and Pt layer of the Co/Pt films were 4.3 and 10.0 A(ring), respectively: the total thickness was 4300 A(ring). The thicknesses of Co layer and Pd layer of the Co/Pd films were 3.6 and 11.8 A(ring), respectively: the total thickness was 5600 A(ring). Residual magnetizations and coercivities of the Co/Pt and Co/Pd films increased with air-annealing at 250–350 °C for 30 min to 2.5–3 kG and 2–3 kOe, respectively. The increases were observed only during air annealing, but not in vacuum annealing. Saturated magnetizations and intensities of the superlattice x-ray peak decreased uniformly relative to annealing temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108641
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic properties of multiple-structure multilayered Co/Pd films (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 510-511 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Co/Pt and Co/Pd multilayered films exhibit large perpendicular magnetic anisotropy and have attracted attention as new materials for magneto-optical recording media and for applications in other areas. The coercivity and the squareness ratio of these films are small at thick films of 1000 A(ring) or more. We studied Co/Pd multiple-structure multilayered films, consisting of periodic piles of Co/Pd multilayered film layers and Pd thin-film layers in order to improve the magnetic characteristics. By adopting such multiple structures, a squareness ratio of unity, coercivity of 2.5 kOe, and residual magnetization of 1.5 kG were obtained at a thick film of 2000 A(ring).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106592
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  • 4
    Electronic Resource
    Electronic Resource
    Structural instabilities and superconductivity in La-214 compounds (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 39-43 
    Details
    ISSN: 1572-9605
    Keywords: Low-temperature tetragonal (TLT) phase ; 1/8 problem ; La2−y−x Th y Ba x CuO4 ; La2−y−x Nd y Ba x CuO4 ; La2−x (Ba, Sr, Ca) x ,CuO4
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract In La2−x Ba x CuO4 (LBCO) the transition to a low-temperature tetragonal phase and the suppression of superconductivity occur at the carrier concentration p≈ 1/8 per copper. We will discuss the roles of various material parameters that control this instability. An unusual lattice softening has been found by ultrasonic measurement on La2−x Sr x CuO4 (LSCO). This softening is present only in an in-plane shearing mode and is ascribed to the growth of structural fluctuations in the normal state. These phenomena are closely related because both the structural change in LBCO and the applied strain in LSCO lift the degeneracy of in-plane oxygen sites. They clarify the importance of strong coupling between the normal-state electronic system and the lattice by a Peierls-type mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730365
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  • 5
    Electronic Resource
    Electronic Resource
    Lattice instability in the normal state of La2−x Sr x CuO4 (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 419-421 
    Details
    ISSN: 1572-9605
    Keywords: Ultrasonic experiments ; lattice instability ; single-crystalline LSCO ; electron-phonon coupling ; electronic band structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Novel softening has been found in the transverse elastic constant (C 11–C 12)/2 below 50 K in single-crystalline La1.86Sr0.14CuO4 (LSCO) by high-precision ultrasonic measurements in magnetic fieldsH along thec axis. With decreasing temperature, this lattice softening persists down to the superconducting transition temperatureT c(H), which is reduced to 14 K by applying fields up to 14 T. BelowT c(H) the softening turns to rapid hardening. This behavior indicates the presence of lattice instability of the orthorhombic (Bmab) structure in the normal state of LSCO, which disappears in the superconducting state. This is evidence for the intimate interplay between high-T c superconductivity and the lattice instability in LSCO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00724580
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  • 6
    Electronic Resource
    Electronic Resource
    Superconductivity in a layered perovskite without copper (1994)
    [s.l.] : Nature Publishing Group
    Nature 372 (1994), S. 532-534 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The compound Sr2RuO4 has been known for quite some time2. It is the n = 1 member of the homologous series expressed as Sr/7+1Ru/?O3/;+1, of which those members with "=1,2 and oo have been synthesized2'3. Single crystals of Sr2RuO4 used in the present study were grown in air by ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/372532a0
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  • 7
    Electronic Resource
    Electronic Resource
    Stability of the low-temperature tetragonal phase in La2−x Ba x CuO4 and related compounds (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 33-35 
    Details
    ISSN: 1572-9605
    Keywords: Low-temperature tetragonal (TLT) phase ; La2−x Ba x−y M y CuO4 (M=Sr or Ca) ; La2−x−y Nd y Ba x CuO4 ; ionic size
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract In La2−x Ba x CuO4 (LBCO), the structural transition to a low-temperature tetragonal phase below 60 K and suppression of superconductivity are observed when the carrier density isp ∼ 1 /8 per copper. The replacement by divalent ions smaller than Ba2+ suppresses the static deformation of the lattice. We have found that the variationsT d2 and superconducting transition temperatureT c are quantitatively characterized by the averaged ionic radius at the La site or lattice parameters. This aspect of substitution could be regarded as the effect of chemical pressure, since similar variations have been reported on applying hydrostatic pressure. In La2−x−y Nd y (Ba, Sr) x CuO4,T d2 increases with increasingy in a wide range ofp whileT c is suppressed only at p∼ l /8. The structural transition atT d2 here should be ascribed mainly to the crystallochemical origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730363
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