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  • 1
    Digitale Medien
    Digitale Medien
    An alternate route to giant magnetoresistance in MBE-grown Co–Cu superlattices (invited) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6174-6177 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Co–Cu superlattices grown by MBE in the (111) orientation show weak or nonexistent interlayer exchange coupling, yet several groups have observed large high-field magnetoresistance signals in excess of 30%. In the present work, we address some of the questions relating to GMR and the interlayer coupling by studying samples with atomically abrupt interfaces, as probed by real-time RHEED techniques, HRTEM, and spin-echo NMR. We propose that the lowered dimensionality of the structure leads to an enhancement of the scattering of conduction electrons from paramagnetic interfaces obeying a Langevin-like saturation at very high fields, well beyond the switching field of the Co layers. Scaling between the GMR and thermopower measurements suggests that a spin-dependent density of states at the Co–Cu interfaces is responsible for the observed magnetotransport behavior in these samples, rather than antiferromagnetically coupled Co layers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.355447
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  • 2
    Digitale Medien
    Digitale Medien
    Epitaxial strain, metastable structure, and magnetic anisotropy in Co-based superlattices (invited) : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5775-5779 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We explore the relationship between interface structure and magnetic anisotropy in three types of Co-based superlattices: Cohcp-Au; Cofcc-Cu; and Cohcp-Cr, grown epitaxially on GaAs(110). For very thin layers of Co, Co-Au, and Co-Cu superlattices exhibit a perpendicular easy axis due to magnetoelastic contributions to the anisotropy energy. The magnetic anisotropy in Co-Cr is found to be strongly dependent on growth conditions. At slow deposition rates of Co the interface between Co and Cr becomes diffuse as is evidenced by a low saturation moment and a shift toward perpendicular anisotropy whereas samples with abrupt interfaces show predominantly parallel anisotropy. The Cr layers grow in a metastable hcp phase which appears to be paramagnetic. The results illustrate the influence of the heterointerface on magnetic properties.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.350157
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  • 3
    Digitale Medien
    Digitale Medien
    Interface anisotropy in cobalt-based epitaxial superlattices (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5412-5414 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have measured the magnetic anisotropy in a series of Co-Au and Co-Cu superlattices prepared by molecular-beam epitaxy. Significant epitaxial strains give rise to a magnetoelastic contribution and a large crossover thickness (∼19 A(ring)) for perpendicular easy magnetization. The results are discussed in the context of a careful analysis of the interfacial strains and coherence determined by in situ time-resolved reflection high-energy electron diffraction techniques and x-ray scattering.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.344570
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  • 4
    Digitale Medien
    Digitale Medien
    Enhanced annealing kinetics in ion-implanted InxAl1−xAs studied by x-ray diffractometry (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 2267-2269 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report a rapid thermal annealing (RTA) enhancement of the structural coherence of Si-implanted InxAl1−xAs (x≈0.54) layers on (100)InP. Under these annealing conditions (750 °C for 30 s), the enhancement occurs only in implanted samples and is characterized by the appearance of pendellösung fringes in double-crystal x-ray diffraction. Measurements of the parallel (ε(parallel)) and perpendicular (ε⊥) lattice mismatch show a slight relaxation in ε⊥ during RTA without significant generation of dislocations (ε(parallel)=0). The results suggest an electronic mechanism for the increased efficiency of RTA in implanted samples.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.104895
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  • 5
    Digitale Medien
    Digitale Medien
    In situ thin-film texture determination (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 2151-2156 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A kinematic theory of reflection high energy electron diffraction (RHEED) is presented for textured polycrystalline thin films. RHEED patterns are calculated for arbitrary texture situations and for any general crystallographic orientation that may be encountered in thin-film growth. It is shown that the RHEED pattern can be used as a fast and convenient tool for in situ texture characterization. The approach also permits quantitative extraction of angular dispersion parameters which are useful for optimizing thin-film growth conditions. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.369519
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  • 6
    Digitale Medien
    Digitale Medien
    Virtual phase CCD x-ray detectors : International conference on synchrotron radiation instrumentation (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 2280-2283 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A two-dimensional charge-coupled device (CCD) detector, based on the Texas Instruments "virtual phase'' CCD, has been developed at the University of Michigan for synchrotron radiation applications. A series of performance tests were carried out at the LURE synchrotron facility, and the results show that the detector is ideally suited to measurements in dispersive absorption spectroscopy, high-resolution diffuse scattering, and small-angle scattering. The characteristics of the detector also show great promise for time-resolved experiments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1140793
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  • 7
    Digitale Medien
    Digitale Medien
    A virtual phase CCD detector for synchrotron radiation applications (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 2586-2591 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A two-dimensional charge coupled device (CCD) detector, based on the Texas Instruments "virtual phase'' CCD, has been developed for synchrotron radiation applications. Simultaneous near-edge and multilayer scattering experiments have been carried out with the detector on an energy-dispersive synchrotron beamline. The detector was used in an optical mode where the CCD element is coupled to a phosphor screen by a pair of focusing and demagnifying lenses. We report on the performance of the detector in this mode.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1140675
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  • 8
    Digitale Medien
    Digitale Medien
    CCD-based reflection high-energy electron diffraction detection and analysis system (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 1263-1269 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A CCD-based, computer controlled RHEED detection and analysis system that utilizes an on-chip integration technique and on-board data manipulation is described. The system is capable of in situ time-resolved measurements of specular and integral-order intensity oscillations, their phase differences, streak linewidths, and epitaxial layer lattice constants. The digital RHEED techniques are described in the context of Co/Au bilayer, GaAs/GaAs, and InxGa1−xAs/GaAs MBE growth. The system is compared to other RHEED detection devices.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1142483
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  • 9
    Digitale Medien
    Digitale Medien
    The Fluoroplatinates. II. Fluoroplatinic Acid (1953)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 75 (1953), S. 5734-5735 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja01118a506
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  • 10
    Digitale Medien
    Digitale Medien
    Reduced bias growth of pure-phase cubic boron nitride (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 1969-1971 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report results on an improved growth process for cubic boron nitride (c-BN) films. The films are deposited on a dc-biased silicon substrate using ion-assisted sputtering. First, we grow a BN template layer at a bias voltage which maximizes the sp3 content. After this template layer attains a thickness of ∼500 Å, corresponding to the coalescence of the mosaiclike grain structure, we find that we can reduce the substrate bias to about 50% of its initial value while sustaining pure phase c-BN growth. The reduction in nitrogen ion energy results in a dramatic increase in the growth rate as well as significantly improved film quality. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.119429
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