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  • Springer  (16)
  • American Institute of Physics (AIP)  (5)
  • Wiley
  • Geological Society of America (GSA)
  • 1995-1999  (21)
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  • 1
    Digitale Medien
    Digitale Medien
    Thickness dependence of magneto-optical properties in face-centered-cubic Co/Cu(001) ultrathin films : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4977-4979 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Magneto-optical Kerr spectra of ultrathin Co films grown on Cu(001) surfaces have been measured in situ. The growth mode and the crystal structure have been investigating by reflection high-energy electron diffraction observation. A 20-A(ring)-thick fcc Co grown on Cu(001) had a lateral lattice constant of 3.59±0.01 A(ring), which was about 1.4% expanded compared with that of the bulk fcc Co. There was a remarkable difference above 4 eV in ωσyz spectra between 20- and 1000-A(ring)-thick films. ωσyz spectra for 20-A(ring)-thick Co film showed a resonance-type structure at around 5 eV. It is considered that the structure is caused by the lower energy shift of the 1→6 interband transitions due to the narrowing of the 3d bands. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.361609
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  • 2
    Digitale Medien
    Digitale Medien
    Magnetic tunneling effect in Fe/Al2O3/Ni1−xFex junctions : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6262-6264 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The dependence of the magnetoresistance ratio, ΔR/Rs, on the Ni content has been studied in Fe/Al2O3/Ni1−xFex (0≤x≤1) tunneling junctions. The value of ΔR/Rs at 4.2 K increased with increasing x and exhibited a maximum of ∼35% at x=0.8. The result is discussed by taking into account the spin-polarization of ferromagnetic electrodes. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.362028
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  • 3
    Digitale Medien
    Digitale Medien
    Comparison between giant magnetoresistance in Fe–Co–Ni/Cu multilayers and anisotropic magnetoresistance in the ternary alloys : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5187-5189 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The concentration dependence of giant magnetoresistance (GMR) at the second peak in the Fe–Co–Ni/Cu multilayers and that of anisotropic magnetoresistance in the Fe–Co–Ni ternary alloy films and ribbons in the fcc γ-phase structure have been systematically examined at 4.2 K and room temperature. The concentration dependence of the GMR ratio is well explained by taking into account the spin-dependent interface and bulk scattering and the spin-independent scattering. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.364460
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  • 4
    Digitale Medien
    Digitale Medien
    The electronic structure and energy level alignment of porphyrin/metal interfaces studied by ultraviolet photoelectron spectroscopy (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 1899-1901 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Electronic structures of 5, 10, 15, 20-zinctetraphenylporphyrin (ZnTPP)/metal (Au, Ag, Al, Mg) interfaces prepared in ultrahigh vacuum were investigated by ultraviolet photoelectron spectroscopy (UPS). We found that the electronic energy levels of ZnTPP align to the vacuum level of substrate metal, with a constant energy shift of vacuum levels across the interface. These findings cannot be explained by the simple models assuming vacuum level alignment at the interface. We also found that sample exposure to oxygen induces energy level shift in close relation with change of substrate work function at oxygen exposure. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.114370
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  • 5
    Digitale Medien
    Digitale Medien
    Diminished photoluminescence polarization due to exciton ionization in strained Si1−xGex/Si(001) quantum wells (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 3962-3964 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The photoluminescence (PL) of strained Si1−xGex/Si(001) quantum wells was measured in an edge-emitting configuration. The no-phonon PL was found to be polarized largely along the quantum-well plane at low temperature, whereas such in-plane polarization was diminished as the sample temperature was increased. Exciton dissociation occurring at higher temperature is responsible for the diminution of PL polarization, which is consistent with an analogous reduction of in-plane polarization due to field ionization of excitons. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.125507
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  • 6
    Digitale Medien
    Digitale Medien
    BamHI-SacI RFLP and Gm analysis of the immunoglobulin IGHG genes in the Northern Selkups (west Siberia): new haplotypes with deletion, duplication and triplication (1999)
    Springer
    Human genetics 〈Berlin〉 105 (1999), S. 530-541 
    Details
    ISSN: 1432-1203
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract. Gm immunoglobulin allotypes have been studied in 1157 individuals of seven Northern Selkup populations, which account for 80% of the entire population of this west Siberian tribe. This study confirms that the northern Selkup populations are a Caucasoid-Mongoloid hybrid. Restriction fragment length polymorphism (RFLP) analysis of the IGHG genes using double BamHI-SacI digests, performed on 475 DNA samples, allowed us to describe nine new BamHI-SacI haplotypes (BS47 to BS55), eight of them being characterized by IGHG gene deletion or duplication: G1 (BS49) or G4 (BS55) deletion, G4 duplication (BS51), GP-G2-G4 multigene deletion (BS50), duplication (BS48, BS53 and BS54) or triplication (BS52). A new rare Gm haplotype 15,16*;1,17;23 has been found associated with BS52. The BS51 haplotype characterized by a duplicated G4 gene (additional 7.85 kb G4 band identifying a new G4*C5 allele) was always found associated with the Gm 5*;3;23 haplotype. A high RFLP diversity has been observed for the Northern-Mongoloid haplotype Gm 15,16*;1,17;.. which was found (1) with the BS27 haplotype characterized by a 3-exon hinge G3 gene, (2) with two different GP-G2-G4 multigene duplications, BS53 and BS54 haplotypes, which differ by the size of the duplicated G4 genes, and (3) with the BS55 haplotype characterized by a G4 deletion. In the Northern Selkups, haplotypes with duplicated genes were observed at a higher frequency (24%) than haplotypes with deleted genes (6%).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004399900187
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  • 7
    Digitale Medien
    Digitale Medien
    Quantum Tunneling of D(H) Atoms and 2 – in Solid Hydrogen (1998)
    Springer
    Journal of low temperature physics 111 (1998), S. 453-461 
    Details
    ISSN: 1573-7357
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract This paper contains three results. First, the rate constants for the tunneling reaction HD + D → H + D 2 in solid HD increase steeply with increasing temperature above 5 K, while they are almost independent of temperature below 5 K. A mechanism of a vacancy–assisted tunneling reaction is proposed to account for this temperature dependence. Second, a hydrogen atom and a hydrogen molecule form a van der Waals complex in the Ar matrix at 20 K, where the tunneling reaction HD + D →H + D 2 takes place in this complex. The analysis of well–resolved ESR spectra of the complex determined the distance between a hydrogen atom and a hydrogen molecule as 2.3 – 2.5 Å. Third, the decay rate constants of $${\text{H}}_{\text{2}}^ - $$ anions in solid parahydrogen decrease with decreasing temperature below 6.6 K, attain the minimum value at 5 K, and then increase with decreasing temperature in the range of 5 → 2.7 K. The abnormal temperature dependence of the decay rate constants below 5 K is ascribed to a phonon–scattering process of quantum diffusion.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1022264509705
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  • 8
    Digitale Medien
    Digitale Medien
    Decay of 2 - Anions in Solid Parahydrogen via Two-Stage Quantum Tunneling Diffusion Processes (1999)
    Springer
    Journal of low temperature physics 114 (1999), S. 413-429 
    Details
    ISSN: 1573-7357
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Decay mechanism of H 2 - anions in X(γ)-irradiated solid para-H2 (p-H 2 ) has been studied using high-resolution ESR spectroscopy in the temperature range between 1.3–6.6 K. The results are summarized as follows. First,the decay rate constant of the 2 - anions is not proportional to initial yields of reactive species such as cations and H atoms but proportional to the concentration of less-reactive species of HD molecules in p-H2 . This result shows that the decay of the 2 - anion is due to the reaction neither with cations nor H atoms but with HD molecules originally contained in the p-H2 sample at natural abundance. Second,the decay rate constant of the 2 - anions increases proportionally with the increase in temperature below 3 K and decreases with the increase in temperature between 3–5 K,although it increases exponentially with the increase in temperature above 5 K. This result indicates that the decay rate constant of the 2 - anions is controlled by the rate constant for the diffusion of the 2 - anions via one-phonon assisted quantum tunneling below 3 K,two-phonon scattered or assisted quantum tunneling between 3–5 K,and thermally-activated process above 5 K.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1021850103903
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  • 9
    Digitale Medien
    Digitale Medien
    Experimental Observation of 2 – Anion and its para → ortho Conversion in Solid para hydrogen Using High–Resolution ESR Spectroscopy (1998)
    Springer
    Journal of low temperature physics 111 (1998), S. 509-514 
    Details
    ISSN: 1573-7357
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We present experimental observations and study of $${\text{H}}_{\text{2}}^ - $$ in solid parahydrogen. Since the parahydrogen molecule does not produce local magnetic fields, high–resolution ESR spectra of trapped radicals can be observed in the solid parahydrogen matrices. Using this high–resolution ESR spectroscopy, new quartet ESR signals were observed in γ–rays irradiated solid parahydrogen and assigned as $${\text{H}}_{\text{2}}^ - $$ In addition, para– $${\text{H}}_{\text{2}}^ - $$ was observed to convert into ortho– $${\text{H}}_{\text{2}}^ - $$ on the storage at 4.2 K. On the other hand, ortho–H 2 molecule converts into para– $${\text{H}}_{\text{2}}^ - $$ at cryogenic temperatures. The difference in the conversion between the H 2 molecule and the $${\text{H}}_{\text{2}}^ - $$ anion is explained by the parity conservation law of wavefunctions on exchanging the protons in homonuclear diatomic molecules such as the $${\text{H}}_{\text{2}}^ - $$ anion and H 2 molecule.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1022280913340
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  • 10
    Digitale Medien
    Digitale Medien
    Experimental and theoretical phase diagrams of the iron-rich Fe-Si-Ge ordering system (1995)
    Springer
    Journal of materials science 30 (1995), S. 5056-5064 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The phase separation in iron-rich Fe-Si-Ge ternary alloys was investigated by means of transmission electron microscopy. The phase separations into A2 and D03 were recognized in several alloys in addition to the phase separation into B2 and D03 which has already been found in Fe-Si and Fe-Ge binary systems. On the basis of TEM observations, isothermal section diagrams are proposed for the iron-rich corner at 823, 873, 923 and 973 K. The A2 + D03 two-phase field exists in a band-shaped region at 823 K. With increase in temperature,the A2 + D03 field gradually shrinks and is eventually replaced at 973 Kwith the B2 + D03 field, which extends from both the Fe-Si and Fe-Ge binary sides. The phase diagrams were well reproduced by the calculations based on the so-called Bragg-Williams-Gorsky approximation, taking account of the chemical and magnetic pair interactions up to the second nearest neighbour. The effects of the magnetism on the equilibria are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00356049
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