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  • 1
    Digitale Medien
    Digitale Medien
    Simultaneous observation of the smoke signals during the growth of bcc Fe on the Ag(100) surface (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5394-5396 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Simultaneous observation of the surface magneto-optic Kerr effect (SMOKE) and reflection high-energy electron diffraction (RHEED) intensity oscillation was done during the epitaxial growth of bcc Fe on fcc Ag(100) surface. The SMOKE system using the high-frequency (100 kHz) ac method has a high sensitivity (10−4 deg) and is able to obtain an absolute value of the Kerr rotation angle (φK ). φK of Fe/Ag(100) was measured at room temperature under magnetic fields of 0 and 100 Oe. When film thickness (d) is thicker than five monatomic layers (ML's), φK of the longitudinal Kerr effect at 100 Oe increases with increasing d. No longitudinal SMOKE signal, however, was observed below 5 ML, while a polar Kerr signal was observed only in the range of 4 ML〈d〈5 ML. This suggests that the magnetic easy axis changes from perpendicular to in-plane at 5 ML, and below 4 ML the film is hardly magnetized by 100 Oe because of its high coercivity. These properties are discussed in relation to the crystal growth mechanism.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.344564
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  • 2
    Digitale Medien
    Digitale Medien
    Structure and magnetic properties of single-crystal Fe/Au(100) superlattices synthesized using RHEED oscillation (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5403-5405 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Single-crystal bcc-Fe/fcc-Au(100) artificial superlattices have been synthesized by the molecular-beam epitaxy (MBE) method using reflection high-energy electron diffraction (RHEED) intensity oscillation. Magnetic properties of the superlattices consisting of the alternations of about 3.6 ML of Fe and Au layers have been studied. The extrapolated magnetic moment per Fe atom at 0 K is estimated as 2.18±0.10 μB. An enhancement of the Fe moment predicted theoretically has not been observed. The linear temperature dependence of magnetization is observed below 200 K in the Fe/Au superlattices. It turns out that the magnetocrystalline anisotropy (Ku) which points to film normal as an easy axis appears after subtracting the shape anisotropy energy. The magnitude of the Ku corresponds with the value theoretically predicted. Annealing experiments have been also done.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.344567
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  • 3
    Digitale Medien
    Digitale Medien
    Effect of CoFe composition of the spin-valvelike ferromagnetic tunnel junction (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6055-6057 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The magnetoresistance (MR) ratio of a ferromagnetic tunnel junction with a spin-valvelike structure of NiFe/CoFex/Al–O/CoFex/NiFe/IrMn/Al is dependent upon CoFe composition. MR ratio increases with increasing Fe content, and shows a maximum of 42% for Fe content 26 at. % after annealing at 225 °C. Before annealing, the bias voltage dependence depend on Fe content, however, the bias voltage dependence did not depend on Fe content after annealing. We think that the increasing defect states in the barrier layer with the increasing Fe content in CoFex layer cause the degradation of the bias voltage dependence. After annealing, the defect states of samples decrease to same level, and the bias voltage dependencies of samples are improved and become same. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.372610
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  • 4
    Digitale Medien
    Digitale Medien
    Ferromagnetic tunnel junctions with plasma-oxidized Al barriers and their annealing effects : The 7th joint MMM-intermag conference on magnetism and magnetic materials (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 6691-6693 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Cross-geometrical Ni–Fe/Co/Al–AlO/Co/Ni–Fe/Fe–Mn/Ni–Fe tunnel junctions were fabricated by magnetron sputtering. To form the insulating layer, an Al layer was reverse sputtered in an atmosphere of either oxygen or oxygen–argon mixture at low power after deposition. The oxidization time necessary to form an AlO barrier was much shorter than that by natural oxidization, lasting for only a half to a few minutes. By adding argon to oxygen, the oxidization was slowed down and high MR ratios were obtained for a wide range of time. A magnetoresistance (MR) ratio of 16% was observed in the as-deposited junction when the barrier was oxidized in oxygen plasma for 35 s. In addition, the MR ratio increased to 24% by annealing at 300 °C. In as-deposited junctions, the tunnel resistances were increased by increasing the plasma oxidization time, but the MR ratios gradually decreased. The estimated tunnel barrier width increased and the barrier height decreased with the plasma oxidization time. After annealing, the MR ratio increased only for those junctions oxidized for short times. This suggests that the remaining Al between the AlO and the Co surface plays an important role in the effects of annealing. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.367933
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  • 5
    Digitale Medien
    Digitale Medien
    New gettering using misfit dislocations in homoepitaxial wafers with heavily boron-doped silicon substrates (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 463-465 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The gettering mechanism due to misfit dislocations in P/P+ epitaxial wafers is clarified for copper-diffused epitaxial wafers. The epilayer thickness of the sample is 2.2 μm and the substrate resistivity of the sample is 0.0015–0.002 Ω cm. It is dipped in a Cu(NO3 )2 -HF solution and annealed at 900 °C for 30 min. The in-depth Cu profile obtained by secondary-ion mass spectroscopy shows a distinctive peak at the P+ -substrate side in the vicinity of the epi/sub interface. This peak coincides with that of dislocation density for their location in depth. Furthermore, from energy dispersive spectroscopy observation the diffused copper is found to be effectively gettered at misfit dislocations as copper silicide from moiré fringe.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.100953
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  • 6
    Digitale Medien
    Digitale Medien
    A new method for spectroscopy of liquid surface waves over the frequency range from 500 Hz to 40 kHz (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 5377-5380 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A simple method has been developed for measuring the propagation of liquid surface waves over a frequency range from 500 Hz to 40 kHz. A new type of electromagnetic wire transducer was successfully employed to generate liquid surface waves at such high frequencies. Surface waves were detected by an optical probe with spatial resolution as high as 30 μm, which determined the high-frequency limit of the measurement.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1143406
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  • 7
    Digitale Medien
    Digitale Medien
    Hyaline bodies in ameloblastoma: histological and ultrastructural observations (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 14 (1985), S. 0 
    Details
    ISSN: 1600-0714
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: An exceedingly rare case of ameloblastoma. plexiform type, which contained numerous hyaline bodies was reported. Hyaline bodies occurred within the parenchyma, and showed similar histochemical reactions to those of hyaline bodies in odontogenic cysts. Ultrastructurally, hyaline bodies found in the present case of ameloblastoma were composed of a peripheral electron-dense area and central electron-lucent area. Well-developed endoplasmic reticulum containing electron-lucent and homogeneous substance were seen in the epithelial cells adjacent to hyaline bodies. Furthermore, electron-dense spherical granules, with or without limiting membrane, were scattered in the cytoplasm of epithelial cells. It is thought that hyaline bodies in the present case of ameloblastoma are particular products formed by odontogenic epithelial cells.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1600-0714.1985.tb00541.x
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  • 8
    Digitale Medien
    Digitale Medien
    Interleukin-4 Acts as a Potent Stimulator for Expression of Monocyte Chemoattractant JE/MCP-1 in Mouse Peritoneal Macrophages
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 203 (1994), S. 562-569 
    Details
    ISSN: 0006-291X
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1006/bbrc.1994.2219
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  • 9
    Digitale Medien
    Digitale Medien
    Expression of the RAG-2 gene in murine central nervous system tumor cell lines
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 181 (1991), S. 151-158 
    Details
    ISSN: 0006-291X
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1016/S0006-291X(05)81394-4
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  • 10
    Digitale Medien
    Digitale Medien
    Harmonic Ion Cyclotron Resonances observed by the OGO–4 Satellite (1970)
    [s.l.] : Nature Publishing Group
    Nature 225 (1970), S. 257-258 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] This communication is concerned with a new phenomenon associated with these proton whistlers which has been observed in the VLF recordings from the OGO?4 satellite. The new effect appears on a frequency?time spectrogram as several separated, narrow, steady bands of noise whose centre lines are ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/225257a0
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