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  • 1
    Electronic Resource
    Electronic Resource
    Spin orientation in an exchange coupled Fe/Cr/Fe trilayer determined by polarized neutron reflection : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6295-6297 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have used polarized neutron reflection to determine the layer-dependent spin orientations in an antiferromagnetically coupled 100 A(ring) Cr/50 A(ring) Fe/15 A(ring) Cr/50 A(ring) Fe/Si sandwich structure prepared by sputtering. At low field, the net Fe layer magnetic moments align in an asymmetric canted orientation with a near zero total magnetic moment for the sample. At high fields, a canted state, nearly symmetric with respect to the applied field direction is observed and the magnetization in each layer does not reach the bulk saturation value until the layers are ferromagnetically aligned. The behavior is discussed in the context of current theories of exchange coupling. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362041
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  • 2
    Electronic Resource
    Electronic Resource
    Domain wall trapping in controlled submicron ferromagnetic elements (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 4727-4729 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The domain configuration in permalloy wires (30 nm thick, 10 μm wide, and 205 μm long) with a wide size range of a narrow central bridge (5 μm long and w μm wide; 0.5≤w≤10 μm) were investigated in both their demagnetized and remanent states using magnetic force microscopy and the results were confirmed by micromagnetic calculations. At the bridge region, domain walls were found to be shifted by a small external field. Scanning magneto-optical Kerr effect revealed that the coercivity in these structures are the same as that in a straight wire, suggesting that domain wall movement is the dominant process in the magnetization reversal of these structures. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373140
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  • 3
    Electronic Resource
    Electronic Resource
    Micromagnetism in mesoscopic epitaxial Fe dot arrays (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 7019-7021 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The domain structures of epitaxial Fe (20 nm)/GaAs(100) circular dot arrays (diameters from 50 to 1 μm) were studied with magnetic force microscopy. A transition from a single domain to a multidomain remanent state was observed upon reducing the dot diameter beneath 10 μm in dot arrays with the separation twice the dot diameter. When the separation is reduced to half the dot diameter, the single domain states were found to "collapse" into stripe-like multidomain states due to local dipole coupling between dots. Micromagnetic simulations further suggest that for ultrathin Fe dots of less than about 2 nm thickness the diameter does not have a significant influence on the domain structures due to a dramatic reduction of the dipole energy. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372917
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  • 4
    Electronic Resource
    Electronic Resource
    Domain nucleation processes in mesoscopic Ni80Fe20 wire junctions (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 3032-3036 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetization reversal process in permalloy (Ni80Fe20) wire junction structures has been investigated using magnetoresistance (MR) measurements and scanning Kerr microscopy. A combination of electron beam lithography and a lift-off process has been utilized to fabricate wires consisting of two 200 μm length regions with distinct widths w1 and w2 in the range 1–5 μm. Longitudinal MR measurements and magneto-optic Kerr effect hysteresis loops demonstrate that the magnetization reversal of the complete structure is predominantly determined by the wider region for fields applied parallel to the wire axis. Magnetic force microscopy and micromagnetic calculations show that several domain walls nucleate in the wider part and are trapped in the junction area. This implies that domain nucleation at the junction of the wire initiates magnetization reversal in the narrow half. As a consequence, the switching fields are found to be identical in both halves in this case. These results suggest the possibility of designing structures which can be used to "launch" reverse domains in narrow wires within a controlled field range. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372295
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of the spatial distribution of Y2BaCuO5 inclusions in large-grain YBa2Cu3O7-δ (1998)
    Springer
    Journal of materials science 33 (1998), S. 1083-1089 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract High values of critical current density, Jc, in large-grain superconducting melt-processed YBa2Cu3O7-δ (YBCO, Y-123) have been reported to correlate closely with the distribution of Y2BaCuO5 (Y-211) particles in the Y-123 phase matrix. Extensive image analysis of the homogeneity of the Y-211 particle distribution in a large-grain sample has been performed on high-resolution, secondary scanning electron micrographs of seeded melt-processed YBCO. The variation of key parameters, such as area fraction, number density and size along the a/b axis of the Y-123 grain has been investigated in detail as a function of distance from the centre of the seed. Both area fraction and number density of Y-211 particles are observed to increase continuously with distance, whereas the mean and standard deviation of the size distribution decrease slightly towards the grain boundary. This suggests that the increase in area fraction can be attributed to an increase in number density of the Y-211 particle distribution along the a/b axis of the specimen. The implications for Y-211 particle pushing, ripening and coalescence are discussed in the light of these results. © 1998 Chapman & Hall
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004392602238
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  • 6
    Electronic Resource
    Electronic Resource
    Etching of melt-processed YBa2Cu3O7−δ for SEM image analysis (1996)
    Springer
    Journal of materials science 15 (1996), S. 1833-1835 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00264069
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  • 7
    Electronic Resource
    Electronic Resource
    SmBa2Cu3O6.5 seed fabrication for seeded peritectic solidification of YBa2Cu3O7−δ (1998)
    Springer
    Journal of materials science 33 (1998), S. 133-137 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The availability of high quality SmBa2Cu3O6.5 seeds of known orientation is essential for the fabrication of a large grain YBa2Cu3O7−δ (YBCO) superconductor via a seeded peritectic solidification technique. The suitable seed must have a close lattice parameter match to YBCO and a relatively high melting temperature. We report a melt texturing process for the fabrication of SmBa2Cu3O7−δ (Sm-123) seeds using SrTiO3 to control grain nucleation. The physical and structural properties of the seeds were confirmed by differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Seeds prepared in this study were used to grow large single grain YBCO superconductors of up to 2 cm in diameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004353915075
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  • 8
    Electronic Resource
    Electronic Resource
    Evidence of an EGF/TGF-α - independent pathway for estrogen-regulated cell proliferation (1991)
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 46 (1991), S. 125-133 
    Details
    ISSN: 0730-2312
    Keywords: breast cancer cell line ; CAMA-1 ; Intron Differential RNA/PCR ; gene expression ; EGF receptor ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: To elucidate the relationship between epidermal growth factor (EGF)/transforming growth factor (TGF-α) and estradiol-17β (E) in cell proliferation, we examined their effects on the breast cancer cell line, CAMA-1. While E was able to consistently induce cell proliferation under a variety of experimental conditions, EGF/TGF-α was without effect. Despite the presence of the receptor (EGFR) gene, mature EGFR protein and mRNA were not detected by radioreceptor assay, 35S Met-labelling, and the Intron Differential RNA/PCR method under conditions in which cells remain responsive to E. Furthermore, TGF-α is not an autocrine factor in CAMA-1 cells. We demonstrated unequivocally that EGF/TGF-α interaction with EGFR is not an obligatory event in mediating estrogen-stimulated cell proliferation.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcb.240460206
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