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  • 1
    Electronic Resource
    Electronic Resource
    Nanostructuring Materials for Spin Electronics (1997)
    Springer
    Europhysics news 28 (1997), S. 14-17 
    Details
    ISSN: 1432-1092
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Fundamental studies on magnetic superlattices have sparked intense research activity worldwide. This is now leading to the development of devices based on the transport of electronic spins
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00770-997-0014-8
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic Properties of Nanostructured Ferromagnetic Metals (1996)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 235-238 (Oct. 1996), p. 699-704 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/02/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.235-238.699.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    An NMR study of the geometry of a CO layer chemisorbed on Pt particles (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 5963-5971 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The authors have analyzed the shape of the 13C spin echo envelope of a 13CO layer chemisorbed on supported Pt particles. They show that it contains information about the geometry of the array of molecules on the surface. They find that two mechanisms are responsible for the shape. The coupling of the C spins with the surface Pt spins gives rise to a T2 of 2.9 ms at 77 K. By applying a Carr–Purcell sequence to the 13C spins, the effects of the coupling to the Pt can be eliminated. The dipolar coupling between 13C molecules then remains, producing a "slow beat'' in the spin echo envelope. It can be analyzed exactly since mutual spins flips among C spins are not allowed, owing to large field inhomogeneities at the surface of the Pt particles. Analysis of the slow beat yields information about the structure of the array. The authors report evidence for the coalescence of islands of CO at low coverage and demonstrate that the coverage is uneven among the Pt particles if the sample powder is exposed to less than a monolayer of CO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454509
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic properties of nanosized wires : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6010-6012 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Assemblies of ferromagnetic cylinders made of Ni with diameters ranging from 35 to 250 nm were produced by electrodeposition in nanoporous membranes. The large coercive fields of Ni nanowires at low temperature could be accounted for by the curling mode of magnetization reversal, taking into account the distributions of wire diameters and orientations. The coercive field of the nanowires of the smaller diameter range decreased from 1500 Oe at 20 K to 200 Oe at 300 K nearly linearly. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362136
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  • 5
    Electronic Resource
    Electronic Resource
    Arrays of multilayered nanowires (invited) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6090-6094 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Multilayered Co/Cu wires with a diameter of 80 nm and a length of 6 μm were produced by electrodeposition in nanoporous polycarbonate membranes. Their magnetoresistance has been measured in a geometry where the current was perpendicular to the layer plane. The anisotropic part of the magnetoresistance was limited to 1.5%. The study, for layer thicknesses ranging from 3 to 100 nm interpreted in terms of the Valet and Fert model, gave estimates of the spin dependent bulk and interface resistivities and their change with temperature. The large Co bulk resistivity value, caused by a large amount of Cu impurities, limited the magnetoresistance in our samples to 20% at room temperature and 30% at 20 K. The Cu spin flip mean free path was found to be temperature independent and determined by scattering at Co impurities in the Cu layer. It was measured for two sets of samples with different amounts of Co impurities. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362100
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  • 6
    Electronic Resource
    Electronic Resource
    Tailoring anisotropic magnetoresistance and giant magnetoresistance hysteresis loops with spin-polarized current injection (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 7127-7129 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Current pulses were injected into magnetic nanowires. Their effect on the magnetoresistance hysteresis loops was studied for three morphologies: homogeneous Ni wires, copper wires containing five cobalt/copper bilayers, and hybrid structures composed of a homogeneous Ni half wire and a multilayered Co/Cu half wire. The characteristic features of the action of the current on the magnetization are shown and discussed. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1357113
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  • 7
    Electronic Resource
    Electronic Resource
    Giant magnetoresistance of nanowires of multilayers (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 3019-3021 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new technique is required which enables tailoring of the morphology of a metallic nanostructured material down to the 10 nm length scale. Using nanoporous nuclear track etched membranes as templates for electrodeposition, an assembly of wires with diameters as low as 30 nm could be obtained. Alternating the electrodeposition of two metals resulted in multilayers grown perpendicular to the wire axis. Layer thicknesses as low as 2 nm could be reached. Application is demonstrated by making wires 6 μm long, 80 nm in diameter, having a succession of either Co and Cu layers or of (Ni,Fe) and Cu layers. Wires containing layers of 5–10 nm in thickness exhibited a giant magnetoresistance. The current was naturally perpendicular to the layers. At ambient temperature, a magnetoresistance of 14% for Co/Cu and of 10% for (Fe,Ni)/Cu was observed. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112495
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  • 8
    Electronic Resource
    Electronic Resource
    Dissipative evolution of quantum statistical ensembles and nonlinear response to a time-periodic perturbation (2003)
    Springer
    The European physical journal 36 (2003), S. 573-592 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We present a detailed discussion of the evolution of a statistical ensemble of quantum mechanical systems coupled weakly to a bath. The Hilbert space of the full system is given by the tensor product between the Hilbert spaces associated with the bath and the bathed system. The statistical states of the ensemble are described in terms of density matrices. Supposing the bath to be held at some - not necessarily thermal - statistical equilibrium and tracing over the bath degrees of freedom, we obtain reduced density matrices defining the statistical states of the bathed system. The master equations describing the evolution of these reduced density matrices are derived under the most general conditions. On time scales that are large with respect to the bath correlation time $\tau_{B}^{\mathrm{corr}}$ and with respect to the reciprocal transition frequencies of the bathed system, the resulting evolution of the reduced density matrix of the bathed system is of Markovian type. The detailed balance relations valid for a thermal equilibrium of the bath are derived and the conditions for the validity of the fluctuation-dissipation theorem are given. Based on the general approach, we investigate the non-linear response of the bathed subsystem to a time-periodic perturbation. Summing the perturbation series we obtain the coherences and the populations for arbitrary strengths of the perturbation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2004-00013-5
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  • 9
    Electronic Resource
    Electronic Resource
    Dielectric study of hollow microsphere composites (1994)
    Springer
    Journal of materials science 29 (1994), S. 2841-2846 
    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 Composites of epoxy resins filled with hollow microspheres of ceramics, glass and polymer were studied in an attempt to produce a material of low dielectric constant. The accumulation of interfacial water was tested for exposures to 85% humidity at 85° C for periods of up to 1000 h. Water absorption was monitored by gravimetry and dielectric measurements. With all but one type of microsphere, a dramatic increase of the dielectric constant developed after durations of exposure which were of the order of the Fickian diffusion time of samples of unfilled resin. Unfilled samples, on the other hand, did not exhibit this behaviour. Impedance spectroscopy carried out at frequencies of up to 1 GHz gave evidence for two distinct modes of ionic conduction: about the spheres and across the bulk of the sample. Microspheres of acrylonitrile-vinylidene chloride copolymer in amine-cured epoxy resins did, however, remain stable and therefore yielded a reliably low dielectric constant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01117591
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  • 10
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    Unknown
    Note: Stacked rings for terahertz wave-guiding (2011)
    American Institute of Physics
    Details
    Publication Date: 2011-06-01
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics
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