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  • 1
    Electronic Resource
    Electronic Resource
    Magnetoresistance of paramagnetic metallic layers sandwiched between ferromagnetic layers : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5861-5863 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental results on magnetoresistance of Fe/Cr/Fe trilayers and multilayers show a large enhancement of this magnitude for a thickness of approximately 10 layers and decreases exponentially with the number of layers. In this work it is proposed that the key point to understand these experiments may lay in the fact that the exchange field of the ferromagnets penetrates in the paramagnet as has recently been proposed by the authors to explain coupling energies in trilayers. Even if the decay length of the penetrating field is small, of the order of nearest neighbors in Fe, its magnitude is large (1000 T), larger than any applied saturation field. The ferromagnetic and antiferromagnetic configurations give rise to two different field configurations and therefore to two different values of the resistance. In the opinion of the authors this is controlled by the effective section that the electrons can go. Also, it is not doubtful that the magnetoresistance is large but that the magnetic field (scattering spin potential) that the electrons see is large. It is found that the magnetoresistance is very much structure or roughness dependent and increases, in first approximation, with its amplitude. The magnetoresistance depends exponentially with the number of paramagnetic layers with a 10–20-A(ring) decay length, but does not oscillate; it is a smooth function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350137
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  • 2
    Electronic Resource
    Electronic Resource
    The structure of liquid 1,2-dichloroethane by neutron diffraction. II. Pulsed neutron and isotope difference studies (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 3689-3699 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Pulsed neutron diffraction measurements have been made on liquid 1,2-dichloroethane-d4 (DCE). The wide momentum-transfer range (∼0.3–50 A(ring)−1) available has been used to further refine previously measured molecular structure parameters as well as to test the validity of the inelasticity corrections applied. A measurement using chlorine isotopes on a steady (reactor) source served to partially separate the chlorine–chlorine and the chlorine–carbon plus chlorine–deuterium correlations. The isotopic difference curves were then analyzed and the relevant features of the distribution of internal dihedral angles [P(τ)] obtained by adequate inversion of the experimental difference–functions. The intermolecular pair correlation function was then derived and both sets of functions (from pulsed and steady sources) are compared and tentatively assigned.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456850
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  • 3
    Electronic Resource
    Electronic Resource
    Correlation effects on Raman scattering from low-energy vibrational modes in fractal and disordered systems. I. Theory (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 2040-2045 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In disordered fractal or nonfractal systems, the disorder induces rapid fluctuations of the acoustical vibrational wave functions, so that statistics can be used to resolve the problem of Raman scattering from localized low-energy vibrations. We derive the expressions of light-vibration coupling coefficient, C(ω), as a function of the frequency ω, in the case of the dipole-induced dipole mechanism of susceptibility fluctuation and for different types of correlation, from full correlation to no-correlation. The results are compared to the existing numerical calculations. The expressions of C(ω) are determined for other mechanisms of susceptibility fluctuations, depending on an interaction propagating in the fractal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465267
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  • 4
    Electronic Resource
    Electronic Resource
    Quantum dynamical calculations in clusters of spin 1/2 particles: Resonant coherent quantum tunneling on the magnetization reversal : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6110-6112 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate the reversal of magnetization and the coherence of tunneling when an external magnetic field is rotated instantaneously in systems of a few (N) spin 1/2 particles described by an anisotropic Heisenberg Hamiltonian at T=0. The temporal evolution is calculated by a numerically exact solution of the time-dependent Schrödinger equation, and the mean value in time of each spin component is computed as a function of the magnetic field. The correlation function and the spectrum are analyzed in terms of the macroscopic quantum coherence. Our calculations demonstrate that this model for small (N〈11) magnetic particles exhibit collective tunneling of the magnetization only for some specific resonant values of the applied magnetic field, at variance with the Stoner–Wohlfarth model. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362103
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  • 5
    Electronic Resource
    Electronic Resource
    Nonhomogeneous magnetization reversal in 2D Ising clusters : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6019-6021 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have performed Monte Carlo simulations on 2D circular Ising clusters, studying the distribution of the magnetization within the cluster as well as the magnetization reversal process when an applied external field is suddenly changed. We have shown that for highly anisotropic systems (the Ising-like limit), the magnetization reversal process is not uniform in a wide range of temperatures. Spins having a lower coordination at cluster edges drive the reversal process, acting as nucleation centers. We have found that there is a connection between the roughness transition temperature and the differences in the time evolution patterns of the magnetization. Our simulations agree with experimental results on magnetization reversal of single domain particles. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362139
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  • 6
    Electronic Resource
    Electronic Resource
    Theory of magnetic imaging by force microscopy (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 1449-1451 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new method to obtain information about local surface magnetic properties has been proposed recently. This new technique is based on the idea of measuring magnetic forces with a scanning tunneling force microscope. In this work we present a theoretical analysis of the relevant forces involved in magnetic force microscopy. Recent experiments with high-resolution images of laser-written domains in a magnetic thin film are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99965
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  • 7
    Electronic Resource
    Electronic Resource
    Is the observed quantized conductance on small contacts due to coherent ballistic transport? (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 901-903 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This letter revises the interpretation of recent experiments showing quantized conductance on GaAs/GaAlAs constrictions or point contacts in terms of coherent ballistic and sequential transport. Our calculations show by using a first iterative self-consistent procedure that the experimental data can also be reconciled with sequential transport. The mean free path concept in the constriction is discussed in comparison with that of the reservoirs. We conclude that, for the higher modes, the former is much smaller than the latter, implying that in the constriction the transport may be sequential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102623
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  • 8
    Electronic Resource
    Electronic Resource
    Nanometer scale structure fabrication with the scanning tunneling microscope (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 244-246 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nanometer scale structures have been produced on atomically flat surfaces of metallic glasses using the scanning tunneling microscope in the tunneling mode with enhanced local current densities and strong electric fields. Depending on the current and the electric field enhanced diffusion, local crystallization of the glassy state or Taylor cone formation of the locally molten surface can occur. These structures provide a potential means of studying the behavior of matter at nanometer dimensions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98461
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  • 9
    Electronic Resource
    Electronic Resource
    Direct imaging of 13-A(ring)-diam Au clusters using scanning tunneling microscopy (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 1594-1596 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Controlled size clusters of Au with a diameter of 13 A(ring), prepared using a multiple expansion cluster source, have been supported on highly oriented pyrolytic graphite and observed with a scanning tunneling microscope. A reliable constant-current signature for a metallic cluster supported on a graphite substrate is identified. Images of the supported Au clusters are found to exhibit a narrow size distribution and a diameter which is in close agreement with the diameter predicted from conditions in the multiple expansion cluster source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98565
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  • 10
    Electronic Resource
    Electronic Resource
    Field-tuned quantum tunneling of the magnetization : 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. 6937-6939 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The response of the magnetization to a time-dependent applied magnetic field in single-spin models for uniaxial magnets is studied. We present staircase magnetization curves obtained from the numerically exact solution of the time-dependent Schrödinger equation. Steps are shown to correspond to field-tuned quantum tunneling between different pairs of nearly degenerate energy levels. We investigate the role played by different terms that allow for tunneling processes: transverse fields and second-order and fourth-order transverse anisotropies. Magnetization curves for nonsaturated initial states and for excited initial states showing steps when the field decreases in absolute value are also presented. These results are discussed in relation to recent experiments on high-spin compounds. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367531
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