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  • 1
    Electronic Resource
    Electronic Resource
    Identification of immobilized bacteria by aminopeptidase profiling (1989)
    s.l. : American Chemical Society
    Analytical chemistry 61 (1989), S. 1656-1660 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00190a011
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  • 2
    Electronic Resource
    Electronic Resource
    Spectroscopy and photodissociation dynamics of a two-chromophore system: Raman scattering as a probe of nonadiabatic electronic coupling (1991)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 95 (1991), S. 6129-6141 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100169a017
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis and ocular antihypertensive activity of new imidazolidine derivatives containing a .beta.-blocking side chain (1991)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 34 (1991), S. 3197-3204 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00115a008
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  • 4
    Electronic Resource
    Electronic Resource
    Zone-center magnons in dilute magnetic semiconductors : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 6112-6113 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A calculation of the frequency of a zone-center magnon in a dilute magnetic semiconductor is outlined. It is based on the moments of the imaginary part of the dynamic spin susceptibility. Results are obtained at low temperatures for Cd1−xMnxTe in the zero- and high-magnetic-field limits. Good agreement with experiment is found assuming that (1) the dominant anisotropy mechanism is the Dzyaloshinski–Moriya interaction and (2) nearest-neighbor Mn spins are not colinear in the zero-field ground state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347783
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  • 5
    Electronic Resource
    Electronic Resource
    Antiferromagnetic magnons in diluted triangular and Kagomé lattices (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5657-5657 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Numerical results are presented for the local field distribution and the distribution of linearized magnon modes in diluted triangular and Kagomé lattices. A nearest-neighbor antiferromagnetic Heisenberg spin Hamiltonian is assumed, and the linearization is carried out with respect to classical ground states obtained by means of an energy minimization algorithm.1 In the case of the triangular lattice, the density of states associated with a 20% vacancy concentration is used to calculate the magnon contribution to the specific heat. With an exchange integral inferred from the Curie–Weiss constant, quantitative agreement is obtained with the experimental results for La0.2Gd0.8CuO2 reported by Ramirez et al.2 over the interval 0.1 K≤T≤0.2 K. The behavior of the diluted Kagomé lattice is compared with that of the triangular array. In contrast to the latter, the local fields in the diluted Kagomé lattice take on the discrete values 2JS, JS, and 0. In the case of a 14% vacancy concentration, the distribution of magnon modes resembles that of the fully occupied array with a noncoplanar ground state. The relevance of these results to the behavior of SrCr8Ga4O19 is discussed.3
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353630
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  • 6
    Electronic Resource
    Electronic Resource
    Step-induced magnetic-hysteresis anisotropy in ferromagnetic thin films (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 3150-3153 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate the quasistatic magnetic hysteresis of ferromagnetic thin films grown on a vicinal substrate, using Monte Carlo simulations within a two-dimensional XY model. Intrinsic in-plane anisotropy is assigned to surface sites according to their local symmetry. The simulated hysteresis loops show a strong anisotropy: the coercive field is the largest when the external field is along the step direction and vanishes when the external field is perpendicular to the step direction. In general, the coercivity increases with increasing step density, but displays a more complex dependence on film thickness. The simulations also suggest that the mechanism for the magnetization reversal is coherent rotation. These results are in good agreement with experiments. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1433179
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  • 7
    Electronic Resource
    Electronic Resource
    Freezing of the extended state in the random local field theory of Ising spin glasses with long range interactions : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6143-6145 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The onset of spin glass freezing in dilute Ising systems with long range interactions is investigated within the framework of a random local field approach (previously developed for disordered ferromagnets and ferroelectrics) with the use of numerical simulations. The problem reduces to the diagonalization of an N×N random matrix, N being the number of spins in the simulation, whose elements depend on the spin–spin interaction and temperature. We identify the onset of spin glass freezing with the temperature at which this boundary eigenvalue separating localized and extended states is equal to one. Numerical simulations give a reasonable value of the freezing temperature for dilute RKKY spin glasses and reproduce its linear concentration dependence in agreement with the scaling relation. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362051
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  • 8
    Electronic Resource
    Electronic Resource
    Exchange stiffness of Ca-doped YIG : 38th Annual Conference on Magnetism an Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5517-5519 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An effective medium theory for the zero-temperature exchange stiffness of uncompensated Ca-doped YIG is presented. The theory is based on the assumption that the effect of the Ca impurities is to produce strong, random ferromagnetic interactions between spins on the a and d sublattices. In the simplest version of the theory, a fraction, x, of the ad exchange integrals are large and positive, x being related to the Ca concentration. The stiffness is calculated as function of x for arbitrary perturbed ad exchange integral, Jxad. For Jxad(approximately-greater-than)(1/5)||8Jaa+3Jdd||, with Jaa and Jdd denoting the aa and dd exchange integrals, respectively, there is a critical concentration, Xc, such that when x(approximately-greater-than)Xc, the stiffness is complex. It is suggested that Xc delineates the region where there are significant departures from colinearity in the ground state of the Fe spins. Extension of the theory to a model where the Ca doping is assumed to generate Fe4+ ions on the tetrahedral sites is discussed. Possible experimental tests of the theory are mentioned.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355674
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  • 9
    Electronic Resource
    Electronic Resource
    Analysis of electron paramagnetic resonance experiments in colossal magnetoresistance materials : 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. 6949-6951 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An analysis is given of recent electron paramagnetic resonance (EPR) experiments in manganite materials displaying colossal magnetoresistance behavior. These experiments have established that in highly homogeneous samples characterized by a single resonance line, the EPR linewidths above the critical region associated with the paramagnetic–ferromagnetic transition are inversely proportional to Tχ(T), where χ denotes the susceptibility. This behavior indicates that the linewidth does not reflect a coupling to the lattice vibrations but rather is caused by a spin-only mechanism. The possibility that the linewidth arises from the dipolar interaction is assessed using an effective interaction model. On the basis of the model calculation, it is concluded that the dipolar interaction is probably too weak to account for the observed broadening and that the linewidth most likely arises from tetragonal and orthorhombic distortions of the octahedral crystal field at the sites of the Mn ions. The EPR linewidth in samples with very low concentrations of Mn4+ ions is expected to vary with temperature as [Tχsp(T)]−1, where χsp(T) is the susceptibility of the ferromagnetically coupled spin polaron. By measuring the temperature dependence of the linewidth, one may be able to determine the temperature dependence of the polaron susceptibility. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367538
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  • 10
    Electronic Resource
    Electronic Resource
    Gain limitations of scaled InP/InGaAs heterojunction bipolar transistors (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 6444-6448 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate a current gain degradation mechanism in self-aligned InP/InGaAs heterojunction bipolar transistors. We show that surface level pinning at the emitter sidewall gives rise to a peripheral emitter injection current into the base which increases the base current due to electrons recombining at the base contacts. The surface charge at the extrinsic base surface causes the formation of a conducting channel which further enhances the electron flow from the emitter to the base contacts. Two-dimensional numerical simulations of the emitter region combined with Monte-Carlo simulations of the injection process at the abrupt base-emitter heterojunction are in good agreement with the measurements. This effect will be especially severe for submicron emitter widths where the emitter perimeter to emitter area ratio is large. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1369406
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