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  • 1
    Electronic Resource
    Electronic Resource
    Control of magnetic anisotropy in Fe1−xCox films on vicinal GaAs and Sc1−yEryAs surfaces (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 6674-6676 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We demonstrate that two distinct surface contributions to the magnetocrystalline anisotropy can be used to control the magnetic properties of thin films of bcc Fe1−xCox grown on GaAs (100) and Sc1−yEryAs (100). The bare GaAs (100) surface has twofold symmetry, and Fe1−xCox films grown directly on it show a strong uniaxial magnetic anisotropy. Fourfold symmetry is restored in films grown on interlayers of Sc1−yEryAs, in which the rock-salt structure provides a fourfold symmetric surface. A uniaxial magnetic anisotropy can be induced in this case by miscutting the substrate towards a {111} plane, so that vicinal steps run along a 〈011〉 direction. A simple Néel pair-bonding model describes the evolution of the anisotropy with the degree of miscut. For miscut GaAs (100) surfaces without interlayers, both the intrinsic anisotropy originating from the surface bonding and a step-induced term contribute to the total magnetic anisotropy. Depending on the orientation of the miscut, the step contribution can either enhance or partially suppress the intrinsic uniaxial anisotropy. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1355320
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  • 2
    Electronic Resource
    Electronic Resource
    Torsional oscillator magnetometer for high magnetic fields (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 4161-4166 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have designed and constructed a torsional oscillator magnetometer for use in magnetic fields up to 25 T. The anisotropic component of the magnetization is detected by measuring the shift in the resonant frequency of the oscillator, which is fabricated from a single-crystal silicon wafer using micromachining techniques. The frequencies for the oscillators described here are between 100 Hz and 1 kHz and can be measured with a resolution of order 1 part in 108 in a 10 s averaging time, allowing for the detection of magnetic moments of 2×10−11 J/T at 1 T. Our oscillators are optimized for experiments on GaAs-AlGaAs heterostructures, but the method is suitable for any sample with an anisotropic susceptibility. We have applied the technique to two systems, a quasi-one-dimensional spin chain and a two-dimensional electron gas. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147562
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  • 3
    Electronic Resource
    Electronic Resource
    Near-field scanning optical spectroscopy of an InGaN quantum well (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 927-929 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Near-field scanning optical microscopy is used to image photoluminescence (PL) in an InGaN/GaN quantum well (QW) with spatial resolution of approximately 100 nm for temperatures between 50 and 295 K. Strong (∼50%) fluctuations in the quantum well photoluminescence as well as a tenfold enhancement of deep level-related emission at lower energies occur at large (∼500 nm diam) pits in the heterostructure. Regions of smaller (∼15%) fluctuations in the QW PL are not correlated with the presence of pits. The spectrum of the QW PL shows no significant variations on the length scales probed in this experiment. We thus find no spectroscopic signature of the recombination of strongly localized carriers at temperatures above 50 K. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120875
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  • 4
    Electronic Resource
    Electronic Resource
    Zero-dimensional excitonic confinement in locally strained Zn1−xCdxSe quantum wells (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 1213-1215 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the observation of zero-dimensional (0D) excitonic confinement in locally strained Zn1−xCdxSe quantum wells. Strain fields from self-organized CdSe quantum dots are used to locally modulate the band structure of a nearby quantum well in a heterostructure, resulting in confinement in all three dimensions. The 0D nature of excitonic confinement is verified by the observation of sharp lines in photoluminescence (PL) spectra. The temperature dependence of the PL lifetime is markedly different than that of the CdSe quantum dots. High-resolution spectra show that the PL lines from the localized states are split into linearly polarized doublets. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119854
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  • 5
    Electronic Resource
    Electronic Resource
    Magneto-optical spin spectroscopy in hybrid ferromagnetic semiconductor heterostructures : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5441-5443 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on magneto-optical measurements of diluted magnetic semiconductor quantum well structures in which an iron film is epitaxially grown and subsequently patterned on top of the heterostructure. The magnetic field due to the iron penetrates the quantum well near the edges of the patterned regions. Photoluminescence, Hanle effect, and time-resolved Faraday rotation measurements demonstrate that the films can be processed without significantly altering the electronic properties of the quantum well. The smallest length scale probed in these far-field optical measurements is of order 10 μm, so that no effects of the local magnetic fields at the film edges are observed for structures with 50-nm-thick ferromagnetic layers. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364564
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  • 6
    Electronic Resource
    Electronic Resource
    The onset of superfluidity in4He films adsorbed in aerogel glass (1992)
    Springer
    Journal of low temperature physics 89 (1992), S. 629-632 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have completed a systematic study of the superfluid density of 4 He films adsorbed in 91% porosity aerogel glass. We have concentrated on the low-coverage regime (Tc〈200 mK) in an attempt to address recent theoretical work on the onset of superfluidity in dirty boson systems. Our data are not in agreement with the predictions of a scaling theory of the onset transition developed by Fisher et al. 1 We discuss the extent of this disagreement and the limitations of other models of the onset transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694103
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