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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic structure in Dy/Sc superlattices : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6904-6906 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated magnetic order in superlattices of Dy and Sc grown along the hcp c axis by molecular beam epitaxy (MBE) techniques. Our neutron diffraction experiments reveal that individual Dy layers order ferromagnetically below Tc∼150 K. The magnetic coherence length along the growth direction is less than the Dy-layer thickness. Previous studies of rare-earth superlattices with Y or Lu as spacer layers have shown that magnetic coherence propagates through sufficiently thin nonmagnetic interlayers. This arises from the long-range exchange interaction that originates from nesting features in the Fermi surface of the spacer material. The lack of coupling in Dy/Sc superlattices reflects the very different Fermi surface of Sc, with much weaker nesting than Y and Lu.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352429
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  • 2
    Electronic Resource
    Electronic Resource
    Temperature dependence of magnetic anisotropy of La0.8Ca0.2MnO3 epitaxial thin films (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6764-6766 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic anisotropy of epitaxial La0.8Ca0.2MnO3(LCMO) thin films grown by pulsed laser deposition has been studied as a function of temperature and lattice strain. Pseudomorphic growth on (001) SrTiO3 substrates imposes an in-plane tensile stress on the LCMO films, which produces an easy-plane magnetic anisotropy in the growth plane, accompanied by a weak biaxial anisotropy in the easy plane. In contrast growth on (001) LaAlO3 substrates produces an in-plane compressive stress, which leads to an out-of-plane uniaxial easy axis. The observed behavior indicates the presence of a positive magnetostriction, and that the anisotropy energy is dominated by the epitaxial strain induced effects. Uniaxial magnetic anisotropy constants of 250 and 500 Å LCMO films have been determined by fitting the magnetization curves for temperatures between 5 and 200 K, and magnetostriction constants have been estimated subsequently. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372834
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic properties of Dy-Lu alloys : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6592-6594 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Although many binary heavy rare-earth alloy systems have been studied extensively, there has been little work reported on the Dy-Lu system. The properties of single-crystal DyxLu1−x films grown by molecular beam epitaxy are reported. SQUID magnetometer and neutron diffraction measurements on samples with x=0.4, 0.5, and 0.6 show that the samples order helimagnetically with Néel temperatures of TN=90, 105, and 120 K, respectively. The helical turn angle was mapped as a function of temperature for each of the three alloys. Magnetic x-ray scattering, the first in an alloy, was observed at the (002)± positions at 15 and 60 K in the x=0.4 sample using resonant exchange scattering of synchrotron radiation at the Dy LIII edge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356905
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic properties of DyAs and DyP (001) films (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4970-4972 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of two single crystal (001) films of DyP and DyAs have been investigated at temperatures between 2 and 300 K and at fields up to 5 T using SQUID magnetometry. The films were grown epitaxially in the simple NaCl structure on (001) GaAs substrates using molecular beam epitaxy techniques. The phosphide compound exhibits ferromagnetic-like order below ∼9 K. The ordered phase appears to have 90° spin alignments, a suppressed saturation moment (∼1.0μB), and a large magnetic anisotropy. In contrast, the arsenide develops an antiferromagnetic-like correlation below ∼6 K, with a much lower anisotropy and a higher moment (∼2.8μB) than that of the phosphide. Above the ordering transitions, the two samples exhibit paramagnetism with paramagnetic moments of 4.5 and 7.8μB for the DyP and the DyAs sample, respectively. The observed behavior is consistent with the presence of strong crystal field interactions. Experiments have been proposed to further explore these effects. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370061
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  • 5
    Electronic Resource
    Electronic Resource
    Smoothening transition during initial epitaxial growth of Mo on sapphire (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 3796-3798 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The initial epitaxial growth of Mo (111) on Al2O3 (0001) substrates has been studied systematically as a function of growth temperature and rate, using real-time reflection high energy electron diffraction (RHEED) and in situ scanning probe microscopy. The evolution of RHEED specular intensity during Mo growth exhibits a distinct peak at Mo coverage of ∼10 Å, where the Mo surface is the smoothest. The observed Mo coverage at the specular peak is independent of growth temperature and rate, indicating that it is energetically stable. However, our findings reveal that surface kinetics plays a key role in determining the observed behavior. At each growth temperature, the highest specular intensity occurs at an optimum growth rate, at which the Mo surface is the smoothest. The temperature dependence of the optimum rate has an Arrhenius form indicating that the observed behavior is an activated process. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125459
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  • 6
    Electronic Resource
    Electronic Resource
    Anisotropic magnetic susceptibility of multiwalled carbon nanotubes (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 1452-1454 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic susceptibility of partially aligned multiwalled carbon nanotubes has been studied using superconducting quantum interference device magnetometry. Partial alignment of multiwalled nanotubes was produced by uniaxially straining composites of carbon nanotubes embedded in polymer matrices. The degree of alignment was determined by x-ray diffraction. The observed magnetic response is diamagnetic and anisotropic with the component along the nanotubes less diamagnetic than that of the perpendicular. The observed anisotropy is consistent with theoretical predictions, but it contradicts earlier experimental findings. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.126061
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  • 7
    Electronic Resource
    Electronic Resource
    Strain-dependent magnetic phase diagram of epitaxial La0.67Sr0.33MnO3 thin films (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 2421-2423 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Effects of lattice strain on magnetic behavior of epitaxial La0.67Sr0.33MnO3 thin films grown by 90° off-axis sputtering have been studied. The size of epitaxial strain was varied using four different substrates, i.e., (001) LaAlO3, (001) SrTiO3, (001) La0.3Sr0.7Al0.65Ta0.35O9, and (110) NdGaO3. The observed magnetism of coherent epitaxial films grown on these substrates, particularly anisotropy and Curie temperature, exhibit strong correlations with lattice strains. Spin reorientation transitions have been observed. The dependence of Curie temperature on the bulk and Jahn–Teller strains has been determined. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.126363
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  • 8
    Electronic Resource
    Electronic Resource
    Anisotropy of RKKY coupling strength in Dy/Y superlattices (abstract) (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5733-5733 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated the dependence of magnetic coupling strength on growth direction in superlattices made from alternating layers of Dy and Y metals. Using new molecular-beam epitaxy techniques, we have succeeded in growing high-quality single-crystal materials with structural coherence lengths 〉500 A(ring) and with the growth direction oriented along a, b, or c crystallographic axes by choice. In earlier work, we showed that, in c-axis samples, Dy layers order coherently via RKKY-like interactions propagated through Y layers up to about 150 A(ring) thick. Here we report neutron scattering data which show that Dy layers in b-axis samples fail to couple coherently even when the Y spacer layers are as thin as 26 A(ring). This observation can be explained in a semiquantitative way in terms of the anisotropy of the q-dependent susceptibility of Y, which exhibits a peak that is sharp in the c* direction but broad along a* and b*. As a result, the conduction-electron mediated exchange coupling through the Y layer is long ranged along c but short ranged along a and b. An interesting anisotropy of the magnetic coherence in b-axis samples is also observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345946
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  • 9
    Electronic Resource
    Electronic Resource
    Layer thickness dependence of anisotropic coupling in Gd/Y superlattices
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 104-107 (1992), S. 1901-1902 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(92)91596-L
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  • 10
    Electronic Resource
    Electronic Resource
    Mass-spectral studies of isometric d-ribofuranosylribitol disaccharides from the capsular polysaccharides of Haemophilus influenzae type b and Escherichia coli K 100
    Amsterdam : Elsevier
    Carbohydrate Research 73 (1979), S. 59-65 
    Details
    ISSN: 0008-6215
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0008-6215(00)85474-9
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