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  • 1
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    Optical Data Storage : Phase-Change Media and Recording (2006)
    Dordrecht : Springer
    Details
    Keywords: Condensed matter ; Materials ; Optical materials ; Physical optics
    ISBN: 9781402042171
    URL: https://doi.org/10.1007/978-1-4020-4217-1
    Language: English
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  • 2
    Electronic Resource
    Electronic Resource
    Novel polycyclic heterocycles. Derivatives of 5,11-dihydrodibenz[b,e][1,4]oxazepine and 5,11-dihydrodibenzo[b,e][1,4]thiazepine (1970)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 13 (1970), S. 713-722 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00298a030
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  • 3
    Electronic Resource
    Electronic Resource
    Correlation length in La1−xCaxMnO3 (abstract) : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5487-5487 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Small-angle neutron scattering (SANS) has been used to measure the ferromagnetic correlation length in La0.67Ca0.33MnO3. This is of interest in these materials because the transport mechanism responsible for colossal magnetoresistivity involves valence fluctuation on the Mn sites, and thus, spin fluctuations. There should then be a direct relationship between the magnetoresistivity and the spin–fluctuation correlation length. The magnetic SANS was determined by substracting 15 K data from the data at and above TC (250 K). When the quasistatic approximation is valid, the magnetic SANS measures the static equal-time two-spin correlation function. In an ideal isotropic ferromagnet, the fluctuations that drive the phase transition are the transverse (below TC) spin waves, which have a divergent correlation length at and below TC. Our measurements show that the magnetic scattering function for temperatures above TC is approximately Lorentzian. However, the extracted correlation length is anomalously small, starting at about 6 Å at 400 K and increasing only to about 11 Å at the nominal TC=250 K. The correlation length continues to increase below TC to about 14 Å at 225 K. Inelastic scattering measurements suggest that there are significant diffusive fluctuations near TC in addition to the spin waves. We are performing SANS measurements in a magnetic field to try to separate the correlation lengths of these two types of fluctuations. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364574
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  • 4
    Electronic Resource
    Electronic Resource
    Nature of the interlayer coupling in annealed Ni80Fe20/Ag multilayers : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4762-4765 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using x-ray and polarized neutron (PNR) reflectivity, we have measured the structural and magnetic depth profiles of annealed Ni80Fe20 (20 A(ring))/Ag (40 A(ring)) multilayers. The x-ray data indicate that the interfaces are highly mixed. PNR measurements of the 335 °C annealed multilayer in small magnetic fields reveal a broad feature in the off-specular spin-flip scattering that is not present for the unannealed sample. The giant magnetoresistance is thus associated with antiferromagnetic correlations between micrometer-sized magnetic domains within the Ni80Fe20 layers. This spin ordering is consistent with a model in which weak dipolar forces lead to an antiparallel alignment of the domains across the Ag layers. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361664
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  • 5
    Electronic Resource
    Electronic Resource
    Investigations of the interplay between crystalline and magnetic ordering in Fe3O4/NiO superlattices : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6284-6286 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using SQUID magnetometry and both x-ray- and neutron-diffraction techniques, we have studied the structural and magnetic ordering of a series of Fe3O4/NiO superlattices grown by MBE. X-ray diffraction reveals that the superlattices are coherent, single phase crystals with narrow interfaces. Symmetry differences between the Fe3O4 spinel and NiO rocksalt structures lead to interfacial stacking faults, manifested in some diffraction intensities. Analysis of the neutron-diffraction spectra show that the NiO antiferromagnetic ordering is coherent through several superlattice bilayers, while the Fe3O4 magnetic ordering is confined to individual interlayers by stacking faults in all superlattices but those with thinnest (≤10 A(ring)) NiO interlayers. Neutron diffraction and SQUID magnetometry have been used to study the Fe3O4 Verwey phase transition in thin-layered superlattices. The charge ordering in superlattices such as [Fe3O4 (75 A(ring))||NiO (9 A(ring))]500, below the Verwey transition, directly observable in (4, 0, 1/2) neutron intensities, indicates a shift to higher temperature of the charge ordering transition from the bulk Fe3O4 TVerwey at 123 K. We also describe ongoing efforts to extract the moment distribution in these superlattices from field dependent high-angle neutron diffraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358306
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  • 6
    Electronic Resource
    Electronic Resource
    Vortex structures in YBa2Cu3O7 (invited) : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6778-6783 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Extensive small angle neutron scattering experiments have been conducted on the vortex system in YBa2Cu3O7 in a magnetic field range of 0.5 T≤H≤5 T, and with various orientations of the magnetic field with respect to the crystallographic axes. For H parallel to the c axis, the vortex lattice is oblique with two nearly equal lattice constants and an angle of 73° between primitive vectors. One principal axis of the vortex lattice coincides with the (110) direction of the crystal lattice. It is shown that this structure cannot be explained in the framework of a purely electrodynamic (London) model, and that it is intimately related to the in-plane anisotropy of the superconducting coherence length. When the field is inclined with respect to the c axis, the uniaxial anisotropy due to the layered crystal structure of YBa2Cu3O7 becomes relevant. The interplay between the square in-plane anisotropy and the uniaxial anisotropy leads to both a continous structural transition and a reorientation of the vortex lattice as a function of inclination angle. For the largest inclination angles, the vortex lattice decomposes into independent chains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358531
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  • 7
    Electronic Resource
    Electronic Resource
    Studies of the Verwey transition in Fe3O4/NiO superlattices by SQUID magnetometry and neutron diffraction techniques (abstract) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6691-6691 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single crystal superlattices of Fe3O4 and NiO, grown on MgO(100), provide a means to study the competition between interfacial exchange coupling effects and epitaxial strain induced by these closely, but not perfectly, lattice matched materials. Both induce profound macroscopic magnetic effects in the superlattices, especially for films with very thin (〈80 A(ring)) modulation thicknesses. The Fe3O4 Verwey conductivity transition in the bulk (∼120 K) is highly sensitive to both the exact stoichiometry of the iron oxide and the presence of strain and is accompanied by a structural and magnetic anisotropy change. X-ray diffraction measurements show that these superlattices are tetragonally distorted (up to 1%), with the increased strain associated with superlattices composed of thin bilayers. By tracking the magnetic evidence of this phase transition using SQUID magnetometry techniques, we observe attenuation of the effect in superlattice films as the iron oxide layers grow thinner and the nickel oxide layers are thickened, which suggests that the presence of strain in the iron oxide layers is highly important. The small structural distortion is observable in neutron diffraction measurements of a Fe3O4 film. Studies of the diffuse and critical scattering associated with this transition in strained iron oxide films and Fe3O4/NiO superlattices and a comparison to previous work on bulk Fe3O4 single crystals will be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356897
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  • 8
    Electronic Resource
    Electronic Resource
    Domain structure in NiO biasing layers (abstract) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5102-5102 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fe3O4/NiO multilayers exhibit long-range antiferromagnetic order with the magnetite ferrimagnetic correlations confined to a single layer due to stacking faults of the spinel structure at the interfaces. We are studying the field dependence of the interlayer coupling and magnetic structure in a series of Fe3O4/NiO multilayers using neutron diffraction. Both NiO and Fe3O4 thin films were included in the measurements for comparison. In a single thick Fe3O4 film, intensity changes with magnetic field are consistent with the alignment of the net ferrimagnetic moment parallel to the applied field. In a single thick NiO film, we observe no intensity changes with magnetic field. For multilayers where the ratio of NiO to Fe3O4 is far from unity, the field dependence approximates that of the thick film of the majority constituent. However, for a Fe3O4 (68 A(ring))/NiO (34 A(ring)) multilayer the NiO antiferromagnetic intensity decreases with increasing field, applied parallel to a [110] axis in the film plane. This indicates a domain repopulation in the NiO, concomitant with the magnetization of the magnetite, where the antiferromagnetic modulation direction prefers the [111] axes that are closest to the applied field direction. A broadening of the NiO peak shows that the repopulated domains are smaller. We are pursuing a complete measurement of the domain populations by measuring a series of NiO antiferromagnetic diffraction peaks. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361314
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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Magnetic structure determination for Fe3O4/NiO superlattices by neutron diffraction techniques (abstract) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6692-6692 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Neutron diffraction measurements reveal the nature of the magnetic structure in Fe3O4/NiO superlattices grown by molecular beam epitaxy. By taking advantage of differences between the spinel and rocksalt crystalline symmetries, we have separated the magnetic order parameters of the Fe3O4 and NiO bilayer components. The NiO antiferromagnetic order develops at temperatures 10–150 K greater than TNéel for bulk (520 K) due to exchange coupling of the Ni spins to the Fe3O4 (TCurie=858 K) at the superlattice interfaces. The resultant scaling of the NiO transition temperature with the bilayer composition is consistent with expectations from mean-field treatments for a modulated magnetic material. In addition, the NiO spin order propagates coherently through several superlattice bilayers, while the magnetic coherence of the Fe3O4 is limited by a random stacking of the spinel unit cell at the interfaces when the NiO interlayers are thicker than ≈15 A(ring). A model for the diffraction data, based upon a Hendricks–Teller description of the interfacial disorder, demonstrates that the observed broadening of selected crystalline and magnetic reflections originates directly from these stacking faults. Combining the high angle diffraction results with those from polarized-beam reflectivity analysis, we extract specific information about the moment distribution in these superlattices and qualitatively explain the evolution of the magnetic structure with temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356867
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