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  • 1
    Electronic Resource
    Electronic Resource
    Structure and magnetic properties of Co(Zr, B)/Cu multilayers : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5304-5306 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Sputtered Co, CoB and CoZrB alloys in thin-film and multilayer form have been prepared using Cu as a spacer. All of the multilayers show a weak contribution to the magnetic anisotropy from the interface which favors perpendicular magnetic anisotropy and a strong contribution from the bulk which favors in-plane anisotropy. All the multilayers also show a stronger coercivity perpendicular to the film than in the plane of the film. The coercivity perpendicular to the film shows a dependence on magnetic layer thickness with the coercivity decreasing with decreasing thickness and this is discussed in terms of the magnetic domain size which is restricted by the magnetic layer thickness. CoZrB/Cu multilayers show the smallest coercivity of the above multilayer systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348057
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  • 2
    Electronic Resource
    Electronic Resource
    Dependence of interface anisotropy on rare earth in R/Mo (R=Dy,Er) multilayers : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6212-6214 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the magnetic properties of Er/Mo multilayers and compare to our earlier work on Dy80Ni20/Mo multilayers. The magnetic order in these multilayers is not collinear and most likely is speromagnetic, much like a spin glass. Magnetic fields as high as 55 kOe do not saturate the magnetization. Both the interface anisotropy Ks and the bulk anisotropy are determined. We find a qualitative correlation between Ks and the single ion anisotropy (calculated from the bulk anisotropy) with Dy multilayers where the single ion anisotropy is larger having a larger value of Ks than Er multilayers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349998
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic properties and structure of DyNi/Mo multilayers : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5292-5294 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Dy80Ni20/Mo multilayers have been prepared by sputtering and the effects of the interface on the magnetic anisotropy of these materials are reported. A large interface anisotropy is found but it is somewhat smaller than that estimated from a point-charge model assuming a sharp interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348053
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  • 4
    Electronic Resource
    Electronic Resource
    Attempts to prepare Bi-based superconductors on a carbon fiber substrate (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5023-5025 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied the properties of thin films prepared by laser ablation of a Bi2Sr2CaCu2O8−δ target on carbon fiber substrates. Excimer laser radiation was used to prepare the films. Films were deposited on polyacrylonitrile-based carbon fibers. X-ray photoelectron spectroscopy (XPS) was used to detect the presence of the elements in the film. The structure of the film was studied using x-ray diffraction (XRD). Resistance measurements indicated that the films were not superconducting down to 4.5 K, but the XPS and XRD data showed that films could be formed on the fibers. We find evidence of oxidation of the carbon fiber surface by the superconductor material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344711
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  • 5
    Electronic Resource
    Electronic Resource
    Coercitivity and its temperature dependence in NdFeB thin films with Cr, Mo, Ti, or Ta buffer layers (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6131-6133 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: NdFeB thin films of the form A(20 nm)/NdFeB(d nm)/A(20 nm) were prepared by magnetron sputtering on a Si(100) substrate. The hard Nd2Fe14B phase is formed by a postanneal in vacuum. The buffer layers A used are Cr, Mo, Ta, Ti, and NdFeB layer thickness used are 540, 180, 90, and 54 nm. We have found several different combinations of anneal temperature, buffer layer, and NdFeB film thickness d that lead to large coercivity, as high as 17.0 kOe, and energy product, as high as 10.3 MG Oe. The temperature dependence of coercivity was analyzed using a modified Brown's equation and we find that the microstructural parameter αK and the effective demagnetization factor Ne change with the buffer material and anneal temperature. Possible magnetic reversal mechanisms are discussed in light of these results. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372632
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic properties of thin film and granular Dy50Fe50 as a function of size (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6137-6139 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin amorphous Dy50Fe50/A layers are prepared by sputtering to understand the influence of the spacer layer A on magnetic properties in the DyFe thickness regime where size effects are also important. The spacer layer A in this work is either Ti or Ca and we compare to our earlier work involving a spacer layer of Mo. The Dy50Fe50 layer is amorphous and Mössbauer spectroscopy indicates that two types of Fe site are present. Finite size effects manifest themselves below a size of 10 nm in a reduction of magnetic ordering temperature TC and coercivity HC. For equal values of d, the reduction of TC and HC is larger for the system with a Ti or Mo spacer layer as compared to the Ca spacer layer. We argue that both size and the structure of the interface are important in lowering HC and TC. The temperature dependence of coercivity is also studied and suggests that magnetic reversal via domain wall movement occurs in our thinnest films. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372634
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of nanostructure (layers and particles) on the magnetism of rare-earth materials (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4322-4324 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Elemental rare-earths R (Gd, Dy, Tb) are prepared in layer and particle form to look at the effects of geometry (layers or particles) and size (layer thickness or particle diameter) on their magnetism. All of the rare-earth systems show a maximum in coercivity (measured at 4.5 K) at about 10 nm (average particle diameter or layer thickness). Magnetic ordering temperature is reduced significantly compared to the bulk when size is reduced below 10 nm for both the layer and the particle geometry. Geometry has a significant effect on the maximum coercivity with particles tending to have larger coercivity than layers. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370356
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  • 8
    Electronic Resource
    Electronic Resource
    Evidence for quantum mesoscopic tunneling in rare-earth layers : The 6th joint magnetism and magnetic materials (MMM)−intermag conferenc (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6174-6176 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on finite size effects and evidence for quantum mesoscopic tunneling (QMT) in thin isolated rare-earth layers prepared in the form of R/Mo multilayers where R represents Tb, Dy, or Dy50Co50. The magnetic transition temperature Tc decreases with decreasing magnetic layer thickness and is discussed within a finite size scaling theory. Evidence for QMT is found in magnetic relaxation measurements in these systems with a sharp crossover to a temperature-independent magnetic relaxation regime at low temperatures. The Tb system has a crossover temperature T0 of 20 K, the largest value reported so far for this crossover.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358343
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetism of thin magnetic layers with strong anisotropy and quantum tunneling (abstract) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5643-5643 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the magnetic properties of Dy(t A(ring))/Mo(d A(ring)), DyCo(t A(ring))/Mo(d A(ring)), and Gd(t A(ring))/Mo(d A(ring)) multilayers where d=180 A(ring) and t ranges from 10 to 3000 A(ring). We find a decrease in Tc with decreasing t, with the most rapid decrease occurring for the Gd system where the anisotropy is the weakest. We have looked at the time dependence of magnetization in the anisotropic systems (Dy based). At long times (5×104 s) the magnetization shows a stretched exponential dependence on time as is found in other magnetically disordered systems. We have also looked at the rate of magnetic relaxation at short times (〈1000 s) and find that it becomes independent of temperature below a temperature in the range 3–6 K depending on the magnetic layer thickness t. We shall consider the possibility of macroscopic quantum tunneling here and estimate the temperature, T*, below which a system is expected to cross over from thermally activated to quantum tunneling.1,2 We shall also compare our results to previous work on Dy/Cu.3
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355622
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  • 10
    Electronic Resource
    Electronic Resource
    Inverted hysteresis in magnetic systems with interface exchange : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6673-6675 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of interface exchange on magnetic hysteresis are considered for a variety of situations in a two-phase model in which the phases are coupled antiferromagnetically. This work is motivated by studies of Co-CoO nanophase systems where inverted hysteresis loops, a phenomenon closely related to shifted hysteresis loops, are obtained. Some previous examples of systems with inverted hysteresis loops are reviewed and a two-phase model with uniaxial anisotropy and interface exchange is considered. It should be emphasized that this model cannot completely explain inverted hysteresis loops, but it does show that partially inverted loops can be obtained. Cases where H is not along an anisotropy axis are discussed; it was concluded that some alignment of H with the axis of the stronger anisotropy phase is necessary to obtain partially inverted hysteresis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356891
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