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  • 1
    Electronic Resource
    Electronic Resource
    Investigation of the Alkali-Metal Vanadium Oxide Xerogel Bronzes: AxV2O5.cntdot.nH2O (A = K and Cs) (1995)
    s.l. : American Chemical Society
    Chemistry of materials 7 (1995), S. 1616-1624 
    Details
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/cm00057a007
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  • 2
    Electronic Resource
    Electronic Resource
    The dispersion relation in antiparallel coupled ferromagnetic films : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6338-6340 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dispersion relation of the system with two identical magnetic layers antiparallel coupled is modified from the normal antiferromagnetic material as well as that of the single ferromagnetic layer. With the external field in the film plane parallel to the in-plane easy axis, three unique regions exist as the antiparallel, canted and saturation region. The resonance field of the acoustic mode shifts significantly compared with that of a noncoupled layer system if the magnetization is not saturated. No antiparallel state exists with the external field perpendicular to the film plane and a minimum frequency, ω=2γHE, is required to observe the acoustic resonance mode. In each orientation the optical mode exists at a field of 2HE higher than that of the acoustic mode in the saturation region. These calculations are very helpful to understand the unusual ferromagnetic resonance spectrum in the strong antiparallel coupled bilayer system being investigated in this lab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352641
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  • 3
    Electronic Resource
    Electronic Resource
    Finite size effects in thin NiMn spin glass layers : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6151-6153 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of the normalized spin freezing temperatures, Tf/Tbf, (Tbf=bulk spin-freezing temperature) are reported for NiMn/Cu multilayers in which the Mn concentrations are in the spin-glass range and the Cu thickness is held constant at a large enough value (tCu=30 nm) to magnetically decouple the NiMn layers. The variation of Tf/Tbf with NiMn layer thickness, tNiMr, is very similar to the variations previously found for CuMn, AgMn, and AuFe. Quasistatic finite size effects in NiMn spin-glass thus appear to be rather similar to those in the more traditional noble-metal spin glasses. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362055
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  • 4
    Electronic Resource
    Electronic Resource
    Comparison of the electron-spin-resonance linewidth in multilayered CuMn spin glasses with insulating versus conducting interlayers : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6489-6491 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature-dependent electron-spin-resonance linewidth ΔH(T) may be used to investigate the effect of the geometry and interlayer material on the magnetic properties of multilayered systems. We compare ΔH(T) in CuMn/Al2O3 multilayers with previous measurements of CuMn/Cu samples. CuMn/Al2O3 samples with CuMn thicknesses, WSG, from 40 A(ring) to 20 000 A(ring) obey the same form as the CuMn/Cu system, but show quantitative differences in the fitting parameters. The linewidths of the CuMn/Al2O3 samples, even in the bulk, are systematically larger than the linewidths for the CuMn/Cu samples, suggesting that the ESR linewidth is sensitive to differences in sample growth and structure. The value of the minimum linewidth decreases with decreasing WSG in the CuMn/Al2O3 series, but remains constant in the CuMn/Cu series. Although susceptibility measurements of the freezing temperature Tf do not differentiate between samples with WSG≥5000 A(ring), the ESR linewidth is sensitive to changes at larger length scales. This experiment emphasizes the importance of considering both the total sample thickness, as defined by the range of the conduction electrons, and the spin-glass layer thickness in analyzing the ESR linewidth in multilayers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356973
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic properties of Fe clusters in NaY zeolite : 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. 6567-6569 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Clusters of up to 28 Fe0 atoms have been introduced into the "supercages'' of NaY zeolite by ion exchange of Fe+2 for Na+ followed by reduction to Fe0 with solvated electrons and Na−1 ions. The temperature-dependent ac and dc susceptibilities, which exhibit Curie–Weiss behavior before reduction, change to something approximating superparamagnetic behavior afterwards. The blocking temperature, Tb shows a strong dependence on magnetic field but weak dependence on frequency. There is at best a very weak remanence and coercive field while the onset of irreversibility occurs at temperatures well above Tb. In addition, the real and imaginary parts of the ac susceptibility show essentially similar temperature dependence. Some of this anomalous behavior can be attributed to a distribution of particle sizes. To the best of our knowledge these preliminary data—while poorly understood—represent the first measurements of the temperature, frequency, and field dependence of the magnetic properties of such small clusters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358196
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  • 6
    Electronic Resource
    Electronic Resource
    Two- to three-dimensional recoupling in AgMn/Cu multilayers : 35th annual conference on magnetism and magnetic materials San Diego, California (USA) 29 Oct − 1 Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5054-5056 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The return from "quasi-two-dimensional'' to three-dimensional (3D) behavior of the spin-glass Ag0.91Mn0.09 is studied in multilayer samples of Ag-Mn layers of width 4 nm alternated with Cu interlayers of width 1 nm ≤ Wil ≤ 60 nm. For Wil (approximately-greater-than) 30 nm, the SG layers are magnetically decoupled; as Wil decreases below 30 nm, the quasistatic spin-freezing temperature Tf gradually rises toward the bulk spin-freezing temperature Tbf. When normalized to Tf/Tbf, the Ag-Mn data increase with decreasing Wil in a fashion similar to previous data for Cu-Mn. The data are compared with three different equations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348146
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  • 7
    Electronic Resource
    Electronic Resource
    The transition "back'' from two to three dimensions (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5970-5972 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The return from "quasi-two-dimensional'' to three-dimensional behavior of the spin-glass (SG) CuMn(13.5%) is studied in multilayer samples using pure Cu as an interlayer material. We measure how the quasi-static spin-freezing temperature Tf increases as the interlayer thickness Wil is decreased from 30 nm (2D) to 1 nm (3D), keeping the SG layer constant at WSG=4 nm. Alternative interpretations of this behavior have been used in terms of a simple mean-field RKKY model, the phenomenological scaling theory, and the Fisher and Huse droplet model of SG.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346031
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  • 8
    Electronic Resource
    Electronic Resource
    EuSe2: A novel antiferromagnetic rare-earth polychalcogenide (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5381-5383 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The reaction of Eu with a molten mixture of Li2Se and excess Se has produced a new rare earth dichalcogenide, EuSe2, with a type "a" antiferromagnetic structure. The compound crystallizes in the tetragonal space group I4/mcm forming into small single crystal rectangular blocks with their long axis along c. The high temperature magnetic susceptibility exhibits Curie–Weiss behavior with a ferromagnetic aitch-theta=15±1 K and an effective moment μeff=7.9±0.1 Bohr magnetons consistent with the theoretical value of 7.94 for the Eu2+ free ion. There is a peak in χc at Tn=8.0±0.5 K which is attributed to an antiferromagnetic transition. At T=2.5 K with the magnetic field, H, applied along c, M(H) exhibits a sharp increase near 1.5 T attributed to a metamagnetic transition. With H along a the moments saturate at about 5 T. A simple mean field model in which the Eu ions in the ab plane are coupled into ferromagnetic sheets, with alternate sheets along c coupled antiferromagnetically to form a bulk antiferromagnet is used to interpret the data. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369984
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  • 9
    Electronic Resource
    Electronic Resource
    Finite size effects in a metallic spin glass (invited) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5781-5784 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have observed finite size effects in thin films (20 A(ring)〈L〈1000 A(ring)) of CuMn with concentrations of 4%, 7%, and 13.5% Mn. In order to have measurable magnetization the samples are produced in the form of multilayers with silicon or copper interlayers. The interlayers are sufficiently thick (tSi =70 A(ring); tCu =300 A(ring)) so that there are no observable interactions between the CuMn layers. The samples are characterized structurally by low-angle x-ray diffraction, imaging, and x-ray fluorescence using a scanning transmission electron microscope. The metallic films are also characterized by measuring the electrical resistivity of both multilayer and single-layer CuMn samples. The temperature Tg of the peak in the dc susceptibility shifts with film thickness L as (T0g−Tg)/T0g∼L−λ for all concentrations and for both Si and Cu interlayers. The results for 4% Mn will be discussed in detail and compared with previously published data on 7% Mn.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342229
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetic phase transitions in nanocrystalline erbium (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3317-3319 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nanocrystalline samples of 99.9% pure erbium with particle sizes between 10 and 70 nm have been produced by the inert gas condensation technique. Magnetic susceptibility measurements on samples compacted to between 50% and 75% of bulk density indicate a modification in the high-temperature phases and superparamagnetic behavior at low temperatures. ESR signals near g=10 are probably due to Er compounds which may form during the production process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338894
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