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  • 1
    Monograph available for loan
    Monograph available for loan
    Structural and magnetic phase transitions in minerals (1988)
    New York [u.a.] : Springer
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    Call number: FHD 456
    In: Advances in physical geochemistry
    Type of Medium: Monograph available for loan
    Pages: xii, 244 S.
    ISBN: 0387967109
    Series Statement: Advances in physical geochemistry 7
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Ferromagnetic films of MnSb prepared by laser ablation deposition (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6845-6845 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: MnSb films prepared by pulsed deposition from stoichiometric MnSb cold-pressed targets were characterized by x-ray diffraction, scanning electron microscopy, scanning tunnelling microscopy, vibrating sample magnetometry, and transverse magneto-optic Kerr effect measurements. Films deposited on glass or quartz below 400 °C show preferential orientation with the (110) plane parallel to the surface of the film. They show an increased lattice constant a which is likely to be due to manganese deficiency. Square in-plane hysteresis loops were observed with a coercivity of 8 mT. The reflectivity change at saturation is 1.4%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352457
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  • 3
    Electronic Resource
    Electronic Resource
    Charge freezing and surface anisotropy on magnetite (100) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6742-6744 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Scanning tunneling microscope images of the (100) surface of slightly nonstoichiometric magnetite taken at room temperature show static arrays of pairs of Fe2+ ions with short-range order, and a charge fluctuation time greater than 103 s. The surface appears to be a Wigner glass with electron pairs localized on adjacent ions as the basic unit. The explanation of Wigner localization at room temperature on the surface only is that the spin-polarized minority-spin band derived from dyz orbitals is stabilized and narrowed by the absence of an apicial oxygen from the B-site octahedron. This leads to surface anisotropy where the Fe2+ spins are pinned normal to the {100} surfaces. Surface anisotropy is expected to outweigh bulk anisotropy in submicron particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352522
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  • 4
    Electronic Resource
    Electronic Resource
    Interstitial modification of rare-earth intermetallics : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6940-6942 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Interstitial modification of R2Fe17Zx is studied with R=Y, Sm, and Z=N, C, B, Si, and S. Equilibrium interstitial concentrations are calculated using a lattice gas model. For gas–solid reaction a low solubility is obtained at high temperatures, whereas a solid–solid reaction is predicted to yield R2Fe17Z1.5 in the high-temperature limit. Theoretical results are compared with data on Sm2Fe17Cx produced by solid–solid reaction at 500 °C. Volume expansions up to 4.8% were obtained, which corresponds to x(approximately-equal-to)2. The concentrations of interstitial boron and silicon are much lower.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352441
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic properties of a new family of ternary rare-earth iron nitrides R2Fe17N3−δ (invited) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5584-5589 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of interstitial ternary nitrides R2Fe17N3−δ has been prepared via a gas-solid reaction for R=Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Lu, and Y. These nitrides have structures related to the Th2Zn17 or Th2Ni17 structures of the R2Fe17 parent compounds, but the unit cell volumes are 6%–7% greater, and the Curie temperatures are approximately 400 K higher. The Fe-Fe exchange interactions are increased by a factor of 2.8 by nitrogenation, whereas the R-Fe exchange interactions are little changed. All compounds exhibit easy-plane anisotropy at room temperature, except for Sm2Fe17N3−δ, which shows strong uniaxial anisotropy and may be used to make permanent magnets. The Er and Tm compounds exhibit spin reorientations below room temperature. The anisotropy due to the iron sublattices is easy plane (K1 = −1.3 MJ/m3 at 4.2 K for Y2Fe17N3), but it changes sign to easy axis with cobalt substitution (K1 ≈ 1.0 MJ/m3 at 4.2 K for Y2(Fe1−xCox)17N3−δ when x≥0.2).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347957
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  • 6
    Electronic Resource
    Electronic Resource
    Structural chemistry, magnetism and 119Sn Mössbauer spectroscopy of ternary compounds REMn6Sn6 (RE=Pr,Nd,Sm) (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 8447-8450 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ternary compounds (Pr,Nd,Sm)Mn6Sn6 have been synthesized by argon arc melting starting from the pure elements. All compounds were found to be isotypic with HoFe6Sn6 (space group Immm-D2h25, no. 71; Z=6). The HoFe6Sn6 type is a stacking variant composed of slabs of the HfFe6Ge6 type and of the ScFe6Ga6 type. The compounds order ferrimagnetically slightly above room temperature exhibiting a strong magnetocrystalline anisotropy. The 119Sn Mössbauer spectra at 15 and 293 K were fitted with five magnetic sextets, with hyperfine fields ranging from 12 to 32 T at 15 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353416
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  • 7
    Electronic Resource
    Electronic Resource
    Nitrogen diffusion in Sm2Fe17 and local elastic and magnetic properties (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 7602-7611 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The reaction between nitrogen gas and an intermetallic compound is studied, with particular reference to Sm2Fe17 , treating the Sm2Fe17Ny system as a gas-solid solution. A simple lattice gas model is used to describe the reaction of nitrogen atoms with the metal lattice in terms of the net reaction energy U0=−57±5 kJ/mol. The equilibrium nitrogen concentration is calculated as a function of nitrogenation temperature and gas pressure. Refined diffusion parameters D0=1.02 mm2/s and Ea=133 kJ/mol, determined by thermopiezic analysis of the initial stage of nitrogen absorption, are used to calculate nitrogen profiles and the time dependence of the mean nitrogen content during nitrogenation. Assuming mechanically isotropic grains the elastic strain and stress profiles are calculated. Main results are a large uniaxial strain near the surface of nonuniformly nitrided particles, and core expansion even in the absence of any nitrogen there. Curie temperature and K1 profiles are calculated and suggestions are made regarding the influence of stress on coercivity and disproportionation of the material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353981
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  • 8
    Electronic Resource
    Electronic Resource
    Characterization, transport, and magnetic properties of Co/Pd multilayers produced by pulsed laser deposition : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6421-6423 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Metallic Co/Pd multilayers with equal layer thickness and periods ranging from 5 to 150 A(ring) were deposited using pulsed laser deposition. They have an fcc (111) texture and the diffraction patterns give clear evidence of a modulated period structure. From the period dependence of the in-plane electrical resistivity a diffuse interface between cobalt and palladium of thickness b=6±2 A(ring) has been deduced. Magnetic, magnetoresistance, and Kerr-effect measurements indicate in-plane magnetization. In low fields (B0≤10 mT) the magnetoresistance is highly anisotropic, varying by −2% in the transverse configuration and +1% in the longitudinal configuration due to orbital moment of cobalt in the interface region. The shape of the Kerr-effect major hysteresis loop can be explained by the in-plane component of the anisotropy of the cobalt layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352619
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  • 9
    Electronic Resource
    Electronic Resource
    Nitrogenation of R2Fe17 compounds: R=rare earth (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 3007-3010 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The reaction between nitrogen gas and the series of R2Fe17 intermetallic compounds is studied by thermopiezic analysis on micron-size powders. Nitrogen diffusion in the range 300–550 °C can be represented by an activated interstitial diffusion process D=D0e−Em/kT with D0=1.95×10−10 m2 s−1 and an activation energy Em=0.81 eV. This stage of the nitrogenation reaction leads to the formation of R2Fe17N3−δ nitrides which have structures related to those of the parent compounds. Heating above about 800 °C leads to complete disproportionation of the compounds into a mixture of rare-earth nitride and iron.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348614
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  • 10
    Electronic Resource
    Electronic Resource
    Relationship between ThMn12 and Th2Ni17 structure types in the YFe11−xTix alloy series (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4838-4840 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of YFe11−xTix alloys with x=0.10, 0.25, 0.40, 0.50, 0.70, 1.00, 1.25, 1.50, and 2.00 have been investigated using x-ray diffraction, thermomagnetic analysis, the singular point detection technique, and 57Fe Mössbauer spectroscopy. A pure ThMn12 -type phase was observed when 0.7≤x≤1.25. It has Curie temperature of 524 K, anisotropy field of 2.3 T, and average iron magnetic moment of 1.47 μB at room temperature. The relationship between the CaCu5 and the Th2Ni17 or ThMn12 structure types is discussed in terms of substitution of transition-metal dumbbells on Ca sites, and a structural explanation is given for the directions of the iron anisotropy in the 2:17 and 1:12 compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344753
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