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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
    The magnetization of bulk α‘Fe16N2 (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. 6632-6636 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Evidence for giant magnetic moments in the metastable nitride α‘Fe16N2 is reviewed, with reference to the related stable nitride γ'Fe4N and αFe. It is concluded from a survey of electronic structure calculations, Mössbauer spectra, and magnetization measurements on bulk multiphase samples that the average iron moment in α‘Fe16N2 at T∼0 lies in the range 2.3–2.6 μB. A significantly larger moment of about 2.9 μB appears on the 4d sites which have no nitrogen neighbors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358156
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  • 3
    Electronic Resource
    Electronic Resource
    Transport properties of (Sm0.7A0.3)MnO3 (A=Ca2+,Sr2+,Ba2+,Pb2+) : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5763-5765 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Polycrystalline samples of the mixed-valence perovskite-type manganites (Sm0.7A0.3)MnO3 (A=Ca2+,Sr2+,Ba2+,Pb2+) have been synthesized and their transport properties studied. The electrical conductivity of the series involves a variable-range hopping mechanism in the paramagnetic state, which extends well below TC for three of the samples. Only (Sm0.7Sr0.3)MnO3 shows a metal-insulator transition. There is a peak in the resistivity at a temperature Tp, just below the Curie point, TC=70 K with a transition from thermally activated type to metallic conductivity at low temperature with a large residual resistivity, ρ0=6×10−4 Ω m. By comparison with the (Ln0.7A0.3)MnO3 compounds, Ln=La, Pr, Nd the samarium compounds are more localized. The decrease of both Tp and TC with decreasing lanthanide radius and increasing mass depends on the nature of the substituted divalent cation, but the data cannot be scaled on a universal curve with respect to average ionic radius or tolerance factor. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364719
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  • 4
    Electronic Resource
    Electronic Resource
    Investigation into the magnetic properties of Zn1−xMnxTe thin films by the Faraday effect (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 799-805 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An investigation of the concentration and temperature dependent Faraday rotation is performed in a series of Zn1−xMnxTe thin films produced by pulsed laser deposition. The films were deposited on (0001) sapphire substrates, and had Mn fractions in the range 0.08≤x≤0.84. An analytical expression for the peak rotation θFp near the band edge, was derived using a single oscillator model for the refractive index at the energy of the ground state free exciton, and it was shown that θFp is directly related to the sample magnetization in the high field limit of several Tesla. However, even at the moderate field strength of 0.4 T, used in the present work, the expression still approximately models the band edge Faraday rotation, and θFp can still be usefully employed as a probe of the magnetic properties of the films. By examining the variation in θFp with Mn concentration, it was seen that a roughly linear decrease occurred with increasing x, and this was assumed to be due to the formation of antiferromagnetic clusters of Mn2+ ions. Temperature dependent studies of (θFp)−1 for films with x=0.08 and x=0.55 revealed a linear Curie–Weiss behavior down to low temperatures, before exhibiting a characteristic downturn caused by uncoupled spins which contribute noticeably to the magnetic susceptibility in this temperature regime. Spin freezing was also observed from a cusp-like behavior in θFp, for films with x=0.55 and x=0.63. The temperature of the spin freezing agreed very well with its expected position based on the available magnetic phase diagram for Zn1−xMnxTe. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365553
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of nitrogen content on coercivity in remanence-enhanced mechanically alloyed Sm-Fe-N : 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. 7068-7070 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In nanostructured Sm2Fe17Nx+α-Fe two-phase permanent magnets, exchange interactions between hard and soft magnetic phases result in remanence enhancement. With a starting composition of Sm7Fe93, mechanical alloying, annealing at 625 °C for 10 min and subsequent nitriding at 330 °C for 45 h results in hard magnetic powder with nanocrystallites of Sm2Fe17N3 and α-Fe some 20 nm in size. There is a coercivity of μ0Hc=0.4 T and a remanence Jr=1.2 T, after saturating in a field of 7.5 T. The deduced value of the remanence depends strongly on the choice of demagnetizing factor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358029
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  • 6
    Electronic Resource
    Electronic Resource
    57Fe Mössbauer studies of Nd(Fe12−xMox) and Nd(Fe12−xMox)N0.9 (x=1.25 and 1.50) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6235-6237 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nd(Fe12−xMox)Ny (x=1.25 and 1.50, y=0.9) 57Fe Mössbauer spectra of parent compounds and nitrides have been measured at 15 and 293 K. Hyperfine fields are little changed by the presence of nitrogen at 15 K, where the average value is about 25 T but at 293 K there is a change in average hyperfine field from 19 T for parent compounds to 24 T for nitrides due to the increase in Curie temperature. Spin reorientations occur in the parent compounds in the temperature range between 160–190 K but not in the nitrides, which show c-axis anisotropy throughout this range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355409
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  • 7
    Electronic Resource
    Electronic Resource
    Susceptibility and magnetization processes in Sm2Fe17N3 powders (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 6385-6390 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low field ac susceptibility and magnetization curves of milled Sm2Fe17N3 powders are measured for isotropic and aligned samples with average particle sizes ranging from 3.0 to 52 μm. Most of the particles are in a multidomain state before application of a magnetic field. The transverse ac susceptibility (χ⊥ac∼0.08) due to magnetization rotation against the anisotropy field is independent of particle size. The parallel ac susceptibility χ(parallel)ac and the susceptibility of isotropic powders are dominated by almost free domain wall movement in multidomain particles for which 〈χ〉=1.35. In very low fields (〈0.5 mT) χ(parallel)ac is small (∼0.1), but it increases toward a constant value of order 1 when the field exceeds a value of order 1 mT which is inversely proportional to the particle size. There is a corresponding increase in loss angle which is attributed to weak pinning of domain walls at surface defects. The volume fraction of single-domain and multidomain powder are deduced as a function of average particle size both in the unmagnetized and remanent states, from an analysis of high-field magnetization curves on isotropic powder. For example, about 87% of the volume of powder with an average size of 6.7 μm is multidomain in the unmagnetized state, but only 43% of the volume is multidomain in the remanent state. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363638
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  • 8
    Electronic Resource
    Electronic Resource
    Mössbauer study of the magnetic properties of RFe6Sn6 compounds (R=Y, Gd, Tb, Dy, Ho, Er, Tm) : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5181-5183 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic properties of RFe6Sn6 compounds (R=Y, Gd, Tb, Dy, Ho, Er, Tm) have been studied by magnetization and Mössbauer spectroscopy. Magnetization curves of isotropic powder samples at room temperature show a linear response up to 1.1 T with a susceptibility of 0.003–0.006 while Mössbauer spectra indicate magnetic order of Fe. These results confirm antiferromagnetic ordering of the compounds below a Néels point of approximately 400 K. The hyperfine fields of Fe at 25 K are ∼22 T, 45% greater than that for the isostructural FeSn although the difference in volume is only 3%. X-ray diffraction and Mössbauer spectra measured on magnetically oriented samples show that strong easy c-axis anisotropy of Fe sublattice dominates the anisotropy of these intermetallic compounds for any of the rare earth elements. A large quadrupole shift (∼0.30 mm/s at room temperature and 0.36 mm/s at 25 K) is consistent with the strong Fe sublattice anisotropy. The first anisotropy constant K1 was estimated to be of order 1.5×106 J/m3. ©1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365164
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  • 9
    Electronic Resource
    Electronic Resource
    Production and magnetotransport properties of CrO2 films : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5774-5776 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: CrO2 films were deposited on Al2O3 and TiO2 by high-pressure decomposition of CrO3. They are metallic, with a residual resistivity ρ0 in the range 0.2–10 μΩ m. The resistivity below Tc varies as ρ0+αT2+βT7/2 as expected for a correlated fully spin-polarized d band. At Tc the resistivity changes slope but the sign remains positive. There is a small negative magnetoresistance (∼−0.5%/ T) in a wide temperature range below Tc. Coercivity of the films varies according to the substrates from 7 mT for Al2O3 (110) to 15 mT for TiO2 (110). © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364682
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  • 10
    Electronic Resource
    Electronic Resource
    Aqueous phase in a perfluorocarboxylate membrane (1984)
    s.l. : American Chemical Society
    Macromolecules 17 (1984), S. 1331-1334 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00137a007
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