Search Results - (Author, Cooperation:M. B. Madsen)

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  1. 1
    Staff View
    Publication Date:
    2013-06-01
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.aaas.org/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Staff View
    Publication Date:
    2013-09-28
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.aaas.org/

    Latest Papers from Table of Contents or Articles in Press
  3. 3
    P. Y. Meslin ; O. Gasnault ; O. Forni ; S. Schroder ; A. Cousin ; G. Berger ; S. M. Clegg ; J. Lasue ; S. Maurice ; V. Sautter ; S. Le Mouelic ; R. C. Wiens ; C. Fabre ; W. Goetz ; D. Bish ; N. Mangold ; B. Ehlmann ; N. Lanza ; A. M. Harri ; R. Anderson ; E. Rampe ; T. H. McConnochie ; P. Pinet ; D. Blaney ; R. Leveille ; D. Archer ; B. Barraclough ; S. Bender ; D. Blake ; J. G. Blank ; N. Bridges ; B. C. Clark ; L. DeFlores ; D. Delapp ; G. Dromart ; M. D. Dyar ; M. Fisk ; B. Gondet ; J. Grotzinger ; K. Herkenhoff ; J. Johnson ; J. L. Lacour ; Y. Langevin ; L. Leshin ; E. Lewin ; M. B. Madsen ; N. Melikechi ; A. Mezzacappa ; M. A. Mischna ; J. E. Moores ; H. Newsom ; A. Ollila ; R. Perez ; N. Renno ; J. B. Sirven ; R. Tokar ; M. de la Torre ; L. d'Uston ; D. Vaniman ; A. Yingst
    American Association for the Advancement of Science (AAAS)
    Published 2013
    Staff View
    Publication Date:
    2013-09-28
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.aaas.org/

    Latest Papers from Table of Contents or Articles in Press
  4. 4
    Madsen, M. B. ; Mørup, S. ; Costa, T. V. V. ; Knudsen, J. M. ; Olsen, M.

    [s.l.] : Nature Publishing Group
    Published 1986
    Staff View
    ISSN:
    1476-4687
    Source:
    Nature Archives 1869 - 2009
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Notes:
    [Auszug] The sample of the carbonaceous chondrite Orgueil was ground into a powder and a Mossbauer absorber was prepared in a plexiglass absorber holder. Mossbauer spectra were obtained at various applied magnetic fields and temperatures. Figure 1 shows a series of Mossbauer spectra of the meteorite ...
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1038/321501a0

    Articles: DFG German National Licenses
  5. 5
    Staff View
    ISSN:
    1432-2021
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Geosciences
    Physics
    Notes:
    Abstract Magnetization curves and high-field Mössbauer spectra are used to deduce a model for the magnetic order in synthetic samples of δ-FeOOH (feroxyhyte), which takes account of the changes in magnetization when the samples are heated at 105 °C. Feroxyhyte is essentially a planar antiferromagnet with the net sublattice moments aligned parallel or antiparallel to c. Each particle acquires a net moment due to the very small number of layers along the c-direction, and the presence of surface steps causing the formation of ferrimagnetic domains with an odd number of layers. There is some spin canting which is related to the crystallinity of the sample. The decrease in magnetization following heating is mainly due to an increase in the extent of antiferromagnetic coupling between the closely packed ferrimagnetic particles, but changes in the spin canting within the bulk may also contribute. A typical, rather well crystallized specimen has magnetization σ=14 JT−1 kg−1 and Curie temperature T c=455 K.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00202774

    Articles: DFG German National Licenses
  6. 6
    Staff View
    ISSN:
    1572-9540
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract A ferrofluid with ultrasmall magnetic particles (d≅3.3 nm) of amorphous Fe1−x C x has been studied by Mössbauer spectroscopy and electron microscopy. The values of the particle size estimated by the two methods are in good agreement. The magnetic anisotropy energy constant,K=(1.0±0.3)×105 J m−3 has been estimated.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF02407828

    Articles: DFG German National Licenses
  7. 7
    Staff View
    ISSN:
    1572-9540
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract The iron mineralogy of samples of the Monturaqui impactite has been studied by Mössbauer spectroscopy. Magnetite, maghemite, goethite and a ferrous glass phase were identified. In a magnetic separate a bcc-structured iron-nickel alloy was identified in addition to the oxide phases. The oxides have formed by weathering of iron-nickel alloys.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF02397488

    Articles: DFG German National Licenses
  8. 8
    Staff View
    ISSN:
    1572-9540
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract A Mössbauer spectrometer is included in the preliminary payload of a rover to be placed on the surface of Mars in the Soviet mission to the planct in 1996/1,2/. In counection with the American planctary program it has also been suggested to construct a Mössbauer spectrometer to be landed on Mars /3, 4/. The objective is to study the iron compounds of the Martian soil and rocks by backscattering Mössbauer spectroscopy. The paper describes the significance of the element iron in the study of the evolution of the planetary system and what we might expect to learn from Mössbauer spectroscopy of the surface materials of Mars. The study of Mars is expected to expand substantially in the coming decades, probably culminating with a manned flight to the planet. The international Mössbauer community may contribute significantly to the preparation of these events.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF02396454

    Articles: DFG German National Licenses
  9. 9
    Madsen, M. B. ; Mørup, S. ; Knudsen, J. M.
    Springer
    Published 1989
    Staff View
    ISSN:
    1572-9540
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract The meteorite Orgueil is a carbonaceous chondrite of type CI. Carbonaceous chondrites contain Fe(III), Fe(II) and in some cases metallic iron, indicating that they are in a state far from thermodynamic equilibrium. In Orgueil about 40% of the iron is present in magnetite (Fe3O4). In this work a sample of magnetite grains extracted from Orgueil has been studied by Mössbauer spectroscopy. It has been found that the magnetic phase contains about 11% of maghemite and that the remaining magnetite has a vacancy concentration smaller than 0.006, corresponding to the formula Fe2.994O4.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF02407705

    Articles: DFG German National Licenses
  10. 10
    Staff View
    ISSN:
    1572-9540
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract The significance of the element titanium for the study of the magnetic mineral in the surface dust of Mars is described.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF02146321

    Articles: DFG German National Licenses
  11. 11
    Gunnlaugsson, H. P. ; Koch, C. Bender ; Madsen, M. B.
    Springer
    Published 1994
    Staff View
    ISSN:
    1572-9540
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract Magnetite is the most common magnetic phase in carbonaceous chondrites. Comprehensive and detailed investigations of this magnetite with X-ray diffraction and electron microprobe have revealed minute amounts of substitutional impurities (e.g. Ni) in the magnetite, but no other magnetic oxides have been found in these meteorites. Using an external magnetic field and Mössbauer spectroscopy, we have found a component in the Mössbauer spectrum that we attribute to maghemite. The relative area of this component implies that maghemite accounts for approximately 12% of the magnetic oxides in Orgueil.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF02064575

    Articles: DFG German National Licenses
  12. 12
    Staff View
    ISSN:
    1572-9540
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract We have modified the iron-containing layer silicate nontronite into a magnetic sample by heat treatment at 900
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF02064565

    Articles: DFG German National Licenses
  13. 13
    Staff View
    ISSN:
    1572-9540
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract The meteorites called carbonaceous chondrites are the least altered samples we have of the material which formed our solar system. Using57Fe Mössbauer spectroscopy we show that the carbonaceous chondrite Murchison contains a compound exhibiting superparamagnetic relaxation below 80 K.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF02400518

    Articles: DFG German National Licenses