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  • Conference paper
    Muxworthy AR, Williams W, 2003,

    The Role of Magnetostatic Interactions on the Anisotropy of Magnetic Remanence: Micromagnetic Modeling of Distribution Anisotropy (invited)

    , AGU Fall
  • Conference paper
    Muxworthy AR, Williams W, Virdee D, Carvallo Cet al., 2003,

    Micromagnetic modelling of magnetostatic interactions (invited)

    , EGS-AGU-EUG
  • Conference paper
    Muxworthy AR, Dunlop DJ, Ozdemir O, 2003,

    Low-temperature cycling of isothermal and anhysteretic remanence: microcoercivity and magnetic memory

    , IUGG
  • Conference paper
    Muxworthy AR, Williams W, Virdee D, Carvallo Cet al., 2003,

    Micromagnetic modelling of magnetostatic interactions: hysteresis and FORC diagrams (invited)

    , 1st International Workshop on Magnetism, Hysteresis and the FORC method
  • Conference paper
    Muxworthy AR, McClelland E, Williams W, 2003,

    Understanding viscous magnetisation in multidomain minerals

    , IUGG
  • Journal article
    Watson JS, Pearson VK, Gilmour I, Sephton MAet al., 2003,

    Contamination by sesquiterpenoid derivatives in the Orgueil carbonaceous chondrite

    , ORGANIC GEOCHEMISTRY, Vol: 34, Pages: 37-47, ISSN: 0146-6380
  • Journal article
    Wombacher F, Rehkämper M, 2003,

    Investigation of the mass discrimination of multiple collector ICP-MS using neodymium isotopes and the generalised power law

    , JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, Vol: 18, Pages: 1371-1375, ISSN: 0267-9477
  • Book chapter
    Woodland SJ, Rehkamper M, Lee D-C, Halliday ANet al., 2003,

    High precision MC-ICPMS measurement of silver isotopic compositions

    , Plasma Source Mass Spectrometry, Editors: Holland, Tanner SD, London, Publisher: Royal Society of Chemistry, Pages: 338-350
  • Conference paper
    Williams W, Ridley P, Muxworthy AR, 2003,

    The Effect of Grain Shape on the Magnetic Properties of Magnetite: A Finite Element Approach

    , AGU Fall
  • Conference paper
    Muxworthy A R, Carvallo C, Dunlop D J, 2002,

    Micromagnetic modeling of First-Order Reversal Curves (FORC) diagrams for single-domain pseudo-single-domain magnetite (poster)

    , AGU Fall
  • Journal article
    Sephton MA, Amor K, Franchi IA, Wignall PB, Newton R, Zonneveld JPet al., 2002,

    Carbon and nitrogen isotope disturbances and an end-Norian (Late Triassic) extinction event

    , GEOLOGY, Vol: 30, Pages: 1119-1122, ISSN: 0091-7613
  • Journal article
    Pearson VK, Sephton MA, Kearsley AT, Bland PA, Franchi IA, Gilmour Iet al., 2002,

    Clay mineral-organic matter relationships in the early solar system

    , METEORITICS & PLANETARY SCIENCE, Vol: 37, Pages: 1829-1833, ISSN: 1086-9379
  • Journal article
    Muxworthy AR, Dunlop DJ, 2002,

    First-order reversal curve (FORC) diagrams for pseudo-single-domain magnetites at high temperature

    , EARTH PLANET SC LETT, Vol: 203, Pages: 369-382, ISSN: 0012-821X

    The recently developed first-order reversal curve (FORC) technique for rapidly examining magnetic domain state has great potential for paleomagnetic and environmental magnetic investigations. However, there are still some gaps in the basic understanding of FORC diagrams, in particular the behavior of pseudo-single-domain (PSD) grains and the contribution of magnetostatic interactions. In this paper we address some of these problems. We report the first FORC diagrams measurements on narrowly sized and well-characterized synthetic PSD through multidomain (MD) magnetite samples. The FORC diagrams evolve with grain size from single-domain (SD)-like to MD-like through the PSD grain size range. Since each sample contains grains of essentially a single size, individual PSD grains evidently contain contributions from both SD-like and MD-like magnetic moments, in proportions that vary with grain size; the evolving FORC diagrams cannot be due to physical mixtures of SD and MD grains of widely different sizes. The FORC diagrams were all asymmetric. Small PSD samples have FORC diagrams with a distinctive closed-contour structure. The distributions of the larger MD grains display no peak, and lie closer to the interaction-field axis. To assess the effect of magnetostatic interactions, we measured FORC diagrams between room temperature and the Curie temperature. On heating the FORC distributions contract without changing shape until similar to500degreesC. Above this temperature the diagrams become more MD-like, and in addition become more symmetric. The temperature dependence of the interaction-field parameter is proportional to that of the saturation magnetization, in accordance with Neel's interpretation of the Preisach diagram. The decrease in asymmetry with heating suggests that the origin of the asymmetry lies in magnetostatic interactions. The magnetic hysteresis parameters as a function of temperature were determined from the FORC curves. As the grain size decreased the no
  • Journal article
    Croskell M, Warner M, Morgan J, 2002,

    Annealing of shocked quartz during atmospheric re-entry

    , GEOPHYSICAL RESEARCH LETTERS, Vol: 29, ISSN: 0094-8276
  • Journal article
    Weyer S, Münker C, Rehkämper M, Mezger Ket al., 2002,

    Determination of ultra-low Nb, Ta. Zr and Hf concentrations and the chondritic Zr/Hf and Nb/Ta ratios by isotope dilution analyses with multiple collector ICP-MS

    , CHEMICAL GEOLOGY, Vol: 187, Pages: 295-313, ISSN: 0009-2541
  • Conference paper
    Nielsen SG, Rehkämper M, Porcelli D, Swarzenski P, Halliday Aet al., 2002,

    Isotopic compositions and concentrations of estuarine thallium

    , Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: A554-A554, ISSN: 0016-7037
  • Conference paper
    Schönbächler M, Lee DC, Halliday A, Rehkämper M, Hattendorf B, Günther Det al., 2002,

    <SUP>92</SUP>Nb-<SUP>92</SUP>Zr chronometry and early lunar evolution

    , Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: A686-A686, ISSN: 0016-7037
  • Conference paper
    Wombacher F, Rehkämper M, Mezger K, Münker C, Bischoff Aet al., 2002,

    Stable isotope compositions of Cadmium in stony meteorites

    , Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: A844-A844, ISSN: 0016-7037
  • Conference paper
    Halliday AN, Lee DC, Fehr M, Quitté G, Porcelli D, Rehkämper M, Stirling C, Schönbächler M, Woodland Set al., 2002,

    Accretion and accredited anomalies

    , Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: A304-A304, ISSN: 0016-7037
  • Conference paper
    Fehr M, Rehkämper M, Halliday AN, Porcelli Det al., 2002,

    Tellurium isotopes and the origin of the solar system

    , Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: A227-A227, ISSN: 0016-7037

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