Výsledky vyhledávání - "Isabelle Letard"

X-ray magnetic circular dichroism study of iron/iron oxide granular nanostructures

Autor: Ennio Bonetti, Philippe Sainctavit, Federico Boscherini, Isabelle Letard, Luca Pasquini, Sandrine Brice-Profeta, Luca Signorini

Publikováno v: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Elsevier, 2006, 246, pp.20-24. ⟨10.1016/j.nimb.2005.12.012⟩
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2006, 246, pp.20-24. ⟨10.1016/j.nimb.2005.12.012⟩
246 (2006): 20–24.
info:cnr-pdr/source/autori:Signorini, L; Pasquini, L; Boscherini, F; Bonetti, E; Letard, I; Brice-Profeta, S; Sainctavit, P/titolo:X-ray magnetic circular dichroism study of iron%2Firon oxide granular nanostructures/doi:/rivista:/anno:2006/pagina_da:20/pagina_a:24/intervallo_pagine:20–24/volume:246

We present a study of the local magnetic properties of an iron/iron oxide nanostructured granular system by X-ray magnetic circular dichroism. The samples investigated consist of metallic iron (alpha-Fe) nanoparticles embedded in a nanocrystalline ox

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7d36430284d2c7a067c73c1dfdb5b34a
https://doi.org/10.1016/j.nimb.2005.12.012

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XMCD at Fe L2,3 edges, Fe and S K edges on Fe7S8

Autor: Philippe Sainctavit, Isabelle Letard, Catherine Deudon

Publikováno v: Phys Chem Minerals
Phys Chem Minerals, 2007, 34, pp.113-120. ⟨10.1007/s00269-006-0132-8⟩

Pyrrhotite (Fe7S8) is a natural iron sulphide that can participate in rock magnetisation. Its electronic structure is not yet surely described. X-ray magnetic circular dichroism (XMCD) at Fe L2,3 edges on Fe7S8, coupled with multiplet calculations, s

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8a33c1adc0c85942831cbed9230ea42d
https://hal.science/hal-00195319

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Redox and Speciation of Uranium in Al-Rich Perovskites from High-Pressure/High-Temperature Conditions

Autor: Isabelle Letard, Laurent Gautron, Steeve Gréaux, François Farges, Pierre Lagarde, Anne-Marie Flank

Publikováno v: AIP Conference Proceedings.

Macro‐, and microXANES and EXAFS spectra were collected at the U‐L3, Al‐K, Si‐K and Ca‐K edges in high pressure/high temperature CaSiO3 perovskite that aim to simulate one potential reservoir for the Earth heat flow. In that perovskite, U i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2e7304e1032a3d777eeec1fe6d64dcfc
https://doi.org/10.1063/1.2644494

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Relaxations around the substitutional chromium site in emerald: X-ray absorption experiments and density functional calculations

Autor: Andrei Rogalev, Isabelle Letard, Emilie Gaudry, Delphine Cabaret, Philippe Sainctavit, Christian Brouder, Fabrice Wilhlem, Nicolas Jaouen

International audience; We determine the local crystallographic and electronic structure around the chromium impurity in emerald

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7340d49b7f43f5efc59eeafea7378b0f
https://hal.archives-ouvertes.fr/hal-00195334

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Remnant magnetization of Fe8 high-spin molecules: X-ray magnetic circular dichroism at 300 mK

Autor: Bruno Doddi, Dante Gatteschi, Paolo Ghigna, Christophe Cartier dit Moulin, Jean-Paul Kappler, Philippe Sainctavit, Isabelle Letard

Publikováno v: Journal of Applied Physics
Journal of Applied Physics, American Institute of Physics, 2007, 101, pp.113920. ⟨10.1063/1.2745318⟩
Journal of Applied Physics, 2007, 101, pp.113920. ⟨10.1063/1.2745318⟩

Fe8 high-spin molecules exhibit quantum spin tunneling at very low temperatures. Eight Fe3+ ions are sixfold coordinated and magnetically coupled through oxygen bridges. The net magnetization (MS=20 μB per molecule) results from competing antiferrom

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3cf2b4cfb19441a333b2941938069404
https://hal.archives-ouvertes.fr/hal-00195313

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From the green color of eskolaite to the red color of ruby: an X-ray absorption spectroscopy study

Autor: Federica Bondioli, Emilie Gaudry, Philippe Ohresser, Isabelle Letard, Farid Juillot, Philippe Sainctavit

Publikováno v: Physics and Chemistry of Minerals
Physics and Chemistry of Minerals, 2006, 32, pp.710-720. ⟨10.1007/s00269-005-0046-x⟩
Physics and Chemistry of Minerals, Springer Verlag, 2006, 32, pp.710-720. ⟨10.1007/s00269-005-0046-x⟩

The best known cause for colors in insulating minerals is due to transition metal ions as impurities. As an example, Cr3+ is responsible for the red color of ruby (α-Al2O3:Cr3+) and the green color of eskolaite (α-Cr2O3). Using X-ray absorption mea

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c81c896c8a3604c32f0d3dd02ddcf3a3
https://hdl.handle.net/11380/2983

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X-ray Spectroscopy and Magnetism in Mineralogy

Autor: Sandrine Brice-Profeta, Isabelle Letard, Emilie Gaudry, Marie-Anne Arrio, Philippe Sainctavit

Publikováno v: Magnetism: A Synchrotron Radiation Approach ISBN: 9783540332411
Magnetism : A Synchrotron Radiation Approach, Lecture Notes in Physics
Magnetism : A Synchrotron Radiation Approach, Lecture Notes in Physics, Springer verlag, pp.1, 2006

The objective of this paper is to present the kind of information that can be gained in the field of mineralogy from the use of x-ray magnetic spectroscopies. We review some of the questions that are unsettled and that could benefit from an interdisc

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f1a37a3ec3fbf4251e30aa9f06128a40
https://doi.org/10.1007/3-540-33242-1_14

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Local magnetism in granular iron/iron oxide nanostructures by phase- and site-selective x-ray magnetic circular dichroism

Autor: Sandrine Brice-Profeta, Ennio Bonetti, Luca Pasquini, Philippe Sainctavit, Federico Boscherini, Isabelle Letard, Luca Signorini

Publikováno v: Physical Review B: Condensed Matter and Materials Physics (1998-2015)
Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2006, 74, pp.014426. ⟨10.1103/PhysRevB.74.014426⟩
Physical review. B, Condensed matter and materials physics 74 (2006): 014426.
info:cnr-pdr/source/autori:L. Signorini; L. Pasquini; F. Boscherini; E. Bonetti; I. Letard; S. Brice-Profeta; Ph. Sainctavit/titolo:Local magnetism in granular iron%2Firon oxide nanostructures: a phase-and site-selective X-ray magnetic circular dichroism study/doi:/rivista:Physical review. B, Condensed matter and materials physics/anno:2006/pagina_da:014426/pagina_a:/intervallo_pagine:014426/volume:74
Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2006, 74, pp.014426. ⟨10.1103/PhysRevB.74.014426⟩

We present a study of the local magnetic properties of iron/iron oxide granular nanostructures by x-ray magnetic circular dichroism (XMCD). Metallic iron $(\ensuremath{\alpha}\text{\ensuremath{-}}\mathrm{Fe})$ nanoparticles, with average sizes rangin

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::10e940338c80bca7d5fe47ffc92909f6
https://hal.archives-ouvertes.fr/hal-00105746

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XMCD Signals of the High Spin Molecules Fe8

Autor: Dante Gatteschi, Jean-Paul Kappler, Isabelle Letard, Ch. Cartier dit Moulin, Ph. Sainctavit, Guillaume Champion

Publikováno v: Physica Scripta. :635

Fe8 clusters are molecules which show quantum spin tunneling at very low temperature. They have eight iron ions that are six-fold coordinated and magnetically coupled through oxygen bridges. The net magnetization (Ms = 20 μB per molecule) results fr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c8e71839cdb95a89c8e8f054c192a178
https://doi.org/10.1238/physica.topical.115a00635

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