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Interfaces and functional oxydes

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Direct Evidence of Fe2+/Fe3+ Charge Ordering in the Ferrimagnetic Hematite-Ilmenite Fe1.35Ti0.65O3-d Thin Films

Submitted by laurabocher on Tue, 2013-10-15 07:00
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Here we report on the direct experimental evidence of Fe2+/Fe3+ charge ordering at room temperature in hematite-ilmenite Fe1.35Ti0.65O3-d epitaxial thin films grown by pulsed laser deposition, using aberration-corrected scanning transmission electron microscopy (STEM) coupled to high-resolution energy electron-loss spectroscopy (EELS). Read more »

Chemical Imaging at Atomic Resolution To Refine the Local Structure of Nanocrystals

Submitted by mathieukociak on Fri, 2012-01-27 21:01
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CeZr.jpg

Ce2Zr2O8 nanocrystals are characterized by aberration-corrected electron microscopy, core-loss electron energy-loss spectroscopy, and simulations. Read more »

Publications

Gloter, A., et al. Atomically resolved mapping of EELS fine structures. Materials Science in Semiconductor Processing 65, 2 - 17 (2017). Download: 1-s2.0-S1369800116302165-main.pdf (5.7 MB)
Popova, E., et al. Interplay between epitaxial strain and low dimensionality effects in a ferrimagnetic oxide. Journal of Applied Physics 121, (2017). Download: Popova_JAP2017_Strain-STEM-GPA.pdf (4.49 MB)
Inan Akmehmet, G., et al. Structure and Luminescence in Long Persistence Eu, Dy, and B Codoped Strontium Aluminate Phosphors: The Boron Effect. Journal of the American Ceramic Society n/a - n/a (2016).doi:10.1111/jace.14188 Download: Akmehmet_et_al-2016-Journal_of_the_American_Ceramic_Society.pdf (505.64 KB)
Phillips, L.C., et al. Local electrical control of magnetic order and orientation by ferroelastic domain arrangements just above room temperature. Scientific Reports 5, 10026 (2015).
Li, X., et al. Direct evidence of tungsten clustering in W0.02V0.98O2 thin films and its effect on the metal-to-insulator transition. Acta Materialia 80, 16 - 24 (2014).
Bocher, L., et al. Direct Evidence of Fe2+/Fe3 Charge Ordering in the Ferrimagnetic Hematite-Ilmenite Fe1.35Ti0.65O3-d Thin Films. Physical Review Letters 111, (2013). Download: Bocher_PRL13_Fe2+Fe3+-FTO.pdf (1.18 MB)
Chen, S.-Y., et al. Concentration Dependence of Oxygen Vacancy on the Magnetism of CeO 2 Nanoparticles. The Journal of Physical Chemistry C 116, 8707 - 8713 (2012).
Deboudt, K., Gloter, A., Mussi, A. & Flament, P. Red-ox speciation and mixing state of iron in individual African dust particles. Journal of Geophysical Research 117, (2012).
Hu, M.-H., et al. Investigation of the thermal stability of Mg/Co periodic multilayers for EUV applications. Applied Physics A 106, 737 - 745 (2012).
Bocher, L., et al. Atomic and Electronic Structure of the BaTiO 3 /Fe Interface in Multiferroic Tunnel Junctions. Nano Letters 12, 376 - 382 (2012). Download: Bocher-Nanoletters12.pdf (2.76 MB)
Estradé, S., et al. Effect of the capping on the local Mn oxidation state in buried (001) and (110) SrTiO3/La2/3Ca1/3MnO3 interfaces. Journal of Applied Physics 110, 103903 (2011).
Yang, M., Baik, H., Ivanovskaya, V.V., Colliex, C. & Benayad, A. O K-energy loss near-edge structure change induced by tantalum impurity in monoclinic hafnium oxide. Journal Of Applied Physics 109, 053723 (2011).
Valencia, S., et al. Interface-induced room-temperature multiferroicity in BaTiO3. Nature Materials 10, 753 - 758 (2011). Download: Valencia_NatMat11_XMCD-BTOFe.pdf (761.54 KB)
Torres-Pardo, A., et al. Spectroscopic mapping of local structural distortions in ferroelectric PbTiO_{3}/SrTiO_{3} superlattices at the unit-cell scale. Physical Review B 84, (2011).
Garcia, V., et al. Ferroelectric Control of Spin Polarization. Science 327, 1106–1110 (2010). Download: Garcia_Science10_ferroelectric_LSMO-BTO-Fe.pdf (400.27 KB)
Sefrioui, Z., et al. All-Manganite Tunnel Junctions with Interface-Induced Barrier Magnetism. Advanced Materials 22, 5029–+ (2010).
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