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Author (up) Haberkorn, N.; Bridoux, G.; Osquiguil, E.; Nieva, G.; Guimpel, J.
Title Hall effect in a GdBa2Cu3O7-?/La0.75 Sr0.25MnO3 perovskite bilayer Type Journal Article
Year 2007 Publication Applied Surface Science Abbreviated Journal Appl. Surf. Sci.
Volume 254 Issue 1 SPEC. ISS. Pages 222-224
Keywords Hall effect; Perovskite Bilayer; Barium compounds; Ferromagnetic materials; Films; Hall effect; Magnetic fields; Magnetron sputtering; Manganites; Perovskite; Strontium compounds; Superconducting devices; Dc magnetron sputtering; Electric transport; Hall resistivity regimes; Oxygen doping; Gadolinium compounds
Abstract We present results on the Hall coefficient RH in the normal state for a GdBa2Cu3O7-?/La0.75 Sr0.25MnO3 bilayer and a La0.75Sr0.25MnO3 film grown by dc magnetron sputtering on (1 0 0) SrTiO3. We find that the electric transport on the bilayer can be qualitatively described using a simple parallel layers model. The GdBa2Cu3O7-? layer presents a carrier density approximately equal to that reported for 7 – ? = 6.85 oxygen doping. Also we observe an unexpected presence of two Hall resistivity regimes, effects that may be associated with the internal magnetic field induced on the superconducting layer by the ferromagnetic layer.
Address Instituto Balseiro, Universidad Nacional de Cuyo, Comisi
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ISSN 01694332 (ISSN) ISBN Medium
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Notes Export Date: 17 April 2009; Source: Scopus; CODEN: ASUSE; doi: 10.1016/j.apsusc.2007.07.041; Language of Original Document: English; Correspondence Address: Haberkorn, N.; Comisi Approved no
Call Number BT @ osquigui @ Serial 363
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Author (up) Kasama, T.; Moreno, M.S.; Dunin-Borkowski, R.E.; Newcomb, S.B.; Haberkorn, N.; Guimpel, J.; Midgley, P.A.
Title Characterization of the magnetic properties of a GdBa2Cu3O7/La0.75Sr0.25MnO3 superlattice using off-axis electron holography Type Journal Article
Year 2006 Publication Applied Surface Science Abbreviated Journal Appl. Surf. Sci.
Volume 252 Issue 11 Pages 3977-3983
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Abstract Off-axis electron holography is used to characterize the magnetic properties of a GdBa2Cu3O7/La0.75Sr0.25MnO3 superlattice below the Curie temperature of the manganite layers, in both cross-sectional and plan-view geometry. The samples were prepared for electron microscopy using focused ion beam milling. Differences between the magnetic properties of successive manganite layers are observed in the cross-sectional sample. Magnetic ripple contrast and weakly magnetic regions are observed in plan-view geometry. Although the results may be affected by sample preparation for electron microscopy, the observed differences between the magnetic properties of the manganite layers are consistent between the different samples examined. (c) 2005 Elsevier B.V. All rights reserved.
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Notes ISI:000236835200013 Approved no
Call Number BT @ hernan @ Serial 155
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Author (up) Kaul, E.E.; Haberkorn, N.; Guimpel, J.
Title Crystalline orientation of BiMnO3 thin films grown by rf-sputtering Type Journal Article
Year 2007 Publication Applied Surface Science Abbreviated Journal Appl. Surf. Sci.
Volume 254 Issue 1 Pages 160-163
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Abstract BiMnO3 thin films were deposited by means of rf-sputtering onto [1 0 0] oriented SrTiO3 substrates. X-ray diffraction measurements revealed epitaxial growth with [0 0 1](m) orientation in the monoclinic structure representation, equivalent to the [1 1 1](pc) direction of the pseudocubic cationic lattice. This [0 0 1](m) orientation was obtained in a wide deposition parameters range. Preliminary magnetization measurements suggest that these films do not present ferromagnetism below the bulk Curie temperature, T-c = 105 K. (C) 2007 Elsevier B.V. All rights reserved.
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Notes ISI:000250800100037 Approved no
Call Number BT @ hernan @ Serial 147
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Author (up) Monton, C.; Guimpel, J.; de la Cruz, F.
Title Superconducting behaviour of Nb/Co superlattices Type Journal Article
Year 2007 Publication Applied Surface Science Abbreviated Journal Appl. Surf. Sci.
Volume 254 Issue 1 Pages 375-377
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Abstract We study the superconducting and magnetic behaviour of Nb/Co superlattices, for superconducting Nb layer thickness of 44 nm and Co layer thickness less than 1 nm. In this limit no ferromagnetism is observed for Co. The superlattice behaves as independent superconducting Nb layers. We obtain the penetration depth and superconducting gap of the material, and analyze the results in terms of microscopic models and theories. (C) 2007 Elsevier B.V. All rights reserved.
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Notes ISI:000250800100085 Approved no
Call Number BT @ hernan @ Serial 149
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