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Author (up) Guimpel, J.; Haberkorn, N.; Sirena, M.; Steren, L.B.; Saldarriaga, W.; Baca, E.; Gomez, M.E.
Title Interface effects in perovskite superlattices Type Journal Article
Year 2004 Publication JOURNAL OF LOW TEMPERATURE PHYSICS Abbreviated Journal
Volume 135 Issue 1-2 Pages 115-118
Keywords
Abstract The effect of interface disorder in perovskite superlattices, either with the substrate or between layers dominates the physics of the material, even when the lattice parameter of the component materials differs in less than 1%. Unexpected behavior emerges, like exchange bias in a system where no antiferromagnetic material has been included in the superlattice design.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0022-2291 ISBN Medium
Area Expedition Conference
Notes ISI:000189139000012 Approved no
Call Number BT @ hernan @ Serial 166
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Author (up) Haberkorn, N.; Guimpel, J.; Sirena, M.; Steren, L.B.; Saldarriaga, W.; Baca, E.; Gomez, M.E.
Title Antiferromagnetism at the YBa2Cu3O7/La2/3Ca1/3MnO3 interface Type Journal Article
Year 2004 Publication Applied Physics Letters Abbreviated Journal Appl. Phys. Lett.
Volume 84 Issue 19 Pages 3927-3929
Keywords
Abstract The magnetic properties of a series of YBa2Cu3O7-x/La2/3Ca1/3MnO3 (YBCO/LC1/3MO) superlattices grown by dc sputtering at high oxygen pressures (3.5 mbar) show the expected ferromagnetic behavior. However, field-cooled hysteresis loops at a low temperatures show the unexpected existence of exchange bias effect associated with the existence of ferromagnetic/antiferromagnetic (AF) interfaces. The blocking temperature (T-B) is found to be thickness dependent and the exchange bias field (H-EB) is found to be inversely proportional to the ferromagnetic layer thickness, as expected. The presence of an AF material is probably associated with interface disorder and Mn valence shift toward Mn4+. (C) 2004 American Institute of Physics.
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Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0003-6951 ISBN Medium
Area Expedition Conference
Notes ISI:000221210100069 Approved no
Call Number BT @ hernan @ Serial 165
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Author (up) Prieto, P.; Gomez, M.E.; Campillo, G.; Berger, A.; Baca, E.; Escudero, R.; Morales, F.; Guimpel, J.; Haberkorn, N.
Title Exchange-coupling effect and magnetotransport properties in epitaxial La2/3Ca1/3MnO3/La1/3Ca2/3MnO3 superlattices Type Journal Article
Year 2004 Publication PHYSICA STATUS SOLIDI A-APPLIED RESEARCH Abbreviated Journal
Volume 201 Issue 10 Pages 2343-2346
Keywords
Abstract We have measured structural, magnetic and, magneto transport properties of heterostructures consisting of La1-xCaxMnO3 ferromagnetic (FM) layers (x = 0.33) and antiferromagnetic (AF) layers (x = 0.67). FM/AF superlattices were grown by a high-pressure sputtering technique on (001) oriented SrTiO3 substrates. We have systematically varied the thickness of the ferromagnetic layers, while maintaining the thickness of the antiferromagnetic layers fixed. The total superlattice thickness was held approximately constant. The XRD analysis confirmed the existence of the superlattice structure by the multiple satellite peaks around the 001 manganite Bragg reflections. We have done field cooling (FC) and zero field cooling (ZFC) magnetization, and magneto resistance measurements at temperatures between 10 K and 280 K. The existence of an exchange bias effect at temperatures below the Neel temperature of the AF layer was revealed by magnetization loops after field cooling. The exchange bias field magnitude H-ex exhibited exponential temperature dependence below the blocking temperature, as well as an inverse proportionality with the ferromagnetic layer thickness. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0031-8965 ISBN Medium
Area Expedition Conference
Notes ISI:000223613800023 Approved no
Call Number BT @ hernan @ Serial 161
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