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Title: Effect of epitaxial strain on the exchange-bias properties of [La{sub 0.67}Ca{sub 0.33}MnO{sub 3}/La{sub 0.33}Ca{sub 0.67}MnO{sub 3}]{sub 15} multilayers: Resonant x-ray scattering measurements

Abstract

Complementary x-ray synchrotron radiation diffraction (XRD) and resonant scattering (RXS) measurements were performed at the Mn K-edge between 10 and 300 K in order to analyze the effect of epitaxial strain and tetragonal lattice distortions on the exchange bias (EB) mechanism observed in [La{sub 2/3}Ca{sub 1/3}MnO{sub 3}(FM)/La{sub 1/3}Ca{sub 2/3}MnO{sub 3}(AF)]{sub 15} multilayers below a blocking temperature, T{sub B}, of 80 K. XRD measurements showed that the c/a axial ratio, an indication of the tetragonal lattice distortion in pseudocubic lattice settings, reaches its maximum at the onset of the EB effect and the corresponding structural correlation length varies substantially at the onset of T{sub B}. The in-plane lattice parameter a at T{sub B} is close to the bulk lattice parameters of the antiferromagnetic (AF) layers, thus indicating that the EB effect is related with the accommodation of strain inside the ferromagnetic (FM) and AF layers. RXS measurements revealed a ferrodistortive (FD) state. The RXS intensity difference signal exhibits a main-edge feature and a postedge feature at {approx}6.57 keV that scales linearly with temperature and the c/a ratio up to 80 K. The disappearance of the postedge feature above 80 K(=T{sub B}) may signify a rearrangement of Mn-O-Mn bonding angles due tomore » strain-driven effects at the FM/AF interfaces, inducing disorder in FD octahedral tilt ordering which may pin the local distortions below the T{sub B}.« less

Authors:
; ; ; ; ;  [1];  [2];  [3];  [3];  [2];  [4]
  1. Department of Engineering Sciences, School of Engineering, University of Patras, 26504 Patras, Greece and Department of Chemistry, University of Durham, Durham DH1 3LE (United Kingdom)
  2. (France)
  3. (Greece)
  4. (United Kingdom)
Publication Date:
OSTI Identifier:
20976639
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 75; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevB.75.014432; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; ANTIFERROMAGNETISM; AXIAL RATIO; BOND ANGLE; CALCIUM COMPOUNDS; EPITAXY; KEV RANGE 01-10; LANTHANUM COMPOUNDS; LATTICE PARAMETERS; LAYERS; RESONANCE SCATTERING; STRAINS; SYNCHROTRON RADIATION; TEMPERATURE RANGE 0065-0273 K; TETRAGONAL LATTICES; X RADIATION; X-RAY DIFFRACTION

Citation Formats

Christides, C., Deen, P. P., Moutis, N., Houssakou, E., Bouchenoire, L., Prassides, K., Institut Laue Langevin, 6 Rue Jules Horowitz, Boite Postale 156, 38042 Grenoble Cedex, Institute of Materials Science, NCSR Demokritos, 15310 Athens, Department of Engineering Sciences, School of Engineering, University of Patras, 26504 Patras, XMaS CRG, ESRF, Boite Postale 220, 38043 Grenoble Cedex, and Department of Chemistry, University of Durham, Durham DH1 3LE. Effect of epitaxial strain on the exchange-bias properties of [La{sub 0.67}Ca{sub 0.33}MnO{sub 3}/La{sub 0.33}Ca{sub 0.67}MnO{sub 3}]{sub 15} multilayers: Resonant x-ray scattering measurements. United States: N. p., 2007. Web. doi:10.1103/PHYSREVB.75.014432.
Christides, C., Deen, P. P., Moutis, N., Houssakou, E., Bouchenoire, L., Prassides, K., Institut Laue Langevin, 6 Rue Jules Horowitz, Boite Postale 156, 38042 Grenoble Cedex, Institute of Materials Science, NCSR Demokritos, 15310 Athens, Department of Engineering Sciences, School of Engineering, University of Patras, 26504 Patras, XMaS CRG, ESRF, Boite Postale 220, 38043 Grenoble Cedex, & Department of Chemistry, University of Durham, Durham DH1 3LE. Effect of epitaxial strain on the exchange-bias properties of [La{sub 0.67}Ca{sub 0.33}MnO{sub 3}/La{sub 0.33}Ca{sub 0.67}MnO{sub 3}]{sub 15} multilayers: Resonant x-ray scattering measurements. United States. doi:10.1103/PHYSREVB.75.014432.
Christides, C., Deen, P. P., Moutis, N., Houssakou, E., Bouchenoire, L., Prassides, K., Institut Laue Langevin, 6 Rue Jules Horowitz, Boite Postale 156, 38042 Grenoble Cedex, Institute of Materials Science, NCSR Demokritos, 15310 Athens, Department of Engineering Sciences, School of Engineering, University of Patras, 26504 Patras, XMaS CRG, ESRF, Boite Postale 220, 38043 Grenoble Cedex, and Department of Chemistry, University of Durham, Durham DH1 3LE. Mon . "Effect of epitaxial strain on the exchange-bias properties of [La{sub 0.67}Ca{sub 0.33}MnO{sub 3}/La{sub 0.33}Ca{sub 0.67}MnO{sub 3}]{sub 15} multilayers: Resonant x-ray scattering measurements". United States. doi:10.1103/PHYSREVB.75.014432.
@article{osti_20976639,
title = {Effect of epitaxial strain on the exchange-bias properties of [La{sub 0.67}Ca{sub 0.33}MnO{sub 3}/La{sub 0.33}Ca{sub 0.67}MnO{sub 3}]{sub 15} multilayers: Resonant x-ray scattering measurements},
author = {Christides, C. and Deen, P. P. and Moutis, N. and Houssakou, E. and Bouchenoire, L. and Prassides, K. and Institut Laue Langevin, 6 Rue Jules Horowitz, Boite Postale 156, 38042 Grenoble Cedex and Institute of Materials Science, NCSR Demokritos, 15310 Athens and Department of Engineering Sciences, School of Engineering, University of Patras, 26504 Patras and XMaS CRG, ESRF, Boite Postale 220, 38043 Grenoble Cedex and Department of Chemistry, University of Durham, Durham DH1 3LE},
abstractNote = {Complementary x-ray synchrotron radiation diffraction (XRD) and resonant scattering (RXS) measurements were performed at the Mn K-edge between 10 and 300 K in order to analyze the effect of epitaxial strain and tetragonal lattice distortions on the exchange bias (EB) mechanism observed in [La{sub 2/3}Ca{sub 1/3}MnO{sub 3}(FM)/La{sub 1/3}Ca{sub 2/3}MnO{sub 3}(AF)]{sub 15} multilayers below a blocking temperature, T{sub B}, of 80 K. XRD measurements showed that the c/a axial ratio, an indication of the tetragonal lattice distortion in pseudocubic lattice settings, reaches its maximum at the onset of the EB effect and the corresponding structural correlation length varies substantially at the onset of T{sub B}. The in-plane lattice parameter a at T{sub B} is close to the bulk lattice parameters of the antiferromagnetic (AF) layers, thus indicating that the EB effect is related with the accommodation of strain inside the ferromagnetic (FM) and AF layers. RXS measurements revealed a ferrodistortive (FD) state. The RXS intensity difference signal exhibits a main-edge feature and a postedge feature at {approx}6.57 keV that scales linearly with temperature and the c/a ratio up to 80 K. The disappearance of the postedge feature above 80 K(=T{sub B}) may signify a rearrangement of Mn-O-Mn bonding angles due to strain-driven effects at the FM/AF interfaces, inducing disorder in FD octahedral tilt ordering which may pin the local distortions below the T{sub B}.},
doi = {10.1103/PHYSREVB.75.014432},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 1,
volume = 75,
place = {United States},
year = {2007},
month = {1}
}