A1 Refereed original research article in a scientific journal
Microstructural studies of La(0.7)Ca(0.3)MnO(3) (LCMO) films on different (110) substrates deposited by pulsed laser deposition
Authors: Tse YY, Chakalov RI, Jones IP, Muirhead CM, Huhtinen H, Palai R
Publication year: 2008
Journal:: Journal of Physics: Conference Series
Journal name in source: EMAG: ELECTRON MICROSCOPY AND ANALYSIS GROUP CONFERENCE 2007
Journal acronym: J PHYS CONF SER
Article number: ARTN 012051
Volume: 126
Number of pages: 4
ISBN: *****************
ISSN: 1742-6588
DOI: https://doi.org/10.1088/1742-6596/126/1/012051
Abstract
La(0.7)Ca(0.3)MnO(3) (LCMO) films grown on (110) surfaces of various (pseudo-) cubic substrates, SrTiO(3) (STO), LaAlO(3) (LAO) and La(0.3)R(0.7)Al(0.5)Ta(0.35)O(3) (LSAT), were studied by means of transmission electron microscopy (TEM). (110) LSAT substrate and LCMO film have the smallest lattice mismatch. (110) LAO substrate induces compressive strain while (110) STO induces tensile strain in the LCMO film. In all cases, the (010)(o) plane (long axis) of LCMO is parallel to the substrate surface. In the case of LSAT, the [001](o) is parallel to [011] LSAT while the films on the other 2 substrates have [100](o). // to the [011] substrates. Films grown on STO and LAO show an easy magnetisation when the applied magnetic field is in plane along the long-axis of the LCMO. In the case of LSAT, there is no in-plane anisotropy. The films on STO and LAO have twins as the dominant defects. The film on LSAT has less twinning. High resolution TEM shows that LCMO on (110) LSAT (the least lattice mismatch) possesses a perfect interface with no misfit dislocations in the area of examination. The LCMO films on (110) LAO and (110) STO have nearly perfect interfaces with atomic sharpness but with misfit dislocations. The different in-plane crystal directions and strain distributions in the films may account for the different magnetisation behaviours of the LCMO films on the different (011) substrates.
La(0.7)Ca(0.3)MnO(3) (LCMO) films grown on (110) surfaces of various (pseudo-) cubic substrates, SrTiO(3) (STO), LaAlO(3) (LAO) and La(0.3)R(0.7)Al(0.5)Ta(0.35)O(3) (LSAT), were studied by means of transmission electron microscopy (TEM). (110) LSAT substrate and LCMO film have the smallest lattice mismatch. (110) LAO substrate induces compressive strain while (110) STO induces tensile strain in the LCMO film. In all cases, the (010)(o) plane (long axis) of LCMO is parallel to the substrate surface. In the case of LSAT, the [001](o) is parallel to [011] LSAT while the films on the other 2 substrates have [100](o). // to the [011] substrates. Films grown on STO and LAO show an easy magnetisation when the applied magnetic field is in plane along the long-axis of the LCMO. In the case of LSAT, there is no in-plane anisotropy. The films on STO and LAO have twins as the dominant defects. The film on LSAT has less twinning. High resolution TEM shows that LCMO on (110) LSAT (the least lattice mismatch) possesses a perfect interface with no misfit dislocations in the area of examination. The LCMO films on (110) LAO and (110) STO have nearly perfect interfaces with atomic sharpness but with misfit dislocations. The different in-plane crystal directions and strain distributions in the films may account for the different magnetisation behaviours of the LCMO films on the different (011) substrates.
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