Cross-sectional TEM was carried out to understand the effects of microstructure on the physical properties of manganite films on different (011) substrates. La_0.7Ca_0.3MnO₃ (LCMO) films have been grown on (011) surfaces of various (pseudo-) cubic substrates, SrTiO₃ (STO), LaAlO₃ (LAO) and La_0.3Sr_0.7Al_0.5Ta_0.35O₃ (LSAT) by pulsed laser deposition. (011) LSAT substrate and LCMO film have the smallest lattice mismatch, but, (011) LAO substrate induces compressive strain while (011) STO induces tensile strain to the LCMO films. Two different epitaxial relationships have been observed in three different substrates. On LSAT substrate, [001]o of LCMO is parallel to the [011] LSAT while the LCMO films show a [100]o // [011] relationship on STO and LAO substrates. LCMO films on STO and LSAT show the single orientation variant with twins as the dominant defects. LCOM film on LAO substrate shows at least 3 variants and with twins. High resolution TEM reveals that LCMO on LSAT possesses a perfect interface and has no misfit dislocations in the area of examination. LCMO films on (110) LAO and (110) STO, have interfaces with atomic sharpness while misfit dislocations can be identified. Films grown on STO and LAO have an easy magnetization direction when the applied magnetic field is in plane along the long-axis of LCMO. In the case of LSAT, there is no in-plane anisotropy. The different in-plane crystal direction and strain distributions in the film may account for the different magnetisation behaviours of the LCMO films on different (011) substrates.

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