Effect of Terraces at the Interface on the Structural and Physical Properties of La_0.8Sr_0.2MnO_3 Thin Films
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Ya-Qing Feng,
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Kui-Juan Jin,
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Chen Ge,
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Xu He,
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Lin Gu,
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Zhen-Zhong Yang,
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Hai-Zhong Guo,
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Qian Wan,
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Meng He,
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Hui-Bin Lu,
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Guo-Zhen Yang
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Abstract
Employing atomic force microscopy, transmission electron microscopy and the second harmonic generation technique, we carefully explore the structural properties of 6-unit-cell-thick La_0.8Sr_0.2MnO_3 films grown on SrTiO_3 with atomically flat TiO_2-terminated terraces on the surface. The results clearly demonstrate that the terraces on the surface of TiO_2-terminated SrTiO_3 can improve the layer-by-layer epitaxial growth of the manganite films, which results in uniform film coverage at the beginning of growth and thus reduces the substrate-induced disorder at or near the interface. Comparing the magnetic and transport properties of La_0.8Sr_0.2MnO_3 films with the thicknesses varying from 6 unit cells to 80 unit cells grown respectively on as-received SrTiO_3 and TiO_2-terminated SrTiO_3, it is found that these atomically flat terraces on the surface of TiO_2-terminated SrTiO_3 can greatly enhance the Curie temperature and conductivities of the ultrathin La_0.8Sr_0.2MnO_3 films with thickness less than 50 unit cells, while no obvious difference is detected in the magnetic and transport properties of the 80 unit-cell thick films.
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Ya-Qing Feng, Kui-Juan Jin, Chen Ge, Xu He, Lin Gu, Zhen-Zhong Yang, Hai-Zhong Guo, Qian Wan, Meng He, Hui-Bin Lu, Guo-Zhen Yang. Effect of Terraces at the Interface on the Structural and Physical Properties of La$_{0.8}$Sr$_{0.2}$MnO$_{3}$ Thin Films[J]. Chin. Phys. Lett., 2016, 33(7): 076801. DOI: 10.1088/0256-307X/33/7/076801
Ya-Qing Feng, Kui-Juan Jin, Chen Ge, Xu He, Lin Gu, Zhen-Zhong Yang, Hai-Zhong Guo, Qian Wan, Meng He, Hui-Bin Lu, Guo-Zhen Yang. Effect of Terraces at the Interface on the Structural and Physical Properties of La$_{0.8}$Sr$_{0.2}$MnO$_{3}$ Thin Films[J]. Chin. Phys. Lett., 2016, 33(7): 076801. DOI: 10.1088/0256-307X/33/7/076801
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Ya-Qing Feng, Kui-Juan Jin, Chen Ge, Xu He, Lin Gu, Zhen-Zhong Yang, Hai-Zhong Guo, Qian Wan, Meng He, Hui-Bin Lu, Guo-Zhen Yang. Effect of Terraces at the Interface on the Structural and Physical Properties of La$_{0.8}$Sr$_{0.2}$MnO$_{3}$ Thin Films[J]. Chin. Phys. Lett., 2016, 33(7): 076801. DOI: 10.1088/0256-307X/33/7/076801
Ya-Qing Feng, Kui-Juan Jin, Chen Ge, Xu He, Lin Gu, Zhen-Zhong Yang, Hai-Zhong Guo, Qian Wan, Meng He, Hui-Bin Lu, Guo-Zhen Yang. Effect of Terraces at the Interface on the Structural and Physical Properties of La$_{0.8}$Sr$_{0.2}$MnO$_{3}$ Thin Films[J]. Chin. Phys. Lett., 2016, 33(7): 076801. DOI: 10.1088/0256-307X/33/7/076801
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