Preparation of a heteroepitaxial LaxSryMn zO3/BiFeO3 bilayer by r.f. magnetron sputtering with various oxygen gas flow ratios

H. Naganuma; T. Ichinose; H. A. Begum; S. Sato; X. F. Han; T. Miyazaki; In T. Bae; M. Oogane; Y. Ando

doi:10.1063/1.4893998

Preparation of a heteroepitaxial La_xSr_yMn _zO₃/BiFeO₃ bilayer by r.f. magnetron sputtering with various oxygen gas flow ratios

H. Naganuma, T. Ichinose, H. A. Begum, S. Sato, X. F. Han, T. Miyazaki, In T. Bae, M. Oogane, Y. Ando

ENG - Applied Physics

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2 Citations (Scopus)

Abstract

BiFeO₃ (BFO) and La_xSr_yMn _zO₃ (LSMO) films were epitaxially grown on SrTiO ₃ (100) substrates by r.f. magnetron sputtering with various oxygen gas flow ratios (F_O2). Compositional ratios of each atom in both of BFO and LSMO could be controlled kept to around 10 at.% by changing F _O2. Adjusting the compositional ratio to La_0.35Sr _0.15Mn_0.5O₃ not only increase T_c of LSMO but also produces sufficient oxygen to form a perovskite lattice. For an LSMO/BFO heterostructure, detailed observation by cross sectional transmission electron microscopy (TEM) revealed that the lattice of rhombohedral (SG: R-3c) LSMO was shrank by a clamping effect from the SrTiO₃ substrates, and then the BFO was grown in two layers: (i) an interfacial BFO layer (7 nm thick) with evenly shrunk a-axis and c-axis, and (ii) an upper BFO layer (25 nm thick) expanded along the c-axis. Neither misfit strain nor dislocations appeared at the interface between the shrunken BFO and LSMO layers, and these heterostructures did not show exchange bias. These results suggest that BFO is suitable for a tunneling barrier combine with LSMO electrode.

Original language	English
Article number	087133
Journal	AIP Advances
Volume	4
Issue number	8
DOIs	https://doi.org/10.1063/1.4893998
Publication status	Published - 2014 Aug

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Preparation of a heteroepitaxial LaxSryMn zO3/BiFeO3 bilayer by r.f. magnetron sputtering with various oxygen gas flow ratios",

abstract = "BiFeO3 (BFO) and LaxSryMn zO3 (LSMO) films were epitaxially grown on SrTiO 3 (100) substrates by r.f. magnetron sputtering with various oxygen gas flow ratios (FO2). Compositional ratios of each atom in both of BFO and LSMO could be controlled kept to around 10 at.% by changing F O2. Adjusting the compositional ratio to La0.35Sr 0.15Mn0.5O3 not only increase Tc of LSMO but also produces sufficient oxygen to form a perovskite lattice. For an LSMO/BFO heterostructure, detailed observation by cross sectional transmission electron microscopy (TEM) revealed that the lattice of rhombohedral (SG: R-3c) LSMO was shrank by a clamping effect from the SrTiO3 substrates, and then the BFO was grown in two layers: (i) an interfacial BFO layer (7 nm thick) with evenly shrunk a-axis and c-axis, and (ii) an upper BFO layer (25 nm thick) expanded along the c-axis. Neither misfit strain nor dislocations appeared at the interface between the shrunken BFO and LSMO layers, and these heterostructures did not show exchange bias. These results suggest that BFO is suitable for a tunneling barrier combine with LSMO electrode.",

author = "H. Naganuma and T. Ichinose and Begum, {H. A.} and S. Sato and Han, {X. F.} and T. Miyazaki and Bae, {In T.} and M. Oogane and Y. Ando",

year = "2014",

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doi = "10.1063/1.4893998",

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T1 - Preparation of a heteroepitaxial LaxSryMn zO3/BiFeO3 bilayer by r.f. magnetron sputtering with various oxygen gas flow ratios

AU - Naganuma, H.

AU - Ichinose, T.

AU - Begum, H. A.

AU - Sato, S.

AU - Han, X. F.

AU - Miyazaki, T.

AU - Bae, In T.

AU - Oogane, M.

AU - Ando, Y.

PY - 2014/8

Y1 - 2014/8

N2 - BiFeO3 (BFO) and LaxSryMn zO3 (LSMO) films were epitaxially grown on SrTiO 3 (100) substrates by r.f. magnetron sputtering with various oxygen gas flow ratios (FO2). Compositional ratios of each atom in both of BFO and LSMO could be controlled kept to around 10 at.% by changing F O2. Adjusting the compositional ratio to La0.35Sr 0.15Mn0.5O3 not only increase Tc of LSMO but also produces sufficient oxygen to form a perovskite lattice. For an LSMO/BFO heterostructure, detailed observation by cross sectional transmission electron microscopy (TEM) revealed that the lattice of rhombohedral (SG: R-3c) LSMO was shrank by a clamping effect from the SrTiO3 substrates, and then the BFO was grown in two layers: (i) an interfacial BFO layer (7 nm thick) with evenly shrunk a-axis and c-axis, and (ii) an upper BFO layer (25 nm thick) expanded along the c-axis. Neither misfit strain nor dislocations appeared at the interface between the shrunken BFO and LSMO layers, and these heterostructures did not show exchange bias. These results suggest that BFO is suitable for a tunneling barrier combine with LSMO electrode.

AB - BiFeO3 (BFO) and LaxSryMn zO3 (LSMO) films were epitaxially grown on SrTiO 3 (100) substrates by r.f. magnetron sputtering with various oxygen gas flow ratios (FO2). Compositional ratios of each atom in both of BFO and LSMO could be controlled kept to around 10 at.% by changing F O2. Adjusting the compositional ratio to La0.35Sr 0.15Mn0.5O3 not only increase Tc of LSMO but also produces sufficient oxygen to form a perovskite lattice. For an LSMO/BFO heterostructure, detailed observation by cross sectional transmission electron microscopy (TEM) revealed that the lattice of rhombohedral (SG: R-3c) LSMO was shrank by a clamping effect from the SrTiO3 substrates, and then the BFO was grown in two layers: (i) an interfacial BFO layer (7 nm thick) with evenly shrunk a-axis and c-axis, and (ii) an upper BFO layer (25 nm thick) expanded along the c-axis. Neither misfit strain nor dislocations appeared at the interface between the shrunken BFO and LSMO layers, and these heterostructures did not show exchange bias. These results suggest that BFO is suitable for a tunneling barrier combine with LSMO electrode.

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Preparation of a heteroepitaxial La_xSr_yMn _zO₃/BiFeO₃ bilayer by r.f. magnetron sputtering with various oxygen gas flow ratios

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