Effect of annealing on Curie temperature and phase transition in La0.55Sr0.08Mn0.37O3 epitaxial films grown on SrTiO3 (100) substrates by reactive radio frequency magnetron sputtering
Effect of annealing on Curie temperature and phase transition in La0.55Sr0.08Mn0.37O3 epitaxial films grown on SrTiO3 (100) substrates by reactive radio frequency magnetron sputtering
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DOI：
10.1016/j.matchar.2016.05.002
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发表时间：
2016-08
影响因子：
4.7
通讯作者：
T. Ichinose;H. Naganuma;T. Miyazaki;M. Oogane;Y. Ando;T. Ueno;N. Inami;K. Ono
中科院分区：
文献类型：
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作者：
T. Ichinose;H. Naganuma;T. Miyazaki;M. Oogane;Y. Ando;T. Ueno;N. Inami;K. Ono
在氩气和氧气混合气体中，通过射频磁控溅射在 SrTiO3(100) 衬底上生长贫锰 LaSrMnO3(LSMO) 外延薄膜，然后将样品在不同温度 (Ta) 的空气中退火。 2 theta-chi X射线衍射图、通过透射电子显微镜进行的纳米束衍射分析以及通过扫描电子显微镜进行的电子背散射衍射表明，在空气中退火时，LSMO薄膜的晶体对称性从单斜/斜方晶系转变为菱形晶系。 LSMO薄膜的居里温度（TC）随着Ta的增加而增加，并且在Ta≥ 861 °C时变得高于室温，表明这些变化的原因是氧的填充和晶体对称性向菱面体的转变。
Mn-poor LaSrMnO3(LSMO) epitaxial films were grown on SrTiO3(100) substrates by radio frequency magnetron sputtering in an argon and oxygen gas mix, and then the samples were annealed in air at various temperatures (Ta). 2 theta-chi X-ray diffraction mapping, nano-beam diffraction analysis through transmission electron microscopy, and electron back scatter diffraction through scanning electron microscopy revealed that the crystal symmetry of the LSMO films changed from monoclinic/orthorhombic to rhombohedral on annealing in air. Curie temperature (TC) of the LSMO films was found to increase with increasingTa, and become higher than the room temperature atTa≥ 861 °C, indicating that the cause of these changes was the filling of oxygen and the transition of the crystal symmetry into rhombohedral.