Chin. Phys. Lett.  2019, Vol. 36 Issue (4): 046102    DOI: 10.1088/0256-307X/36/4/046102
CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
Strain Induced Nanopillars and Variation of Magnetic Properties in La$_{0.825}$Sr$_{0.175}$MnO$_{3}$/LaAlO$_{3}$ Films
Xin Li1, Jing-Zhi Han1**, Xiong-Zuo Zhang1, Yin-Feng Zhang1, Hai-Dong Tian1, Ming-Zhu Xue1, Kun Li1, Xin Wen1, Wen-Yun Yang1, Shun-Quan Liu1, Chang-Sheng Wang1, Hong-Lin Du1, Xiao-Dong Zhang1, Xin-An Wang3, Ying-Chang Yang1, Jin-Bo Yang1,2
1State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871
2Beijing Key Laboratory for Magnetoelectric Materials and Devices, Beijing 100871
3Ningxia Magvalley Novel Materials Technology Co., Ltd. New Energy Sub-Park, Ningdong Energy & Chemical Industry Base, Ningxia 751411
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Xin Li, Jing-Zhi Han, Xiong-Zuo Zhang et al  2019 Chin. Phys. Lett. 36 046102
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Abstract To investigate the process of strain relaxation and resultant variation of microstructure and magnetic properties, low-doped La$_{0.825}$Sr$_{0.175}$MnO$_{3}$ epitaxial films with different thicknesses are deposited on LaAlO$_{3}$ substrates and strain induced nanopillars are discovered inside the La$_{0.825}$Sr$_{0.175}$MnO$_{3}$ film. Perpendicular oriented nanopillars mainly exist below 30 nm and tend to disappear above 30 nm. The distribution of nanopillars not only induce the variation of lattice parameters and local structural distortion but also lead to the deviation of easy magnetization axis from the perpendicular direction. Specifically, the out-of-plane lattice parameters of the film decrease quickly with the increase of the thickness but tend to be constant when the thickness is above 30 nm. Meanwhile, the variations of magnetic properties along in-plane and out-of-plane directions would also decline at first and they then remain nearly unchanged. Our work constructs the relationship between nanopillars and magnetic properties inside films. We are able to clearly reveal the effects of inhomogeneous strain relaxation.
Received: 07 January 2019      Published: 23 March 2019
PACS:  61.05.-a (Techniques for structure determination)  
  61.05.cp (X-ray diffraction)  
  74.78.Na (Mesoscopic and nanoscale systems)  
  75.47.Lx (Magnetic oxides)  
Fund: Supported by the National Key Research and Development Program of China under Grant Nos 2017YFA206303 and 2016YFB0700901, and the National Natural Science Foundation of China under Grant Nos 51731001, 51371009 and 51271004.
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https://cpl.iphy.ac.cn/10.1088/0256-307X/36/4/046102       OR      https://cpl.iphy.ac.cn/Y2019/V36/I4/046102
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Xin Li
Jing-Zhi Han
Xiong-Zuo Zhang
Yin-Feng Zhang
Hai-Dong Tian
Ming-Zhu Xue
Kun Li
Xin Wen
Wen-Yun Yang
Shun-Quan Liu
Chang-Sheng Wang
Hong-Lin Du
Xiao-Dong Zhang
Xin-An Wang
Ying-Chang Yang
Jin-Bo Yang
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