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材料导报  2022, Vol. 36 Issue (19): 21020016-6    https://doi.org/10.11896/cldb.21020016
  无机非金属及其复合材料 |
应力与取向调控超薄La0.7Sr0.3MnO3薄膜各向异性的研究
周国伟, 李枝兰, 王晓娇
山西师范大学材料科学研究院,磁性分子与磁信息材料教育部重点实验室,太原 030006
Strain and Orientation Manipulation of Magnetic Anisotropy in Ultrathin La0.7Sr0.3MnO3 Films
ZHOU Guowei, LI Zhilan, WANG Xiaojiao
Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, Research Institute of Materials Science, Shanxi Normal University, Taiyuan 030006, China
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摘要 本工作采用带有原位反射式高能电子衍射(RHEED)的脉冲激光沉积系统,分别在(001)和(110)两种取向的SrTiO3、(LaSr)(AlTa)O3、LaAlO3三种衬底上沉积厚度为13个晶胞(unit cell,u.c.)的高质量超薄La0.7Sr0.3MnO3(LSMO)薄膜。首先,采用原子力显微镜(AFM)对薄膜表面形貌进行表征;其次,通过综合物性测量系统(PPMS)对薄膜磁各向异性变化进行表征;最后,利用同步辐射软X射线吸收谱技术研究薄膜中锰的轨道占据状态。综合研究发现,无论LSMO薄膜沉积在哪一种取向的衬底上,受拉应力作用的电子均优先占据面内轨道,LSMO薄膜表现出面内易磁化特性;而受压应力作用的电子则优先占据面外轨道,LSMO薄膜表现为垂直磁各向异性。
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周国伟
李枝兰
王晓娇
关键词:  脉冲激光沉积系统  应力与取向  超薄LSMO薄膜  各向异性  轨道占据    
Abstract: The pulsed laser deposition system equipped with in-situ reflection high-energy electron diffraction (RHEED) was used in this work. The LSMO films (13 u.c.) were deposited on three different substrates (SrTiO3, (LaSr)(AlTa)O3, LaAlO3) with two crystalline orientations (001) and (110). The atomic force microscopy (AFM) was used to characterize the film surface morphology and roughness. The magnetic anisotropy was measured by the physical properties measurement system (PPMS). The orbital occupation of Mn ions in the LSMO film was proved by the X-ray absorption spectroscopy. In summary, no matter what substrates with orientations the LSMO films are deposited on, the electrons of Mn ions preferentially occupy the in-plane orbital and the LSMO films display the in-plane magnetic easy axis under tensile strain. In contrary, the electrons of Mn ions preferentially occupy the out-of-plane orbital and the LSMO films exhibit the out-of-plane magnetic anisotropy under compressive strain.
Key words:  pulsed laser deposition system    strain and orientation    ultrathin LSMO films    anisotropy    orbital occupation
出版日期:  2022-10-10      发布日期:  2022-10-12
ZTFLH:  O469  
  O441  
  O46  
  O47  
基金资助: 国家自然科学基金(51901118);山西师范大学研究生科技创新项目(2021XSY036)
通讯作者:  zhougw@sxnu.edu.cn   
作者简介:  周国伟,山西师范大学化学与材料科学学院副教授、硕士研究生导师。2012年山西农业大学资源与环境学院环境科学专业本科毕业,2014年山西师范大学化学与材料科学学院材料工程专业硕士毕业,2018年山西师范大学化学与材料科学学院化学专业博士毕业后留在山西师范大学工作至今。2019年1月至2019年12月在新加坡国立大学材料与科学工程专业访学一年。目前主要从事钙钛矿复杂氧化物薄膜和异质结中新奇物理现象的研究工作。发表论文30余篇,包括Materials Horizons、ACS Applied Materials & Interfaces、Physical Review B、Applied Physics Letters等。
引用本文:    
周国伟, 李枝兰, 王晓娇. 应力与取向调控超薄La0.7Sr0.3MnO3薄膜各向异性的研究[J]. 材料导报, 2022, 36(19): 21020016-6.
ZHOU Guowei, LI Zhilan, WANG Xiaojiao. Strain and Orientation Manipulation of Magnetic Anisotropy in Ultrathin La0.7Sr0.3MnO3 Films. Materials Reports, 2022, 36(19): 21020016-6.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.21020016  或          http://www.mater-rep.com/CN/Y2022/V36/I19/21020016
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