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Exchange coupling-induced uniaxial anisotropy in La0.7Sr0.3MnO3 thin films

  • Article
  • Materials Science
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Science Bulletin

Abstract

Establishing a deeper understanding of the anisotropy in manganites is useful for tailoring their magnetic properties for device applications. Here we showed that ferromagnetic La0.7Sr0.3MnO3 (LSMO) thin films, epitaxially grown on SrTiO3 (STO) substrates, exhibited unexpected double-shifted magnetization curves originating from the competition between common biaxial and emergent uniaxial anisotropies. This emergent uniaxial anisotropy could be induced by exchange coupling between the ferromagnetic LSMO and an antiferromagnetic LSMO dead layer at the LSMO/STO interface, which could be manipulated by the degree of oxygen deficiency.

摘要

特定成分的镧锶锰氧薄膜具有室温铁磁性和几乎100%的自旋极化率,这一特性使该材料在磁记录等相关领域具有极大的应用前景,是近年来磁电子学的研究热点之一。镧锶锰氧薄膜的性能,尤其是磁性能,受到成分、缺陷、应变界面等多种因素的影响,同时也是1个很好的研究模型。本文通过脉冲激光沉积的方法,在(100)取向的单晶钛酸锶基片上生长了高质量的镧锶锰氧薄膜,通过磁光克尔效应测试仪研究了该薄膜的磁各向异性。结果发现,该薄膜具有单轴磁各向异性,且在其难轴方向,出现了磁双滞回线。结合微磁学模型,提出该单轴各向异性是界面死层诱导产生的。通过氧气氛退火工艺调控薄膜中氧空位的浓度,可以改变薄膜的磁各向异性。本研究有助于更深入地理解镧锶锰氧薄膜的磁性及其异质结的界面死层。

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (51332001 and 51402164) and Tsinghua University Initiative Scientific Research Program (2014Z21010 and 2014Z01006).

Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China

    Liang Wu, Jing Ma, Ji Ma, Yujun Zhang, Ya Gao, Qinghua Zhang & Ce-Wen Nan

  2. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education and International Center for Dielectric Research, Xi’an Jiaotong University, Xi’an, 710049, China

    Ming Liu

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  1. Liang Wu
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  2. Jing Ma
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  3. Ji Ma
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  6. Qinghua Zhang
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  7. Ming Liu
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Correspondence to Jing Ma.

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Wu, L., Ma, J., Ma, J. et al. Exchange coupling-induced uniaxial anisotropy in La0.7Sr0.3MnO3 thin films. Sci. Bull. 61, 157–162 (2016). https://doi.org/10.1007/s11434-015-0962-1

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  • DOI: https://doi.org/10.1007/s11434-015-0962-1

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