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首页> 外文期刊>Journal of Applied Physics >Influence of microstructure and interfacial strain on the magnetic properties of epitaxial Mn_3O_4/La_(0.7)Sr_(0.3)MnO_3 layered-composite thin films
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Influence of microstructure and interfacial strain on the magnetic properties of epitaxial Mn_3O_4/La_(0.7)Sr_(0.3)MnO_3 layered-composite thin films

机译：显微组织和界面应变对外延Mn_3O_4 / La_（0.7）Sr_（0.3）MnO_3层状复合薄膜磁性能的影响

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摘要

79%Epitaxial Mn_3O_4/La_(0.7)Sr_(0.3)MnO_3(Mn_3O_4/LSMO) bilayer thin films were grown on lattice-matched single crystal substrates of SrTiO_3 (STO) (100) and MgO (100), with Mn_3O_4as the top layer, using a pulsed laser deposition technique. X-ray diffraction (XRD) patterns revealed the single crystalline nature and epitaxial relationship between the layers. A detailed analysis of strains using XRD asymmetric/symmetric scans indicated an increasing in-plane compressive strain in the LSMO layer with increasing thicknesses of the Mn_3O_4layer, resulting in a tetragonal distortion of the LSMO lattice in the Mn_3O_4/LSMO films in comparison to the tensile strains in LSMO single-layer films grown on both STO and MgO substrates. Cross-sectional high resolution transmission electron microscope (HRTEM) images showed atomically sharp interfaces in all films. However, as opposed to a flat interface between LSMO and STO, the Mn_3O_4 and LSMO interface was undulating and irregular in the bilayer films. Magnetic measurements revealed that relative to LSMO, the presence of Mn_3O_4 in Mn_3O_4/LSMO reduced the saturation magnetization at T > 50 K (the ferrimagnetic ordering temperature of Mn_3O_4) but enhanced it at T < 50 K. The decrease of the saturation magnetization in Mn_3O_4/LSMO for T > 50 K was associated with the appearance and increase of the compressive strain with the increase in Mn_3O_4 thickness. These observations point to the importance of a ferromagnetic-ferrimagnetic interfacial coupling between the LSMO and Mn_3O_4 layers in enhancing the surface magnetism of LSMO in the Mn_3O_4/LSMO bilayers. Our study provides useful information regarding the development of manganite composite thin films with improved magnetic properties for a wide range of technological applications, such as in spintronics and sensor devices.
机译：在SrTiO_3（STO）（100）和MgO（100）的晶格匹配单晶衬底上生长79％外延Mn_3O_4 / La_（0.7）Sr_（0.3）MnO_3（Mn_3O_4 / LSMO）双层薄膜，以Mn_3O_4为顶层，使用脉冲激光沉积技术。 X射线衍射（XRD）模式揭示了层之间的单晶性质和外延关系。使用XRD不对称/对称扫描对应变进行的详细分析表明，随着Mn_3O_4层厚度的增加，LSMO层中的面内压缩应变增加，导致Mn_3O_4 / LSMO膜中LSMO晶格的四方形变形与拉伸强度相比有所增加。在STO和MgO衬底上生长的LSMO单层膜中的菌株。截面高分辨率透射电子显微镜（HRTEM）图像显示了所有薄膜的原子清晰界面。但是，与LSMO和STO之间的平面界面相反，双层膜中Mn_3O_4和LSMO界面呈波状且不规则。磁性测量表明，相对于LSMO，Mn_3O_4 / LSMO中Mn_3O_4的存在降低了T> 50 K时的饱和磁化强度（Mn_3O_4的亚铁磁有序温度），但在T <50 K时增强了饱和磁化强度。Mn_3O_4中饱和磁化强度的降低T> 50 K的/ LSMO与Mn_3O_4厚度的增加和压缩应变的增加有关。这些观察结果表明，LSMO和Mn_3O_4层之间的铁磁-铁磁界面耦合对于增强Mn_3O_4 / LSMO双层中LSMO的表面磁性很重要。我们的研究提供了有关开发用于多种技术应用（如自旋电子学和传感器设备）的具有改善的磁性能的锰铁矿复合薄膜的有用信息。

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  • 来源
    《Journal of Applied Physics》 |2012年第8期|083910.1-083910.8|共8页
  • 作者

    Devajyoti Mukherjee; Nicholas Bingham; Mahesh Hordagoda; Manh-Huong Phan; Hariharan Srikanth; Sarath Witanachchi; Pritish Mukherjee;

  • 作者单位

    Department of Physics and Center for Integrated Functional Materials (CIFM), University of South Florida, Tampa, Florida 33620, USA;

    Department of Physics and Center for Integrated Functional Materials (CIFM), University of South Florida, Tampa, Florida 33620, USA;

    Department of Physics and Center for Integrated Functional Materials (CIFM), University of South Florida, Tampa, Florida 33620, USA;

    Department of Physics and Center for Integrated Functional Materials (CIFM), University of South Florida, Tampa, Florida 33620, USA;

    Department of Physics and Center for Integrated Functional Materials (CIFM), University of South Florida, Tampa, Florida 33620, USA;

    Department of Physics and Center for Integrated Functional Materials (CIFM), University of South Florida, Tampa, Florida 33620, USA;

    Department of Physics and Center for Integrated Functional Materials (CIFM), University of South Florida, Tampa, Florida 33620, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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