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Nanoscale magnetic and charge anisotropies at manganite interfaces

机译：锰铁界面的纳米级磁性和电荷各向同性

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Strong correlated manganites are still under intense research owing to their complex phase diagrams in terms of Sr-doping and their sensitivity to intrinsic and extrinsic structural deformations. Here, we performed X-ray absorption spectroscopy measurements of manganite bilayers to explore the effects that a local Sr-doping gradient produce on the charge and antiferromagnetic anisotropies. In order to gradually tune the Sr-doping level along the axis perpendicular to the samples we have grown a series of bilayers with different thicknesses of low-doped manganites (from 0 nm to 6 nm) deposited over a La0.7Sr0.3MnO3 metallic layer. This strategy permitted us to resolve with high accuracy the thickness region where the charge and spin anisotropies vary and the critical thickness t(c) over which the out of plane orbital asymmetry does not have any further modifications. We found that the antiferromagnetic spin axis points preferentially out of the sample plane regardless the capping layer thickness. However, it tilts partially into the sample plane far from this critical thickness, owing to the combined contributions of the external structural strain and electron doping. Furthermore, we found that the doping level of the capping layer strongly affects the critical thickness, giving clear evidence of the influence exerted by the electron doping on the orbital and magnetic configurations. These anisotropic changes induce subtle modifications on the domain reorientation of La0.7Sr0.3MnO3, as evidenced from the magnetic hysteresis cycles.
机译：由于SR掺杂方面的复杂相图及其对内在结构变形的敏感性，强烈相关锰矿体仍处于激烈的研究。在这里，我们对锰铁双层进行了X射线吸收光谱测量，以探讨局部SR掺杂梯度产生对电荷和反铁磁各向异性的影响。为了逐渐沿着垂直于样品的轴线旋转SR掺杂水平，我们已经生长了一系列具有不同厚度的双层的双层（从0nm至6nm）沉积在La0.7sr0.3mNO3金属层上。该策略允许我们利用高精度来解决电荷和旋转各向异性的厚度区域而变化和临界厚度T（c），在该颈轨道不对称中没有任何进一步的修改。我们发现，无论覆盖层厚度如何，反式磁性旋转轴优先从样品平面出来。然而，由于外部结构应变应变和电子掺杂的组合贡献，它倾斜地分离到远离该临界厚度的样品平面中。此外，我们发现覆盖层的掺杂水平强烈影响临界厚度，从而清楚地证明通过电子掺杂在轨道和磁性配置上施加的影响。这些各向异性变化对La0.7sr0.3mnO3的域重新定向进行了微妙的修改，如磁滞循环所证明的那样。

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    《RSC Advances》 |2019年第66期|共8页
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  • 正文语种 eng
  • 中图分类 化学;
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