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用于功能特性的外延钙钛矿薄膜铁电-铁磁界面的原子尺度工程。

Atomic-scale engineering of ferroelectric-ferromagnetic interfaces of epitaxial perovskite films for functional properties.

机构信息

Technische Universität München, Physik-Department, Lehrstuhl für Neutronenstreuung, James-Franck-Strasse 1, D-85748, Garching, Germany.

Irvine Materials Research Institute, University of California-Irvine, Irvine, CA, 92697-2800, USA.

出版信息

Sci Rep. 2017 Sep 6;7(1):10734. doi: 10.1038/s41598-017-10194-4.

DOI:10.1038/s41598-017-10194-4
PMID:28878313
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5587576/
Abstract

Besides epitaxial mismatch that can be accommodated by lattice distortions and/or octahedral rotations, ferroelectric-ferromagnetic interfaces are affected by symmetry mismatch and subsequent magnetic ordering. Here, we have investigated La Sr MnO (LSMO) samples with varying underlying unit cells (uc) of BaTiO (BTO) layer on (001) and (110) oriented substrates in order to elucidate the role of symmetry mismatch. Lattice mismatch for 3 uc of BTO and symmetry mismatch for 10 uc of BTO, both associated with local MnO octahedral distortions of the (001) LSMO within the first few uc, are revealed by scanning transmission electron microscopy. Interestingly, we find exchange bias along the in-plane [110]/[100] directions only for the (001) oriented samples. Polarized neutron reflectivity measurements confirm the existence of a layer with zero net moment only within (001) oriented samples. First principle density functional calculations show that even though the bulk ground state of LSMO is ferromagnetic, a large lattice constant together with an excess of La can stabilize an antiferromagnetic LaMnO-type phase at the interface region and explain the experimentally observed exchange bias. Atomic scale tuning of MnO octahedra can thus be made possible via symmetry mismatch at heteroepitaxial interfaces. This aspect can act as a vital parameter for structure-driven control of physical properties.

摘要

除了可以通过晶格畸变和/或八面体旋转来适应的外延失配之外，铁电-铁磁界面还受到对称性失配和随后的磁序的影响。在这里，我们研究了在（001）和（110）取向衬底上具有不同底层单位晶胞（uc）的 BaTiO（BTO）层的 LaSrMnO（LSMO）样品，以阐明对称性失配的作用。通过扫描透射电子显微镜揭示了 3uc 的 BTO 的晶格失配和 10uc 的 BTO 的对称性失配，这两者都与（001）LSMO 内的第一个几个 uc 的局部 MnO 八面体畸变有关。有趣的是，我们发现仅在（001）取向的样品中存在沿面内[110]/[100]方向的交换偏置。极化中子反射率测量证实了仅在（001）取向的样品中存在具有零净矩的层。第一性原理密度泛函计算表明，尽管 LSMO 的体相基态是铁磁的，但较大的晶格常数和过量的 La 可以在界面区域稳定反铁磁 LaMnO 型相，并解释实验观察到的交换偏置。因此，可以通过异质外延界面的对称性失配来实现 MnO 八面体的原子尺度调谐。这个方面可以作为结构驱动控制物理性质的重要参数。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/babf/5587576/73bb52b36b6b/41598_2017_10194_Fig10_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/babf/5587576/be0191683dcf/41598_2017_10194_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/babf/5587576/7ba62373d3cd/41598_2017_10194_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/babf/5587576/73bb52b36b6b/41598_2017_10194_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/babf/5587576/2456d4cb23b1/41598_2017_10194_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/babf/5587576/23ad19129623/41598_2017_10194_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/babf/5587576/f4cb566dcc32/41598_2017_10194_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/babf/5587576/996447864bbe/41598_2017_10194_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/babf/5587576/ebff5ab7c464/41598_2017_10194_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/babf/5587576/d7a243f919eb/41598_2017_10194_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/babf/5587576/245f81c94cfb/41598_2017_10194_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/babf/5587576/be0191683dcf/41598_2017_10194_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/babf/5587576/7ba62373d3cd/41598_2017_10194_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/babf/5587576/73bb52b36b6b/41598_2017_10194_Fig10_HTML.jpg

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