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首页> 外文期刊>Crystal growth & design >Ferromagnetic Epitaxial mu-Fe2O3 on beta-Ga2O3 : A New Monoclinic Form of Fe2O3
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Ferromagnetic Epitaxial mu-Fe2O3 on beta-Ga2O3 : A New Monoclinic Form of Fe2O3

机译：Beta-Ga2O3上的铁磁性外延MU2O3：Fe2O3的新单斜形式

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摘要

Here we demonstrate a new monoclinic iron oxide phase (mu-Fe2O3), epitaxially stabilized by growth on (010) beta-Ga2O3. Density functional theory (DFT) calculations find that the lattice parameters of freestanding mu-Fe2O3 are within similar to 1% of those of beta-Ga2O3, and that its energy of formation is comparable to that of naturally abundant Fe2O3 polytypes. A superlattice of mu-Fe2O3/beta-Ga2O3 is grown by plasma assisted molecular beam epitaxy, with resulting high-resolution X-ray diffraction (XRD) measurements indicating that the mu-Fe2O3 layers are lattice-matched to the substrate. The measured out-of-plane (b) lattice parameter of 3.12 +/- 0.4 angstrom is in agreement with the predicted lattice constants and atomic-resolution scanning transmission electron microscopy (STEM) images confirm complete registry of the mu-Fe2O3 layers with beta-Ga2O3. Finally, DFT modeling predicts that bulk mu-Fe2O3 is antiferromagnetic, while the interface region between mu-Fe2O3 and beta-Ga2O3 leads to ferromagnetic coupling between interface Fe3+ cations selectively occupying tetrahedral positions. Magnetic hysteresis persisting observed via SQUID measurements, consistent with the computationally predicted interface magnetism.
机译：在这里，我们证明了一种新的单岩氧化铁相（MU-FE2O3），通过（010）β-GA2O3的生长外延稳定。密度函数理论（DFT）计算发现独立MU-FE2O3的晶格参数与β-GA2O3的1％相似，其形成能量与天然丰富的FE2O3多型相当。通过等离子体辅助分子束外延生长Mu-Fe2O3 /β-Ga2O3的超晶格，得到的高分辨率X射线衍射（XRD）测量，表明MU-FE2O3层与基材拼接。 3.12 +/- 0.4埃的测量的平面外（b）晶格参数与预测的晶格常数和原子分辨率扫描透射电子显微镜（Stew）图像一致地同时进行了一致，用β的MU-FE2O3层确认完整的注册表-ga2O3。最后，DFT建模预测散装MU-FE2O3是反铁磁，而MU-FE2O3和BETA-GA2O3之间的接口区域导致接口FE3 +阳离子之间的铁磁耦合，选择性地占据四面体位置。通过鱿鱼测量观察磁滞持续，与计算预测的界面磁力一致。

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  • 来源
    《Crystal growth & design》 |2019年第8期|共7页
  • 作者

    Jamison John S.; May Brelon J.; Deitz Julia I; Chien Szu-Chia; McComb David W.; Grassman Tyler J.; Windl Wolfgang; Myers Roberto C.;

  • 作者单位

    Ohio State Univ Dept Mat Sci &

    Engn 116 W 19Th Ave Columbus OH 43210 USA;

    Ohio State Univ Dept Mat Sci &

    Engn 116 W 19Th Ave Columbus OH 43210 USA;

    Ohio State Univ Dept Mat Sci &

    Engn 116 W 19Th Ave Columbus OH 43210 USA;

    Ohio State Univ Dept Mat Sci &

    Engn 116 W 19Th Ave Columbus OH 43210 USA;

    Ohio State Univ Dept Mat Sci &

    Engn 116 W 19Th Ave Columbus OH 43210 USA;

    Ohio State Univ Dept Mat Sci &

    Engn 116 W 19Th Ave Columbus OH 43210 USA;

    Ohio State Univ Dept Mat Sci &

    Engn 116 W 19Th Ave Columbus OH 43210 USA;

    Ohio State Univ Dept Mat Sci &

    Engn 116 W 19Th Ave Columbus OH 43210 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 晶体学;
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