Kousuke Ooe

Ferromagnetic-like behavior emerging from local CoO 6 honeycomb motifs in Co-doped NaSbO 3 thin films

Hao‐Bo Li, Weitao Yan, Shunsuke Kobayashi, Kousuke Ooe et autres

The strongly correlated oxides with a honeycomb lattice have attracted vast attention due to their interesting magnetic behaviors and emergent quantum effects such as Majorana fermions generated from Kitaev spin liquid. High-quality single crystal samples with delicately controlled composition and strain are …

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Enhancing Dose Efficiency of Optimum Bright‐Field Scanning Transmission Electron Microscopy Using a Phase‐Shifted Electron Probe

Mitsuru Nogami, Takehito Seki, Kousuke Ooe, Naoya Shibata

Observing beam-sensitive materials using scanning transmission electron microscopy (STEM) at low electron dose conditions is challenging due to the low signal-to-noise ratio (SNR) of images. In this study, we aimed to improve the SNR of optimum bright-field (OBF) STEM by introducing phase …

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A strategy for dose-efficient atomic-resolution OBF-STEM imaging of zeolites

Kousuke Ooe, Takehito Seki, Kaname Yoshida, Yuji Kohno et autres

Observation of beam-sensitive materials in scanning transmission electron microscopy (STEM) requires not only the development of highly dose-efficient imaging techniques but also the selection of appropriate imaging conditions such as the raster-scan sampling rate and optical parameters to realise a low-dose condition …

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Direct observation of cation-dependent polarisation switching dynamics in fluorite ferroelectrics

Kousuke Ooe, Yufan Shen, Kazuki Shitara, Rintaro MAKI et autres

OBF-STEM datasets presented in the article "Direct observation of cation-dependent polarisation switching dynamics in fluorite ferroelectrics".

Direct observation of cation-dependent polarisation switching dynamics in fluorite ferroelectrics

Kousuke Ooe, YUFAN SHEN, Kazuki Shitara, Rintaro MAKI et autres

OBF-STEM datasets presented in the article "Direct observation of cation-dependent polarisation switching dynamics in fluorite ferroelectrics".

Direct observation of cation-dependent polarisation switching dynamics in fluorite ferroelectrics

Kousuke Ooe, Yufan Shen, Kazuki Shitara, Rintaro MAKI et autres

Fluorite ferroelectrics are exciting candidates for next-generation non-volatile memory devices because their unique ferroelectric mechanism, which arises from unconventional oxygen displacements, permits ferroelectricity with minimal thickness constraints. However, the polarisation switching mechanism remains the subject of intense debate due to a limited …

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Direct observation of cation-dependent polarisation switching dynamics in fluorite ferroelectrics

Kousuke Ooe, Yufan Shen, Kazuki Shitara, Rintaro MAKI et autres

OBF-STEM datasets presented in the article "Direct observation of cation-dependent polarisation switching dynamics in fluorite ferroelectrics".

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Optimizing Structure Factors From Four-dimensional Scanning Transmission Electron Microscopy via the Scattering Matrix

Kousuke Ooe, Alireza Sadri, Scott D. Findlay

Quantitative potential retrieval in scanning transmission electron microscopy (STEM) is of much importance for detailed material characterization but is often hindered by substantial multiple scattering effects in thicker samples. Here, we propose a gradient-descent-based optimization algorithm to obtain the quantitative potential from …

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Direct observation of cation-dependent polarisation switching dynamics in fluorite ferroelectrics

Kousuke Ooe, Yufan Shen, Kazuki Shitara, Shunsuke Kobayashi et autres

Fluorite ferroelectrics are exciting candidates for next-generation non-volatile memory devices because their unique ferroelectric mechanism, which arises from unconventional oxygen displacements, permits ferroelectricity with minimal thickness constraints. However, the polarisation switching mechanism remains the subject of intense debate due to a limited …

Ferroelectric ZrO2/Hf0.5Zr0.5O2 epitaxial Moiré heterostructures

Yufan Shen, Kousuke Ooe, Dawei Zhang, Lingling Xie et autres

While oxide heterostructures with emergent properties have garnered a great amount of research interest, heterostructures consisting of oxides with metastable phases have barely been investigated. Here, we fabricated epitaxial bilayer structures based on ZrO2 (ZO) and Hf0.5Zr0.5O2 (HZO) whose single layers, respectively, …

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Ultrathin freestanding membranes of Zr O 2 with metastable structures and strain-dependent electrical properties

Yufan Shen, Kousuke Ooe, Kazuki Shitara, Shunsuke Kobayashi et autres

Fabricating and investigating freestanding membranes of materials are key approaches for exploring the intrinsic properties of those materials, even in their metastable phases stabilized by external factors. In this study, we fabricated freestanding $\mathrm{Zr}{\mathrm{O}}_{2}$ membranes with metastable crystal structures by exfoliating $\mathrm{Zr}{\mathrm{O}}_{2}$ …

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Asymmetric Atomic Coordination of Platinum Skin Layer on Intermetallic Platinum–Cobalt Particles

Shunsuke Kobayashi, Yuki Omori, Kei Nakayama, Kousuke Ooe et autres

Pt-based intermetallic alloy particles with a Pt skin layer have higher catalytic activity than solid-solution alloy particles and have attracted considerable attention for practical applications in polymer electrolyte fuel cells. However, the reason for the superior performance of intermetallic alloys is not …

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