Jine Zhang

Beihang University

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Baogen Shen

University of Chinese Academy of Sciences

Fengxia Hu

Chinese Academy of Sciences

Yuansha Chen

Chinese Academy of Sciences

Furong Han

Beihang University

Jirong Sun

Chinese Academy of Sciences

Xiaobing Chen

Tianjin University of Technology

Hui Zhang

UNSW Sydney

Jirong Sun

University of Chinese Academy of Sciences

Shaojin Qi

Institute of Physics

Hailin Huang

Air Force Engineering University

Cooperative Institutions

Chinese Academy of Sciences

133

University of Chinese Academy of Sciences

101

Institute of Physics

National Laboratory for Superconductivity

Czech Academy of Sciences, Institute of Physics

Songshan Lake Materials Laboratory

Beihang University

Peking University

Nanjing University

University of Science and Technology of China

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Symmetry‐Mismatch‐Induced Ferromagnetism in the Interfacial Layers of CaRuO₃/SrTiO₃ Superlattices

Advanced Functional Materials (2023)

Wenxiao Shi Jine Zhang Xiaobing Chen Qinghua Zhang Xiaozhi Zhan

Abstract By modifying the entangled multi‐degrees of freedom of transition‐metal oxides, interlayer coupling usually produces interfacial phases with unusual functionalities. Herein, a symmetry‐mismatch‐driven interfacial phase transition from paramagnetic to ferromagnetic state is reported. By constructing superlattices using CaRuO 3 and SrTiO 3 , two oxides with different oxygen octahedron networks, the tilting/rotation of oxygen octahedra near interface is tuned dramatically, causing an angle increase from ≈150° to ≈165° for the RuORu bond. This in turn drives the interfacial layer of CaRuO 3 , ≈3 unit cells in thickness, from paramagnetic into ferromagnetic state. The ferromagnetic order is robust, showing the highest Curie temperature of ≈120 K and the largest saturation magnetization of ≈0.7 µ B per formula unit. Density functional theory calculations show that the reduced tilting/rotation of RuO 6 octahedra favors an itinerant ferromagnetic ground state. This work demonstrates an effective phase tuning by coupled octahedral rotations, offering a new approach to explore emergent materials with desired functionalities.

Saturation (graph theory)

10.1002/adfm.202300338

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Citations (11)

Two-Dimensional Wedge-Shaped Magnetic EuS: Insight into the Substrate Step-Guided Epitaxial Synthesis on Sapphire

Journal of the American Chemical Society (2022)

Biao Zhang Chao Yun HengAn Wu Zijing Zhao Yi Zeng

Rare earth chalcogenides (RECs) with novel luminescence and magnetic properties offer fascinating opportunities for fundamental research and applications. However, controllable synthesis of RECs down to the two-dimensional (2D) limit still has a great challenge. Herein, 2D wedge-shaped ferromagnetic EuS single crystals are successfully synthesized via a facile molten-salt-assisted chemical vapor deposition method on sapphire. Based on the theoretical simulations and experimental measurements, the mechanisms of aligned growth and wedge-shaped growth are systematically proposed. The wedge-shaped growth is driven by a dual-interaction mechanism, where the coupling between EuS and the substrate steps impedes the lateral growth, and the strong bonding of nonlayered EuS itself facilitates the vertical growth. Through temperature-dependent Raman and photoluminescence characterization, the nanoflakes show a large Raman temperature coefficient of -0.030 cm-1 K-1 and uncommon increasing band gap with temperature. More importantly, by low-temperature magnetic force microscopy characterization, thickness variation of the magnetic signal is revealed within one sample, indicating the great potential of the wedge-shaped nanoflake to serve as a platform for highly efficient investigation of thickness-dependent magnetic properties. This work sheds new light on 2D RECs and will offer a deep understanding of 2D wedge-shaped materials.

Wedge (geometry)

Characterization

10.1021/jacs.2c06023

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Citations (15)

Topotactic transition between perovskite and brownmillerite phases for epitaxial LaCoO_3−δ films and effects thus resulted

Journal of Physics D Applied Physics (2020)

Hailin Huang Jine Zhang Hui Zhang Furong Han Xiaobing Chen

Brownmillerite

10.1088/1361-6463/ab6bef

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High-Performance Liquid Chromatographic Enantioseparation of Racemic Drugs Based on Homochiral Metal–Organic Framework

Analytical Chemistry (2013)

Xuan Kuang Yu Ma Hao Su Jine Zhang Yu‐Bin Dong

Homochiral metal-organic frameworks with fine-tuned pore sizes/walls and large surface areas are promising porous materials for enantioseparation considering the traditional zeolite molecular sieves have no chirality. Using enantiopure pyridyl-functionalized salen [(N-(4-Pyridylmethyl)-L-leucine·HBr)] as a starting material, we have prepared a noninterpenetrated three-dimensional homochiral metal organic framework {[ZnLBr]·H2O}n, which was further used as a chiral stationary phase for high-performance liquid chromatography to enantioseparate racemic drugs, showing excellent performances in enantioseparation of drugs. The metal-organic framework can be regarded as a novel molecular sieve-like material with a chiral separation function based on the relative sizes of the chiral channels and the resolved molecules.

10.1021/ac403674p

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Citations (174)

Strain-Inhibited Electromigration of Oxygen Vacancies in LaCoO₃

ACS Applied Materials & Interfaces (2019)

Liang Zhu Shulin Chen Hui Zhang Jine Zhang Yuanwei Sun

The oxygen vacancy profile in LaCoO3 exhibits rich phases with distinct structures, symmetries, and magnetic properties. Exploration of the lattice degree of freedom of LaCoO3 in the transition between these different structural phases may provide a route to enable new functionality in oxide materials with potential applications. To date, the oxygen vacancy profile transition in LaCoO3 has mainly been induced by transition-metal doping or thermal treatment. Epitaxial strain was proposed to compete with the lattice degree of freedom but has not yet been rationalized. Here, the experimental findings of strain-inhibited structural transition from perovskite to brownmillerite during the electromigration of oxygen vacancies in epitaxial LaCoO3 thin films are demonstrated. The results indicate that the oxygen vacancy ordering phase induced by the electric field is suppressed locally by both epitaxial strain field and external loads shown by in situ aberration-corrected (scanning)/ transmission electron microscopy. The demonstrated complex interplay between the electric and strain fields in the structural transitions of LaCoO3 opens up prospects for manipulating new physical properties by external excitations and/or strain engineering of a substrate.

Electromigration

Brownmillerite

10.1021/acsami.9b08406

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Citations (17)

Charge-Transfer-Induced Interfacial Ferromagnetism in Ferromagnet-Free Oxide Heterostructures

ACS Nano (2024)

Jie Zheng Wenxiao Shi Zhe Li Jing Zhang Chao‐Yao Yang

Due to the strong interlayer coupling between multiple degrees of freedom, oxide heterostructures have demonstrated exotic properties that are not shown by their bulk counterparts. One of the most interesting properties is ferromagnetism at the interface formed between "nonferromagnetic" compounds. Here we report on the interfacial ferromagnetic phase induced in the superlattices consisting of the two paramagnetic oxides CaRuO

Superexchange

Ferromagnetic material properties

10.1021/acsnano.4c01910

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Citations (4)

Fermi-Level-Dependent Charge-to-Spin Conversion of the Two-Dimensional Electron Gas at the γ - Al2O3/KTaO3 Interface

Physical Review Applied (2023)

Hui Zhang Zengtai Zhu Yungu Zhu Xiaobing Chen Qisheng Jiang

Charge-to-spin conversion is crucial for the application of emerging spintronic devices. A two-dimensional electron gas (2DEG) at a complex oxide interface usually possesses strong Rashba spin-orbit coupling, and spin-momentum locking offers a great possibility for efficient charge-to-spin conversion through the Rashba-Edelstein effect. Here, we report the fabrication of metallic 2DEGs in \ensuremath{\gamma}-${\mathrm{Al}}_{2}{\mathrm{O}}_{3}/{\mathrm{KTaO}}_{3}$ spinel/perovskite heterostructures and investigate the charge-to-spin conversion for Py/\ensuremath{\gamma}-${\mathrm{Al}}_{2}{\mathrm{O}}_{3}/{\mathrm{KTaO}}_{3}$ devices using the technique of spin-torque ferromagnetic resonance. The sizable spin splitting of the band structure results in a large current-induced spin-orbit torque efficiency with values up to around 3.6 at 5 K and about 1.1 at 300 K, which are more than an order of magnitude higher than those of heavy metals (0.07 for $\mathrm{Pt}$ at 300 K). Moreover, both theoretical and experimental results show that the charge-to-spin conversion is strongly dependent on the position of the Fermi level. These results demonstrate that optimizing the band filling of a ${\mathrm{KTaO}}_{3}$-based 2DEG is crucial for maximizing the conversion efficiency.

10.1103/physrevapplied.19.034045

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Citations (4)

CCDC 937883: Experimental Crystal Structure Determination

The Cambridge Structural Database (2016)

Xuan Kuang Yu Ma Hao Su Jine Zhang Yu‐Bin Dong

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccdc.csd.cc10gy9q

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Perpendicular magnetic anisotropy in La1−xSrxCoO2.5

Physical review. B./Physical review. B (2019)

Jine Zhang Furong Han Wei Wang Xi Shen Jing Zhang

Perpendicular magnetic anisotropy (PMA) of magnetic materials has received much attention because of its potential application to spintronics devices. In general, the tensely strained $(001)\text{\ensuremath{-}}\mathrm{L}{\mathrm{a}}_{2/3}\mathrm{S}{\mathrm{r}}_{1/3}\mathrm{Mn}{\mathrm{O}}_{3}$ (LSMO) layer is easy plane. Here we demonstrate that the tensile LSMO layer will exhibit an out-of-plane magnetic anisotropy if it is sandwiched between two $\mathrm{L}{\mathrm{a}}_{1\ensuremath{-}x}\mathrm{S}{\mathrm{r}}_{x}\mathrm{Co}{\mathrm{O}}_{2.5+\ensuremath{\delta}}$ (LSCO) layers. The most remarkable observation is that the PMA enhances with the increase of the Sr content in LSCO. It is $\ensuremath{\sim}2.7\ifmmode\times\else\texttimes\fi{}{10}^{6}\phantom{\rule{0.16em}{0ex}}\mathrm{erg}/\mathrm{c}{\mathrm{m}}^{3}$ for $x=0.05$ and $\ensuremath{\sim}4.3\ifmmode\times\else\texttimes\fi{}{10}^{6}\phantom{\rule{0.16em}{0ex}}\mathrm{erg}/\mathrm{c}{\mathrm{m}}^{3}$ for $x=0.5$. This value is two orders of magnitude greater than that obtained by compressively straining the LSMO film $(\ensuremath{\sim}{10}^{4}\phantom{\rule{0.16em}{0ex}}\mathrm{erg}/\mathrm{c}{\mathrm{m}}^{3})$. Analysis of high resolution lattice image shows the formation of perovskite/brownmillerite-type interfaces in the multilayers: Brownmillerite-like lattice structure forms in the interfacial layers of LSCO, resulting in a coherent tilting of adjacent $\mathrm{Mn}{\mathrm{O}}_{6}$ octahedra. This in turn leads to, as evidenced by the analysis of x-ray linear dichroism, selective orbital occupation thus spin reorientation. There is evidence that the brownmillerite-structured LSCO is more easily formed when $x$ is high, which explains the growth of anisotropy constant with the increase of Sr content.

Brownmillerite

Lattice (music)

10.1103/physrevb.100.094432

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Citations (11)

Symmetry mismatch-driven perpendicular magnetic anisotropy for La 2/3 Sr 1/3 MnO 3 /LaCoO 2.5 (LSMO/LCO) heterostructures

Bulletin of the American Physical Society (2018)

Jing Zhang Zhicheng Zhong Xiangxiang Guan Jine Zhang Furong Han

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