Article
Chemistry, Multidisciplinary
Jan Philipp Bange, Vladimir Roddatis, Leonard Schueler, Fryderyk Lyzwa, Marius Keunecke, Sergei Lopatin, Vitaly Bruchmann-Bamberg, Vasily Moshnyaga
Summary: This study investigated the emergent magnetic behavior in (LaMnO3)(m)/(SrMnO3)(n) superlattice materials, revealing the influence of interfacial charge transfer on magnetism and discussing the effect of the LMO/SMO thickness ratio on emergent ferromagnetism.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Guowei Zhou, Zhilan Li, Jiarui Dou, Huihui Ji, Penghua Kang, Yufan Shen, Siqi Wang, Xiaohong Xu
Summary: In this study, polar and nonpolar interfaces in LaMnO3-based (LMO) superlattices were designed to investigate the differences in magnetic and transport properties. The polar interface exhibited novel robust ferromagnetism, exchange bias effect, vertical magnetization shift, and metallic behaviors due to the polar catastrophe, while the nonpolar interface only showed ferromagnetism and exchange bias effect characteristics. These different properties were attributed to the charge transfer between Mn3+ and Ni3+ ions at the interface. Transition metal oxides exhibit various novel physical properties due to the strong correlation of d electrons and the polar and nonpolar interfaces. Our observations may provide an approach to further tune the properties using the selected polar and nonpolar oxide interfaces.
Article
Materials Science, Multidisciplinary
Irina Piyanzina, Rinat Mamin
Summary: Our study investigates the possibility of a switchable two-dimensional electron gas at the interface of antiferromagnetic and ferroelectric perovskites, specifically in the LaMnO3/BaTiO3 superlattice. We demonstrate that by applying an external electric field, a two-dimensional conducting state can be induced. This phenomenon is stimulated by defects in the form of oxygen vacancies on the surface. The density of states at the Fermi-level can be controlled by reversing the ferroelectric polarization. The conducting state is mainly localized within the interfacial MnO layer and coexists with a magnetic state primarily generated by Mn atoms.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Physics, Applied
Haoming Wei, Xin Chen, Yangqiang Wu, Bingqiang Cao
Summary: In this study, epitaxial LaMnO3/LaScO3 superlattices were grown and their physical properties were investigated. The introduction of LaScO3 suppressed distortion in the superlattices, and the electrical and magnetic properties were influenced by the proportions of LaMnO3 and LaScO3 layers.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Physics, Multidisciplinary
T. A. Shaikhulov, A. R. Safin, K. L. Stankevich, A. V. Matasov, M. P. Temiryazeva, D. A. Vinnik, V. E. Zhivulin, S. A. Nikitov
Summary: An epitaxial heterostructure based on strontium and lanthanum-strontium manganite films (SrMnO3 and La0.7Sr0.3MnO3) was investigated. Various magnetic parameters, such as ferromagnetic resonance spectra, angular dependences of the resonance field, anisotropy, and magnetization as a function of temperature, were measured. The presence of interlayer exchange at the ferromagnet-antiferromagnet interface was found to induce unidirectional anisotropy in the heterostructure SrMnO3/La0.7Sr0.3MnO3 at low temperatures. These findings have practical implications for the development of antiferromagnet-based ultrafast devices: emitters, amplifiers, and detectors.
Article
Chemistry, Multidisciplinary
Aleksei O. Chibirev, Andrei Leontyev, Viktor V. Kabanov, Rinat F. Mamin
Summary: The study of Ba0.8Sr0.2TiO3/LaMnO3/Ba0.8Sr0.2TiO3 heterostructures revealed a metallic behavior of resistance at temperatures below 175 K, which is associated with an increased charge concentration at the interface due to a discontinuity in the ferroelectric polarization. Under uniform illumination, negative photoconductivity is observed, and the combined exposure to green and infrared light leads to cumulative effects. Kelvin mode atomic force microscopy measurements confirm the influence of illumination on surface charge concentration.
Article
Chemistry, Physical
Hend Kacem, Ah Dhahri, Z. Sassi, L. Seveyrat, L. Lebrun, V Perrin, J. Dhahri
Summary: Ferroelectric materials, such as lead-free BaTi0.91Sn0.09O3 ceramic, are widely used in sensors, transducers, and health monitoring systems due to their multi-physical coupling ability for energy harvesting applications. The structural information of the sample was determined using X-ray diffraction data and Raman spectra, showing ferroelectric behavior in relaxation. The sample exhibited a recovered energy density of 48.18 mJ/cm(3) and an energy efficiency of 41%, making it suitable for energy conversion applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Mechanics
Wai Hong Ronald Chan, Suhas S. Jain, Hanul Hwang, Annie Naveh, Snezhana I. Abarzhi
Summary: Interfacial Rayleigh-Taylor mixing is crucial in understanding important natural and engineering processes. Through theoretical formulation and simulations, the interfacial nature of Rayleigh-Taylor instabilities is demonstrated, allowing practical flow fields to be reconstructed using the proposed theory. The study also resolves a long-standing puzzle in Rayleigh-Taylor dynamics and provides valuable insights into its multiscale nature.
Review
Chemistry, Multidisciplinary
Shaofeng Wang, Jizhe Song, Mengtao Sun, Shuo Cao
Summary: This review presents extensive research on Moire materials in recent years, highlighting their significant properties and various applications. Moire superlattices exhibit superconductivity through flat-band and strong correlation effects, as well as topological properties. Modulating electronic interactions with magnetic fields enables the fractional quantum Hall effect in Moire materials. Moreover, Moire materials possess ferromagnetic and antiferromagnetic properties that can be achieved by tuning interlayer coupling and spin interactions. Lastly, the review discusses the applications of Moire materials in photocurrent, superconductivity, and thermoelectricity fields, showcasing their importance as a new dimension in the development of two-dimensional materials.
Article
Chemistry, Physical
Rui Hu Mi, Bu Hang Chen, Xiao Li Zhu, Xiang Ming Chen
Summary: Ba(Ti0.25Zr0.25Hf0.25Sn0.25)O3 high-entropy ceramics were prepared and their dielectric and ferroelectric characteristics in association with the structures were investigated. The ceramics showed a single-phase perovskite structure as confirmed by X-ray diffraction and energy dispersive spectroscopy analysis. The materials exhibited a broad dielectric peak with strong frequency dispersion, indicating a relaxor nature due to nanoscale ferroelectric domain structures. The homogeneous microstructure contributed to reduced leakage current density and significantly improved dielectric strength, making these ceramics desirable for practical applications. Compared to similar systems, Ba(Ti1-xZrx)O3 & Ba(Ti1-xSnx)O3, the high-entropy ceramics demonstrated superior relaxor ferroelectric characteristics.
JOURNAL OF MATERIOMICS
(2023)
Article
Materials Science, Ceramics
L. N. Shi, Y. G. Wang, Z. H. Ren, Aditya Jain, S. S. Jiang, F. G. Chen
Summary: In this study, rare earth oxide was added to the material to enhance its comprehensive energy storage performance. The samples showed high energy storage density, energy efficiency and temperature stability, indicating their potential application in high-temperature capacitors.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Arixin Bo, Yawei Liu, Bjoern Kuttich, Tobias Kraus, Asaph Widmer-Cooper, Niels de Jonge
Summary: Self-assembly of nanoscale structures at liquid-solid interfaces plays a crucial role in industrial processes and natural phenomena. The conventional theory is oversimplified, and in situ observations using liquid-phase scanning transmission electron microscopy are required. It has been found that modifying the molecular coating of the substrate can control the self-assembly structures of nanoparticles.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Zhigang Mu, Guoke Wei, Hang Zhang, Lu Gao, Yue Zhao, Shaolong Tang, Guangbin Ji
Summary: LaMnO3 perovskite has great potential in microwave absorption at high temperature due to its complex doping effect and super stability. The temperature dependence of Mn ion spin state has a significant impact on the high temperature dielectric behavior. The introduction of magnetic loss in a cellular array structure can further improve the operating temperature of LaMnO3.
Article
Physics, Multidisciplinary
A. V. Leont'ev, A. O. Chibirev, N. N. Garif'yanov, R. F. Mamin
Summary: The impact of infrared, green, and ultraviolet laser radiation on the electrical resistance of the Ba0.8Sr0.2TiO3/LaMnO3 heterostructure was studied, revealing an increase in resistance under illumination and a negative effect of photoconductivity under infrared, green, and ultraviolet radiation.
Article
Chemistry, Multidisciplinary
Masaaki Akamatsu, Ayumi Kimura, Koji Yamanaga, Kenichi Sakai, Hideki Sakai
Summary: The study evaluated anion-pi interactions at the solid/water interface and found that anion adsorption followed the hydration energy and the presence of conjugated systems of the anions by QCM measurements. Force curve measurements revealed that the single-molecule force of anion-pi interaction was approximately 40 pN between an NDI unit and the negatively charged surface of the cantilever. This study presented the first example of obtaining a single-molecule force for anion-pi interactions.
CHEMICAL COMMUNICATIONS
(2021)
Article
Microbiology
Jae-Chan Lee, Kyung-Sook Whang
Summary: A novel Gram-stain-negative bacterium strain YJ15(T) was isolated from soil at Bigeum island in Korea, and identified as a new species of the genus Lysobacter—Lysobacter telluris sp. nov. It exhibits distinct phenotypic, chemotaxonomic properties, and phylogenetic position.
ARCHIVES OF MICROBIOLOGY
(2021)
Article
Microbiology
Jae-Chan Lee, Kyung-Sook Whang
Summary: YJ20(T) is a novel bacterium isolated from the rhizosphere soil of a spinach farmland in Shinan, Korea. It belongs to the genus Altererythrobacter, with specific growth conditions and biochemical characteristics.
CURRENT MICROBIOLOGY
(2021)
Article
Chemistry, Physical
Nidhi Pandey, Mukul Gupta, Jochen Stahn
Summary: Nickel nitride thin film samples were deposited using reactive magnetron sputtering with varying N-2 partial flow, characterized using XRR, XRD, and XANES. The deposition rate and density of Ni-N films decreased with increasing R-N2, indicating the formation of Ni-N alloys and compounds. XRD and XANES measurements confirmed the evolution of different Ni-N compounds with Ni target surface and thin film samples. Neutron reflectivity measurements showed that Ni-N thin films became non-magnetic with increasing N incorporation. Comparisons with Fe-N and Co-N systems revealed similarities and differences in growth behavior.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Hae Won Cho, Pavan Pujar, Minsu Choi, Seunghun Kang, Seongin Hong, Junwoo Park, Seungho Baek, Yunseok Kim, Jaichan Lee, Sunkook Kim
Summary: The direct growth of polar orthorhombic phase in Hf0.5Zr0.5O2 (HZO) thin films using Pulsed Laser Deposition (PLD) has been reported. The PLD-HZO technique, integrated with HfO2 dielectric, has shown promising results for low power integrated digital/analog circuits.
NPJ 2D MATERIALS AND APPLICATIONS
(2021)
Article
Materials Science, Multidisciplinary
G. Bimashofer, S. Smetaczek, E. Gilardi, C. W. Schneider, A. Limbeck, T. Lippert, J. Stahn
Summary: LixLaySrzMnO3 thin films of various compositions were grown using pulsed laser deposition, studying the effects of deposition temperature, target-to-substrate distance, and deposition pressure on the film's composition. The experiments also showed that lithium loss is likely when growing multi-elemental oxide thin films, but specific growth conditions and different target compositions can help achieve the desired film composition.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Review
Physics, Condensed Matter
Wolfgang Kreuzpaintner, Andreas Schmehl, Alexander Book, Thomas Mairoser, Jingfan Ye, Birgit Wiedemann, Sina Mayr, Jean-Francois Moulin, Jochen Stahn, Dustin A. Gilbert, Henrik Gabold, Zahra Inanloo-Maranloo, Michael Heigl, Sergey Masalovich, Robert Georgii, Manfred Albrecht, Jochen Mannhart, Peter Boeni
Summary: Polarized neutron reflectometry (PNR) has evolved into a unique research tool for analyzing magnetization profiles in thin films and heterostructures, with recent advancements allowing for the in situ growth of thin magnetic films directly in the neutron beam.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Multidisciplinary Sciences
Ji-Yong Kim, Deokgi Hong, Jae-Chan Lee, Hyoung Gyun Kim, Sungwoo Lee, Sangyong Shin, Beomil Kim, Hyunjoo Lee, Miyoung Kim, Jihun Oh, Gun-Do Lee, Dae-Hyun Nam, Young-Chang Joo
Summary: Surface reconstruction of electrocatalysts is important for converting carbon dioxide to value-added chemical products. In this study, stable CO2 to C2H4 conversion is achieved by using copper nanoparticles protected by self-formed quasi-graphitic carbon shell.
NATURE COMMUNICATIONS
(2021)
Correction
Nanoscience & Nanotechnology
Hae Won Cho, Pavan Pujar, Minsu Choi, Seunghun Kang, Seongin Hong, Junwoo Park, Seungho Baek, Yunseok Kim, Jaichan Lee, Sunkook Kim
NPJ 2D MATERIALS AND APPLICATIONS
(2021)
Article
Nanoscience & Nanotechnology
Haewon Cho, Pavan Pujar, Minsu Choi, Muhammad Naqi, Yongin Cho, Hyun Yeol Rho, Jaichan Lee, Sunkook Kim
Summary: By integrating ferroelectric negative capacitors with materials grown through atomic layer deposition, the study achieves high-efficiency operation at minimum input power expenses, addressing challenges in electronics such as short channel effects and high operating voltages.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Condensed Matter
Niti, Yogesh Kumar, Seema, V. R. Reddy, Joseph Vimal Vas, Surbhi Gupta, Jochen Stahn, Ajay Gupta, Mukul Gupta
Summary: This work investigates the effect of Ag doping on the phase formation of FeN thin films and finds that Ag doping at around 5 at.% not only improves the thermal stability of FeN but also reduces intrinsic defects. The study shows that Ag doping reduces Fe self-diffusion in FeN by occupying grain-boundary positions as nanoparticles.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Instruments & Instrumentation
Alexander Book, Sina Mayr, Jochen Stahn, Peter Boni, Wolfgang Kreuzpaintner
Summary: The reconstruction of the complex reflection coefficient using in situ Polarized Neutron Reflectometry is presented in this study. By employing the reference layer method with a magnetic Fe layer, the phase information of the underlying Cu(001) seed layer sample structure was successfully retrieved and compared with results obtained from traditional fitting. Two different approaches for retrieving the phase information using reference layers were compared.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2022)
Article
Materials Science, Multidisciplinary
Pramod Vishwakarma, Gagan Sharma, M. H. Modi, Mukul Gupta, Jochen Stahn, Ajay Gupta
Summary: The migration of boron in CoFeB/MgO multilayer during the amorphous to crystalline transformation in CoFeB has been investigated using Polarized Neutron Reflectivity (PNR) and anomalous Soft X-ray Reflectivity (SXR). Both PNR and anomalous SXR results indicate that boron tends to move away from the MgO/CoFeB interfaces and forms a boride layer in the middle of the magnetic layer upon thermal annealing. These findings are significant for understanding the role of boron in CoFeB/MgO based magnetic tunnel junctions.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Nanoscience & Nanotechnology
H. Park, M. M. Rahman, A. Bala, Y. -H. Kim, A. Sen, Y. -M. Kim, J. Lee, S. Kim
Summary: This study successfully achieved nanoscale patterning on two-dimensional materials through molecular simulation and experiments, and found that different nanostructures have different effects on the electronic characteristics, which is of great significance for improving the performance of optoelectronic devices.
MATERIALS TODAY NANO
(2023)
Article
Chemistry, Physical
Seulyoung Park, Sehoon Oh, Jaichan Lee
Summary: Halide perovskites (HPs) are promising solar energy conversion materials, but their stability against humidity is a major challenge. Two-dimensional halide perovskites (2D HPs) have been proposed as a solution, but they still lack thermodynamic stability. In this study, we demonstrate that an external electric field can enhance the humidity resistance of 2D HPs and make them suitable for photocatalytic HI splitting.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Gi-Baek Lee, In-Kyoung Ahn, Won-Hyo Joo, Jae-Chan Lee, Ji-Yong Kim, Deokgi Hong, Hyoung Gyun Kim, Jusang Lee, Miyoung Kim, Dae-Hyun Nam, Young-Chang Joo
Summary: Single-atom metal sites around active materials can enhance CO2RR performance by controlling local CO2 concentration. By utilizing the difference in oxidation Gibbs free energy between metals, AgZn-CNF materials were produced and showed significantly higher Faradaic efficiency for CO during CO2RR.
