Article
Multidisciplinary Sciences
S. Soltan, S. Macke, S. E. Ilse, T. Pennycook, Z. L. Zhang, G. Christiani, E. Benckiser, G. Schuetz, E. Goering
Summary: Interface engineering in complex oxide superlattices is a growing field, allowing manipulation of properties and access to new phases. In this study, we demonstrate how interfacial interactions induce a complex charge and spin structure in a bulk paramagnetic material. By observing the emerging magnetism in LaNiO3 (LNO) through an exchange bias mechanism, we find that the interfaces exhibit non-symmetric interface induced magnetization profiles, indicating a periodic complex charge and spin superstructure.
SCIENTIFIC REPORTS
(2023)
Article
Physics, Multidisciplinary
Maciej Dabrowski, Robert J. Hicken, Andreas Frisk, David G. Newman, Christoph Klewe, Alpha T. N'Diaye, Padraic Shafer, Gerrit van der Laan, Thorsten Hesjedal, Graham J. Bowden
Summary: Non-collinear spin structures in [Co/Pt]/Pt/Py films with an additional Pt spacer for coupling control were studied using VNA-FMR and XFMR techniques. Results showed slight pinning of Py dynamic magnetization by [Co/Pt], with observation of PSSW, CSSW, and HSSW states morphing under reduced magnetic field. The CSSW modes are particularly relevant for microwave assisted magnetic recording applications.
NEW JOURNAL OF PHYSICS
(2021)
Article
Physics, Applied
Mohammad Tomal Hossain, Sergi Lendinez, Laura Scheuer, Evangelos Th. Papaioannou, M. Benjamin Jungfleisch
Summary: In this study, we reported the generation and detection of spin-orbit torque ferromagnetic resonance in micropatterned Fe/Pt bilayers grown by molecular beam epitaxy. Our results demonstrate a simple and efficient method for determining magnetic anisotropies in microstructures using rf spectroscopy. The experimental STFMR measurements were compared with broadband ferromagnetic resonance spectroscopy and magneto-optical Kerr effect measurements to confirm the findings.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Zhizhi Zhang, Huanhuan Yang, Zhenyu Wang, Yunshan Cao, Peng Yan
Summary: In this study, a strong-coupling theory for perpendicular standing spin waves (PSSWs) in ferromagnetic bilayers with interlayer exchange coupling (IEC) is formulated. PSSWs are shown to be quantized with nonintegral quantum numbers, and the magnon-magnon coupling is characterized by spectrum splitting linearly with the IEC which gets saturated in the strong-coupling limit. Analytical predictions are confirmed by full micromagnetic simulations with good agreement.
Article
Materials Science, Multidisciplinary
M. Slezak, H. Nayyef, P. Drozdz, W. Janus, A. Koziol-Rachwal, M. Szpytma, M. Zajac, T. O. Mentes, F. Genuzio, A. Locatelli, T. Slezak
Summary: The magnetic properties of easy-plane antiferromagnetic NiO(111) thin films epitaxially grown on ferromagnetic Fe(110) layers can be modified by tuning the thickness of Fe, changing the temperature, or applying small external magnetic field. The orientation and anisotropy of the NiO spins are determined by the underlying ferromagnetic Fe layer.
Article
Materials Science, Multidisciplinary
Yangkun He, Zsolt Gercsi, Rui Zhang, Yu Kang, Yurii Skourski, Lucy Prendeville, Orrie Larmour, Jean Besbas, Claudia Felser, Plamen Stamenov, J. M. D. Coey
Summary: In this study, the magnetism and magnetic properties of tetragonal Au4Mn alloy at room temperature were investigated. The results showed that Au4Mn has large, localized magnetic moments and high magnetic hardness along the c-axis. The hybridization of electron orbitals between Au and Mn also leads to a reduction in the spin moment of Mn.
Article
Materials Science, Multidisciplinary
Shuvankar Gupta, Sudip Chakraborty, Vidha Bhasin, Santanu Pakhira, Shovan Dan, Celine Barreteau, Jean-Claude Crivello, S. N. Jha, Maxim Avdeev, D. Bhattacharyya, V. Paul-Boncour, Chandan Mazumdar
Summary: We report the synthesis and characterization of a novel quaternary Heusler alloy CoMnCrGa, revealing its structural, magnetic, transport, and electronic properties. The compound exhibits a high spin polarization and adheres to the Slater-Pauling rule, making it a promising candidate for room temperature spintronics applications.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Electrochemistry
Alessandro Chiara, Giovanna Canu, Alessandro Longo, Candida Pipitone, Antonino Martorana, Francesco Giannici
Summary: Research found limited solid-state compatibility between calcium-doped lanthanum niobate and three perovskite cathode materials, with poor stability at high temperatures.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Physical
Jindi Feng, Kunpeng Li, Mingkun Zheng, Wancheng Zhang, Yong Liu, Dengjing Wang, Zhenhua Zhang, Chao Zuo, Rui Xiong, Zhihong Lu
Summary: Magnetic tunnel junctions (MTJs) with efficient spin-filtering effect and large tunneling magnetoresistance (TMR) ratio are highly desirable in spintronics. This study investigates the spin-dependent transport properties of van der Waals (vdW) MTJs comprising a 2H-WSe2 tunnel barrier and a 1T-CrSe2 or 1T-MoSe2/1T-CrSe2 electrode. The dual-electrode MTJ exhibits excellent spin-filtering effect and a giant TMR ratio, attributed to the half-metallicity of CrSe2 induced by charge transfer at the electrode interface.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Applied
Jingyao Xu, Xia Zhong, Xiaofeng Wu, Ying Wang, Shouhua Feng
Summary: This study develops a spin-state and delocalized electron regulation method to optimize the performance of oxygen evolution reaction (OER) by in-situ growth of NiCo2(OH)(x) and plasma treatment. The results reveal that the coupling of NiCo2(OH)(x) and MXene induces spin-state transition of Co3+ and transition metal ions electron delocalization, and the plasma treatment further optimizes the electron orbital structure and delocalized electron density. The optimized electrocatalyst exhibits excellent OER activity.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Chemistry, Physical
Haoyang Sun, Zhen Luo, Chuanchuan Liu, Chao Ma, Zijian Wang, Yuewei Yin, Xiaoguang Li
Summary: This study reports a flexible FTJ memristor grown on a mica substrate, which exhibits stable voltage-tuned multistates and robust resistive switching behavior after multiple bending cycles. Artificial neural network simulations based on experimental device behaviors demonstrate high recognition accuracies, highlighting the potential applications of this flexible FTJ as a data storage and processing device.
JOURNAL OF MATERIOMICS
(2022)
Article
Chemistry, Physical
Hengli Duan, Guinan Li, Hao Tan, Chao Wang, Qian Li, Chuanchuan Liu, Yuewei Yin, Xiaoguang Li, Zeming Qi, Wensheng Yan
Summary: In this study, a strategy to tune the interlayer exchange interaction of a centimeter-scale MoS2 bilayer by introducing Co ion substitution and sulfur vacancy modulation is reported. The transformed magnetic interaction from antiferromagnetism to ferromagnetism is confirmed through experimental characterization and theoretical calculations, showing enhanced magnetization due to altered interlayer orbital hybridizations and intralayer ferromagnetism. This work opens up new possibilities for manipulating interlayer exchange interactions with defects in two-dimensional magnetic materials.
Article
Nanoscience & Nanotechnology
Xinzhe Du, Haoyang Sun, He Wang, Jiachen Li, Yuewei Yin, Xiaoguang Li
Summary: Hf0.5Zr0.5O2-based ferroelectric tunnel junction (FTJ) memristor exhibits high-speed switching of 20 ns, a giant electroresistance ratio of around 834, and good retention exceeding 10(4) s, with multiple states of 8 or three bits. As a solid synaptic device, adjustable synapse functions such as long-term potentiation, long-term depression, and spike-timing-dependent plasticity have been achieved.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Zhizhan Dai, Zhiwei Bao, Song Ding, Chuanchuan Liu, Haoyang Sun, He Wang, Xiang Zhou, Yuchen Wang, Yuewei Yin, Xiaoguang Li
Summary: The study developed nanocomposites based on polyimide-poly(amic acid) copolymers with a very low amount of boron nitride nanosheets, significantly enhancing the energy density and efficiency of high-temperature capacitors. Experimental results demonstrate outstanding performance of the high-temperature polymer-based capacitors under actual working conditions, withstanding charge-discharge cycles and high-temperature endurance tests.
ADVANCED MATERIALS
(2022)
Article
Multidisciplinary Sciences
Zhen Luo, Zijian Wang, Zeyu Guan, Chao Ma, Letian Zhao, Chuanchuan Liu, Haoyang Sun, He Wang, Yue Lin, Xi Jin, Yuewei Yin, Xiaoguang Li
Summary: A high-performance synaptic device based on ferroelectric tunnel junction has been designed and established. This device exhibits ultrafast speed, low power consumption, and multiple non-volatile states. Experimental results show that this device achieves high online learning accuracy in recognizing fashion product images and demonstrates good robustness to input image noise.
NATURE COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Zijian Wang, Zeyu Guan, Haoyang Sun, Zhen Luo, Haoyu Zhao, He Wang, Yuewei Yin, Xiaoguang Li
Summary: Ferroelectric tunnel junctions (FTJs) have the capability to scale down and exhibit high-performance and multi-state storage characteristics, enabling them to emulate the fundamental functions of biological synapses. A convolutional neural network simulation based on experimental results achieves high recognition accuracy on fashion product images and exhibits robustness to input image noises, demonstrating the potential of FTJs for information storage and neural network computing.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Shamim Shahrokhi, Milos Dubajic, Zhi-Zhan Dai, Saroj Bhattacharyya, Richard A. Mole, Kirrily C. Rule, Mohan Bhadbhade, Ruoming Tian, Nursultan Mussakhanuly, Xinwei Guan, Yuewei Yin, Michael P. Nielsen, Long Hu, Chun-Ho Lin, Shery L. Y. Chang, Danyang Wang, Irina V. Kabakova, Gavin Conibeer, Stephen Bremner, Xiao-Guang Li, Claudio Cazorla, Tom Wu
Summary: This study reveals that phase transitions in mixed-halide hybrid perovskite crystals can be substantially suppressed through material engineering. The research also sheds light on the complex structural evolution of these materials and its correlation with the properties of organic cations and optical phonons.
Article
Chemistry, Physical
Zhiwei Bao, Xinzhe Du, Song Ding, Jiahao Chen, Zhizhan Dai, Chuanchuan Liu, Yuchen Wang, Yuewei Yin, Xiaoguang Li
Summary: This study presents a method to enhance the working temperature of a polymer-based capacitor by depositing alumina layers onto biaxially oriented polypropylene films. The composite film shows improved dielectric properties, mechanical properties, and thermal conductivity, enabling high discharged energy density and stability over multiple cycles at high temperature.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Aiwen Xie, Jian Fu, Ruzhong Zuo, Xuewen Jiang, Tianyu Li, Zhengqian Fu, Yuewei Yin, Xiaoguang Li, Shujun Zhang
Summary: Supercritical relaxor nanograined ferroelectrics demonstrate high-performance dielectric capacitors with record-high overall properties, showing high energy density and efficient charge-discharge performances.
ADVANCED MATERIALS
(2022)
Article
Physics, Applied
Xiang Zhou, Haoyang Sun, Zhen Luo, Haoyu Zhao, Deshan Liang, Hasnain Mehdi Jafri, Houbing Huang, Yuewei Yin, Xiaoguang Li
Summary: Exotic polarization domain configurations in BiFeO3 nanoislands have been achieved, showing promise for next-generation nanoelectronics and high-density information storage.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Kai Liu, Feng Jin, Xingchang Zhang, Kuan Liu, Zixun Zhang, Enda Hua, Jinfeng Zhang, Huan Ye, Guanyin Gao, Chao Ma, Lingfei Wang, Wenbin Wu
Summary: This study systematically investigates and explores the enhancement of ferroelectricity in hafnium oxides by anisotropic strain-mediated symmetry engineering. The results show that different types of anisotropic strains can affect the ferroelectricity by tuning the structural symmetry and phase ratio.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Physics, Applied
Shuang-Shuang Li, Ying Zhang, Jing-Shi Ying, Zao-Cai Wang, Jian-Min Yan, Guan-Yin Gao, Mao Ye, Ren-Kui Zheng
Summary: Epitaxial growth of SrIrO3 (SIO) thin films on (001)-oriented 0.7Pb(Mg1/3Nb2/3)O-3-0.3PbTiO(3) (PMN-PT) single-crystal substrates enables in situ tuning and modulation of the electronic transport properties of SIO films through strain induced by ferroelectric domain rotation, piezoelectric effect, and structural phase transition in the PMN-PT layer. Furthermore, the weak negative magnetoresistance (MR) of the SIO films can be modified by applying an electric field to the PMN-PT layer, showing in-plane compressive strain-induced suppression of quantum corrections to the conductivity in the SIO film. These results demonstrate the importance of electric-field controllable lattice strain in understanding the strain-property relationships of 5d iridate thin films.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Applied
Jiachen Li, He Wang, Xinzhe Du, Zhen Luo, Yuchen Wang, Weiping Bai, Xingsong Su, Shengchun Shen, Yuewei Yin, Xiaoguang Li
Summary: In this work, the ferroelectric endurance properties of Hf0.5Zr0.5O2 (HZO) film under various pulse voltages and pulse widths were systematically investigated. It was found that the fatigue severity initially increases and then decreases with increasing pulse voltage or width. Our work provides a universal way to weaken fatigue and improve endurance performance of HfO2-based ferroelectric random access memory devices.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Song Ding, Zhiwei Bao, Yiwei Wang, Zhizhan Dai, Jiangheng Jia, Shengchun Shen, Yuewei Yin, Xiaoguang Li
Summary: Current commercial dielectric polymers cannot meet the increasing demand for advanced capacitors under harsh thermal conditions. In this study, we designed and prepared all-organic polyetherimide/poly(arylene ether urea) polymer blend films, which achieved a record-high discharged energy density with high efficiency at 150 degrees C. These films also exhibited excellent temperature stability and long-term reliability under working conditions of hybrid vehicles. The introduction of molecular trapping centers greatly reduced high-temperature conduction loss, contributing to the excellent dielectric energy storage performances.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Multidisciplinary
Zhiwei Bao, Song Ding, Zhizhan Dai, Yiwei Wang, Jiangheng Jia, Shengchun Shen, Yuewei Yin, Xiaoguang Li
Summary: This study demonstrates a convenient and competitive strategy of preparing ultraviolet-irradiated cyclic olefin copolymer films to improve the energy storage performance at high temperatures. The irradiated films show higher dielectric constant, breakdown strength, and mechanical properties compared to the unirradiated film, resulting from the emergence of carbonyl groups and a cross-linking network. As a result, a superior discharged energy density of approximately 3.34 J cm(-3) is achieved at 150 degrees C, surpassing current dielectric materials. This research provides a valuable pathway for high-energy-density polymer-based capacitor devices in harsh environments.
MATERIALS HORIZONS
(2023)
