Article
Nanoscience & Nanotechnology
Huihui Ji, Guowei Zhou, Xiaojiao Wang, Jun Zhang, Penghua Kang, Xiaohong Xu
Summary: This study demonstrates the reversible control of exchange coupling transition in oxide heterostructures using electric field technology. Different magnetic effects were observed in SrCoO3-x/LSMO bilayers under different oxidation states, and the impact of stacking order on magnetic properties was investigated.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Ke Chang, Anhua Dong, Xinna Yu, Binbin Liu, Xinhui Zhao, Renzhi Wang, Zhikai Gan, Kang'an Jiang, Yiru Niu, Xinyuan Dong, Diyuan Zheng, Yizhen Li, Peng Bao, Zhuyikang Zhao, Hui Wang
Summary: By utilizing Ag-doped fibroin film as a switching medium, a high-performance transient memristor with self-assembled Ag nanoclusters model is designed and fabricated, showing novel electron-transport properties. The device can operate at ultralow voltages and has an extremely high memory window, opening up a new pathway for designing high-performance transient memristors for a safe and reliable data storage system.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Physical
Hongyan Qi, Weixin Wu, Xinqi Chen, Hee Chul Lee
Summary: In this study, BiFeO3/La0.7Sr0.3MnO3 heterostructures were successfully synthesized and stable bipolar resistive switching characteristics regulated by ferroelectric polarization reversal were observed. The conduction mechanism followed the Schottky emission model, and the memristive behavior was explained by the modulation effect on the depletion region width and Schottky barrier height caused by ferroelectric polarization reversal.
Article
Physics, Applied
David Sanchez-Manzano, S. Mesoraca, F. Cuellar, M. Cabero, S. Rodriguez-Corvillo, V Rouco, F. Mompean, M. Garcia-Hernandez, J. M. Gonzalez-Calbet, C. Feuillet-Palma, N. Bergeal, J. Lesueur, C. Leon, Javier E. Villegas, J. Santamaria
Summary: The recent discovery of a long-range unconventional Josephson effect between YBa2Cu3O7 high Tc cuprates separated by a manganite ferromagnet has revealed a novel triplet proximity effect. The temperature dependence of the critical current in planar Josephson junctions was examined, and it was found that the behavior of the critical current follows the predictions of traditional superconductor-normal metal-superconductor junctions, suggesting that triplet pairs in a ferromagnet are transported similarly to singlet pairs in a normal metal. This result calls for theoretical studies of the new triplet Josephson effect and highlights its potential in future superconducting spintronics.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Kelan Yan, Liming Shen, Runhua Fan, Ningzhong Bao
Summary: Tailoring of electromagnetic parameters through Co doping in single-phase La0.7Sr0.3MnO3 has resulted in both plasma-like negative permittivity and tunable negative susceptibility, with the potential for high capacitance capacitors for integrated circuits. The frequency dispersion of negative permittivity in LSMO is in agreement with the Drude model, while the positive permittivity increases with higher Co content. Tunable negative susceptibility has been observed in both LSMO and LSCO samples, indicating a wide adjustment range of permittivity and the development of negative electromagnetic materials.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Shantanu Majumder, Karuna Kumari, S. J. Ray
Summary: This study reveals the robust and reversible unipolar electric pulse-induced resistance switching effects in copper iodide and La0.7Sr0.3MnO3 nanocomposites. The charge transport mechanisms are identified as Schottky emission and Poole-Frenkel effect, while the resistive switching performance shows stability over 1000 cycles of square electrical pulse train measurement.
Article
Engineering, Electrical & Electronic
Jing Ni, Yan Zhang, Jun Li, Yong Ren, Jun Zhou, Bo Dai
Summary: Magnetoelectric coupling is of crucial importance for information storage, and electric control of exchange bias is a typical method. However, achieving electric control of exchange bias at zero magnetic field and room temperature remains a challenge. In this study, a resistance device based on NiO film was prepared, and applying voltage in the vertical direction led to a low resistance state and decreased exchange bias field at room temperature. The nonvolatile change was primarily attributed to the effect of electron capture by defective oxygen vacancy. This research provides a potential method for full electric control of magnetization and exploration of exchange bias mechanism.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
I-Hsuan Kao, Ryan Muzzio, Hantao Zhang, Menglin Zhu, Jacob Gobbo, Sean Yuan, Daniel Weber, Rahul Rao, Jiahan Li, James H. Edgar, Joshua E. Goldberger, Jiaqiang Yan, David G. Mandrus, Jinwoo Hwang, Ran Cheng, Jyoti Katoch, Simranjeet Singh
Summary: This paper demonstrates the experimental realization of field-free deterministic magnetic switching using the out-of-plane antidamping spin-orbit torque in the quantum material WTe2, and confirms this phenomenon through numerical simulations. This is of great importance for next-generation spintronic applications.
Article
Chemistry, Physical
Fanghua Tian, Yebei Li, Qizhong Zhao, Kaiyan Cao, Dingchen Wang, Zhiyong Dai, Zhonghai Yu, Xiaoqin Ke, Yin Zhang, Chao Zhou, Wenliang Zuo, Sen Yang, Xiaoping Song
Summary: A giant exchange bias of 9600 Oe was observed in polycrystalline Fe3O4/CoO layers at 10 K after 20 kOe field cooling, attributed to the strong exchange coupling formed by the interfacial spins. The interfacial spins can be tuned by the cooling field, influencing the magnitude of the exchange bias effect.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Multidisciplinary Sciences
Seung Gyo Jeong, Jiwoong Kim, Ambrose Seo, Sungkyun Park, Hu Young Jeong, Young-Min Kim, Valeria Lauter, Takeshi Egami, Jung Hoon Han, Woo Seok Choi
Summary: Chiral symmetry breaking of phonons plays a crucial role in emergent quantum phenomena due to its strong coupling to spin degree of freedom. In this study, a chiral phonon-mediated interlayer exchange interaction was reported in atomically controlled ferromagnetic metal-nonmagnetic insulator heterostructures, resulting in spin rotation and a spin spiral state. The existence of chiral phonons and their interplay with spins in magnetic materials were confirmed through the phonon Zeeman effect and atomic-scale heterostructure approach.
Article
Materials Science, Ceramics
Xixi Ren, Guoqiang Tan, Jincheng Li, Di Ao, Chenjun Liu, Huijun Ren, Ao Xia, Wenlong Liu
Summary: Bi(0.89)Ho(0.08)Sr(0.03)Fe(0.97-x)Mn(0.03)Nia/bO(3)/La0.7Sr0.3MnO3(BiFeO3-Ni-a/b/LSMO) films with ferroelectric polarization and resistance switching behavior were successfully prepared using the wet chemical method. The structural changes influenced the interface conductivity and polarization, resulting in improved resistance switching behavior. The Ni-0.03/(0.01)/LSMO film exhibited significant ferroelectric polarization differences under different electric fields, achieving a high resistance switching ratio. The BiFeO3-Ni-a/b/LSMO superlattice composite film enabled the multifunctionalization of BiFeO3 films.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Mingwei Yang, Kuijuan Jin, Hongbao Yao, Qinghua Zhang, Yiru Ji, Lin Gu, Wenning Ren, Jiali Zhao, Jiaou Wang, Er-Jia Guo, Chen Ge, Can Wang, Xiulai Xu, Qiong Wu, Guozhen Yang
Summary: Various emergent phenomena are enabled by interface engineering in complex oxides heterostructures. Different magnetic behaviors, including ferromagnetic coupling, are observed in differently thick LMO films epitaxially deposited on substrates, shedding new lights on manipulating oxides functionality.
Article
Chemistry, Physical
Lama Rifai, Farah Fattouh, Khulud Habanjar, Nader Yaacoub, Ramadan Awad
Summary: Nanopowders of BaFe12O19 and CoFe2O4, as well as nanocomposites of (1-x) BaFe12O19/xCoFe(2)O(4) with varying compositions, were prepared using co-precipitation and high-speed ball milling techniques. Structural analysis showed well-distributed phases with small crystallite sizes. Magnetic measurements indicated good exchange coupling between hard and soft phases, with optimum magnetic properties achieved at x = 0.5. Cooling the temperature from room temperature to 77 K improved the magnetic properties of the nanocomposites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
R. S. Silva, C. Santos, M. T. Escote, B. F. O. Costa, N. O. Moreno, S. P. A. Paz, R. S. Angelica, N. S. Ferreira
Summary: In this study, a B-site disordered double perovskite material was synthesized and found to exhibit unique magnetic properties and magnetocaloric coupling. Experimental results demonstrated the significant influence of the distribution of iron and cobalt ions on the material's magnetism.
Article
Physics, Multidisciplinary
Jia Xu, Jing Xia, Xichao Zhang, Chao Zhou, Dong Shi, Haoran Chen, Tong Wu, Qian Li, Haifeng Ding, Yan Zhou, Yizheng Wu
Summary: We experimentally demonstrate that the switching rate of the antiferromagnetic (AFM) domain can be significantly enhanced by more than 2 orders of magnitude through applying an alternating square-wave field on a Fe/CoO bilayer. This finding opens up new opportunities for designing antiferromagnet-based spintronic devices.
PHYSICAL REVIEW LETTERS
(2022)
Article
Instruments & Instrumentation
Michael Guevara De Jesus, Zhuyun Xiao, Maite Goiriena-Goikoetxea, Rajesh Chopdekar, Mohanchandra K. Panduranga, Paymon Shirazi, Adrian Acosta, Jane P. Chang, Jeffrey Bokor, Gregory P. Carman, Rob N. Candler, Christopher Lynch
Summary: This work demonstrates the design of magnetoelectric composite heterostructures at a small scale and the ability to switch them from a magnetized state to a vortex state using electric field induced strain. Experimental and simulation results provide insight into the behavior and performance of these heterostructures.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Chemistry, Multidisciplinary
Mengying Bian, Liang Zhu, Xiao Wang, Junho Choi, Rajesh Chopdekar, Sichen Wei, Lishu Wu, Chang Huai, Austin Marga, Qishuo Yang, Yuguang C. Li, Fei Yao, Ting Yu, Scott A. Crooker, Xuemei M. Cheng, Renat F. Sabirianov, Shengbai Zhang, Junhao Lin, Yanglong Hou, Hao Zeng
Summary: Realizing van der Waals (vdW) epitaxy provides a breakthrough in circumventing the stringent lattice matching and processing compatibility requirements in conventional covalent heteroepitaxy. This study reports the epitaxial growth of covalent Cr5Te8 2D crystals on vdW WSe2, driven by interfacial dative bond formation. The concept of dative epitaxy is established, which combines the advantages of covalent epitaxy and vdW epitaxy while overcoming their limitations.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Shenli Zhang, I-Ting Chiu, Min-Han Lee, Brandon Gunn, Mingzhen Feng, Tae Joon Park, Padraic Shafer, Alpha T. N'Diaye, Fanny Rodolakis, Shriram Ramanathan, Alex Frano, Ivan K. Schuller, Yayoi Takamura, Giulia Galli
Summary: The oxygen vacancy concentration in cobaltites can be determined by the change in O K-edge XA spectra peak positions. The variation of Co-O bond length and Co-O-Co bond angle is also correlated with the presence of oxygen vacancies. The resistivity of the oxide material can be modified by adjusting the defect concentration, without any structural transformation.
CHEMISTRY OF MATERIALS
(2022)
Article
Physics, Condensed Matter
Guanhua Hao, Ashley S. Dale, Alpha T. N'Diaye, Rajesh Chopdekar, Roland J. Koch, Xuanyuan Jiang, Corbyn Mellinger, Jian Zhang, Ruihua Cheng, Xiaoshan Xu, Peter A. Dowben
Summary: Compact domain features were observed in spin crossover [Fe{H2B(pz)(2)}(2)(bipy)] molecular thin film systems. Monte Carlo simulations support the presence of intermolecular interactions that can be described by a two-dimensional Ising model. These interactions contribute to the formation of largely high spin state domain structure.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Physics, Multidisciplinary
Hilal Saglam, Ayhan Duzgun, Aikaterini Kargioti, Nikhil Harle, Xiaoyu Zhang, Nicholas S. Bingham, Yuyang Lao, Ian Gilbert, Joseph Sklenar, Justin D. Watts, Justin Ramberger, Daniel Bromley, Rajesh V. Chopdekar, Liam O'Brien, Chris Leighton, Cristiano Nisoli, Peter Schiffer
Summary: This paper introduces the phenomenon of long-range ordering driven by increasing entropy in certain special cases of artificial spin-ice arrays. Taking the tetris artificial spin-ice structure as an example, two-dimensional magnetic ordering is achieved by creating regular vacancies on the square ice lattice. Unlike other systems, tetris artificial spin ice has binary and observable discrete degrees of freedom, and the system's entropy can be precisely calculated in simulations.
Article
Physics, Applied
Dayne Y. Sasaki, Rajesh Chopdekar, Scott T. Retterer, Daniel Y. Jiang, Jeremy K. Mason, Michael S. Lee, Yayoi Takamura
Summary: This study investigates the stabilization of complex spin textures in thermally demagnetized artificial spin ice arrays through an appropriate selection of nanoisland width and interisland spacing. Micromagnetic simulations reveal the role of interisland dipolar interactions in the formation of these spin textures.
PHYSICAL REVIEW APPLIED
(2022)
Article
Materials Science, Multidisciplinary
Xiao Wang, Alexandra R. Stuart, Mitchell S. Swyt, Carla M. Quispe Flores, Andy T. Clark, Adzo Fiagbenu, Rajesh V. Chopdekar, Pavel N. Lapa, Zhuyun Xiao, Dava Keavney, Richard Rosenberg, Michael Vogel, John E. Pearson, Suzanne G. E. te Velthuis, Axel Hoffmann, Kristen S. Buchanan, Xuemei M. Cheng
Summary: The study reveals a topological spin memory effect in AFM-coupled skyrmion pairs, providing insight into a key aspect of topological protection and offering a promising avenue for information encryption and recovery.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Patrick Quarterman, Yabin Fan, Zhijie Chen, Christopher J. Jensen, Rajesh V. Chopdekar, Dustin A. Gilbert, Megan E. Holtz, Mark D. Stiles, Julie A. Borchers, Kai Liu, Luqiao Liu, Alexander J. Grutter
Summary: Using depth- and element-resolved characterization, this study investigates the antiferromagnetic coupling in Y3Fe5O12/permalloy and Y3Fe5O12/Co thin-film heterostructures. The results reveal that the choice of ferromagnet, seed layer, and substrate influences the sample structure and magnetic properties, leading to notable changes in interface coupling sign, magnetic reversal mechanisms, magnetic depth profiles, and domain structure.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Physics, Applied
Mingzhen Feng, Nolan J. Ahlm, Alexander M. Kane, I-Ting Chiu, Dayne Y. Sasaki, Padraic Shafer, Alpha T. N'Diaye, Apurva Mehta, Yayoi Takamura
Summary: The magnetic properties and interfacial phenomena of epitaxial perovskite oxide films are highly sensitive to parameters such as film thickness and strain state. In this study, it was found that magnetically active Co2+ ions appeared in the bilayer films under certain conditions, depending on the thickness of the LSCO layer and the substrate material. These findings contribute to the understanding of the interfacial exchange spring behavior and have implications for applications in spintronics and magnetic memory devices.
JOURNAL OF APPLIED PHYSICS
(2022)
Editorial Material
Nanoscience & Nanotechnology
Yayoi Takamura
Article
Materials Science, Multidisciplinary
D. Samal, Nicolas Gauquelin, Yayoi Takamura, Ivan Lobato, Elke Arenholz, Sandra Van Aert, Mark Huijben, Zhicheng Zhong, Jo Verbeeck, Gustaaf Van Tendeloo, Gertjan Koster
Summary: Epitaxial stabilization of thermodynamically metastable phases and advances in atomic control of complex oxide thin-film growth can be used to realize novel phenomena. In this study, infinite layer (IL) based cuprate superlattices were investigated, and it was found that only the [SCCO/BCO] superlattice (SL) exhibited superconductivity, while the insertion of an STO spacer layer prevented superconductivity. The unexpected structure of BCO was unraveled, which contributes to understanding the superconductivity in [SCCO/BCO] SL.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Mingzhen Feng, Nolan Ahlm, Dayne Y. Sasaki, I-Ting Chiu, Alpha T. N'Diaye, Padraic Shafer, Christoph Klewe, Apurva Mehta, Yayoi Takamura
Summary: This work explores the effect of adjusting the thickness of La2/3Sr1/3CoO3 (LSCO) and La2/3Sr1/3MnO3 (LSMO) layers on the magnetocrystalline anisotropy and exchange bias in epitaxial LSCO/LSMO bilayers. The results show significant variations in the easy axis direction and exchange coupling between LSCO and LSMO layers at different thicknesses.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Applied
Adam Whitney, Chuanpu Liu, Tiffany S. Santos, Rajesh Chopdekar, Matthew Carey, Galen Street, Vijaysankar Kalappattil, Keira Leistikow, Mingzhong Wu
Summary: This study compares high-temperature ferromagnetic resonance (FMR) in two types of STT MRAM free layers - a low-α free layer with split W layers and a conventional free layer with a single W layer. The results show that the damping constant of the low-α free layer is always smaller than that of the conventional free layer, and both damping constants increase with temperature. The findings confirm the technological advantage of the low-α free layer for STT MRAM applications and provide important insights into the temperature dependence and line broadening in the free layers.
PHYSICAL REVIEW APPLIED
(2023)
Article
Materials Science, Multidisciplinary
Pavel Salev, Iana Volvach, Dayne Sasaki, Pavel Lapa, Yayoi Takamura, Vitaliy Lomakin, Ivan K. Schuller
Summary: The discovery of new mechanisms for controlling magnetic properties using electric fields or currents provides a deeper understanding of magnetism and has important practical implications. In this study, we propose a method of using resistive switching to control magnetic anisotropy. We investigate a ferromagnetic oxide that undergoes an electrically triggered metal-to-insulator phase transition, resulting in volatile resistive switching. Our results demonstrate that resistive switching is an effective tool for manipulating magnetic properties and could lead to the development of a new class of voltage-controlled magnetism systems.
