Article
Chemistry, Inorganic & Nuclear
Hui Wang, Yang Zhang, Koki Tachiyama, Zhaoyang Xia, Jinghong Fang, Qin Li, Guofeng Cheng, Yun Shi, Jianding Yu, Tsukasa Katayama, Shintaro Yasui, Mitsuru Itoh
Summary: GaFeO3-type iron oxides are promising multiferroics with large spontaneous magnetization and polarization, but the difficulties in synthesizing single crystals and high leakage current have hindered achieving key features in the system. By doping Sc into GaFeO3 single crystals, features such as reduced leakage current, large ferroelectric polarization switching, and magnetoelectric coupling have been successfully achieved, demonstrating the potential of multiferroics.
INORGANIC CHEMISTRY
(2021)
Article
Optics
Tianxiang Dai, Yutian Ao, Jueming Bao, Jun Mao, Yulin Chi, Zhaorong Fu, Yilong You, Xiaojiong Chen, Chonghao Zhai, Bo Tang, Yan Yang, Zhihua Li, Luqi Yuan, Fei Gao, Xiao Lino, Mark G. Thompson, Jeremy L. O'Brien, Yan Li, Xiaoyong Hu, Qihuang Gong, Jianwei Wang
Summary: This research reports on a device that can emit topologically protected entangled states in a natural environment. The device achieves this by performing four-wave mixing on edge modes, generating up to four-photon topological protected entangled states on a monolithically integrated silicon photonic chip.
Article
Chemistry, Multidisciplinary
Alireza Jalouli, Shenqiang Ren
Summary: Incorporating molecular magnets and molecular ferroelectrics allows for the achievement of magnetoelectric effect at room temperature, a topic of interest in materials science. Experimental results showed that applying an electric field to the composite material led to about 6% change in magnetization at room temperature, and a shift in the resonance magnetic field in ferromagnetic resonance measurement.
Article
Nanoscience & Nanotechnology
Adrian Begue, Miguel Ciria
Summary: This study demonstrates a structure with a giant magnetoelectric coupling coefficient, showing a value of 15 x 10(-6) s m(-1) at room temperature, which is a 2-fold increment over the previous highest value. The structure can switch the spatial orientation of the magnetization vector with the application of an electric field and exhibits switchable uniaxial magnetoelastic anisotropy, making it ideal for low-energy-consuming spintronic applications.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Applied
Guoliang Yuan, Rukai Xu, Hanzhou Wu, Yisong Xing, Chen Yang, Rui Zhang, Wenbin Tang, Yiping Wang, Yaojin Wang
Summary: Magnetoelectric (ME) sensors are important tools for detecting weak magnetic fields, but there are currently no high-quality ME sensors available for high-temperature environments. By bonding a specific piezoelectric ceramic and alloy together using an inorganic glue, a high-temperature ME sensor with excellent piezoelectric performance and maximum stress was achieved. The sensor also exhibited high magnetic field detecting precision at different temperatures.
APPLIED PHYSICS LETTERS
(2022)
Article
Multidisciplinary Sciences
Tong Zhu, Fabio Orlandi, Pascal Manuel, Alexandra S. Gibbs, Weiguo Zhang, P. Shiv. Halasyamani, Michael A. Hayward
Summary: By conducting low-temperature cation-exchange reactions on Li2SrTa2O7, researchers successfully synthesized a material, MnSrTa2O7, demonstrating simultaneous spontaneous magnetic and electrical polarisations. At low temperatures, the material exhibits complex magnetic and structural transitions.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Toni Annala, Roberto Zamora-Zamora, Mikko Mottonen
Summary: This study presents research on topological knots and linked structures, constructs topologically protected links that cannot be untied through local reconnections, and proposes a classification scheme for topological vortex links.
COMMUNICATIONS PHYSICS
(2022)
Article
Physics, Multidisciplinary
Yang Chen, Xin-Tao He, Yu-Jie Cheng, Hao-Yang Qiu, Lan-Tian Feng, Ming Zhang, Dao-Xin Dai, Guang-Can Guo, Jian-Wen Dong, Xi-Feng Ren
Summary: The researchers designed and fabricated nanophotonic topological harpoon-shaped beam splitters based on 120-deg-bending interfaces, demonstrating the first on-chip valley-dependent quantum information process. They achieved two-photon quantum interference with high visibility, showcasing a novel approach to on-chip quantum information processing through utilizing photonic valley states.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Fluids & Plasmas
Guido Baardink, Gino Cassella, Luke Neville, Paul A. Milewski, Anton Souslov
Summary: The study reveals a method of capturing energy using interface design, by simulating a model system of two topological fluids to show the disappearance of chiral edge states and explore the interaction between topology and energy dissipation.
Article
Multidisciplinary Sciences
Christina M. Spaegele, Michele Tamagnone, Soon Wei Daniel Lim, Marcus Ossiander, Maryna L. Meretska, Federico Capasso
Summary: Optical singularities are widely used in modern optics for applications such as structured light, superresolution microscopy, and holography. In this study, we demonstrate a complete and topologically protected polarization singularity that is created in the focus of a cascaded metasurface-lens system. This singularity, located in a four-dimensional space, opens up possibilities for unconventional applications in topological photonics and precision sensing.
Article
Materials Science, Multidisciplinary
Shumpei Fujii, Takamasa Usami, Yu Shiratsuchi, Adam M. Kerrigan, Amran Mahfudh Yatmeidhy, Shinya Yamada, Takeshi Kanashima, Ryoichi Nakatani, Vlado K. Lazarov, Tamio Oguchi, Yoshihiro Gohda, Kohei Hamaya
Summary: Research shows that electric-field control can be used to control the magnetization vectors of ferromagnetic electrodes in multiferroic heterostructures. By combining the ferromagnetic Heusler alloy Co2FeSi with the ferroelectric oxide Pb(Mg1/3Nb2/3)O-3-PbTiO3 (PMN-PT), nonvolatile and repeatable magnetization vector switchings can be achieved. This approach has the potential to reduce write power in spintronic memory architectures.
NPG ASIA MATERIALS
(2022)
Article
Physics, Applied
Athinarayanan Sundaresan, N. V. Ter-Oganessian
Summary: Over the last two decades, significant progress has been made in combining ferroelectricity and magnetism in the same material, particularly through the discovery of spin-induced ferroelectricity with strong coupling between magnetism and electric polarization, which is determined by the symmetries of the crystal lattice and magnetic structure.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Seou Choi, Jungmin Kim, Jeonghun Kwak, Namkyoo Park, Sunkyu Yu
Summary: A building block is proposed for all-optical transition between topologically protected memory states, enabling the design of all-optical in-memory processors with stable memory states.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Physical
A. Plyushch, D. Lewin, A. Sokal, R. Grigalaitis, V. V. Shvartsman, J. Macutkevic, S. Salamon, H. Wende, K. N. Lapko, P. P. Kuzhir, D. C. Lupascu, J. Banys
Summary: Bulk BaTiO3-xCoFe2O4 (x = 0.1 - 0.6) magnetoelectric composites with high purity and excellent dielectric and magnetic properties were prepared using the phosphate bonded ceramics approach. The dielectric properties were influenced by composition-dependent relaxations and anomalies at different frequencies, while the magnetic properties were limited by the size of CoFe2O4 particles. The measured direct magnetoelectric coupling coefficient was higher than that of conventionally sintered ceramics and comparable to that of core-shell structures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Sukhendu Sadhukhan, Abhik S. Mahapatra, Ayan Mitra, Pabitra K. Chakrabarti
Summary: Nanocrystalline holmium orthoferrite (HoFeO3) was synthesized using the chemical sol-gel technique. Structural investigation and magnetization measurements revealed its multiferroic behavior, establishing its candidacy for multiferroic applications in M-E devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Yu Pang, Yongheng Li, Ziyan Gao, Xin Qian, Xueyun Wang, Jiawang Hong, Puqing Jiang
Summary: In this study, the thermal conductivity of h-ErMnO3 single crystals with different vortex domain walls (DWs) was investigated using time-domain thermoreflectance (TDTR). It was found that the vortex DWs can effectively suppress the thermal conductivity along and perpendicular to the c-axis of the crystals. A phonon scattering model was used to explain the mechanism of thermal transport manipulated by the vortex DWs. These findings not only provide an essential understanding of heat transport in multiferroics with vortex DWs but also pave the way for their application in next-generation ferroelectric devices.
MATERIALS TODAY PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Seung-Hwan Do, Hao Zhang, David A. Dahlbom, Travis J. Williams, V. Ovidiu Garlea, Tao Hong, Tae-Hwan Jang, Sang-Wook Cheong, Jae-Hoon Park, Kipton Barros, Cristian D. Batista, Andrew D. Christianson
Summary: This study tests the hypothesis that N-level systems with strong single-ion anisotropy can be described by a classical approximation based on SU(N) coherent states. The finite temperature inelastic neutron scattering data of the spin-one antiferromagnet Ba2FeSi2O7 is modeled using a generalized Landau-Lifshitz dynamics for SU(3) spins. Unlike the traditional classical limit based on SU(2) coherent states, the results obtained with classical SU(3) spins show good agreement with the measured temperature dependent spectrum. The developed SU(3) approach provides a general framework to understand a broad class of materials with weakly coupled antiferromagnetic dimers, trimers, or tetramers, and magnets with strong single-ion anisotropy.
NPJ QUANTUM MATERIALS
(2023)
Article
Physics, Applied
K. Park, J. Kim, S. Choi, S. Fan, C. Kim, D. G. Oh, N. Lee, S. -W Cheong, V. Kiryukhin, Y. J. Choi, D. Vanderbilt, J. H. Lee, J. L. Musfeldt
Summary: To explore the effects of spin-orbit coupling on spin-phonon interactions, we studied the infrared vibrational properties of chemically similar mixed metal oxides. Our findings showed significant shifts in the Co2+ shearing mode near 150 cm(-1) across the magnetic ordering temperature. These shifts were especially large in relative terms. The spin-phonon coupling constants were derived from interlayer exchange interactions and contained competing antiferromagnetic and ferromagnetic contributions.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Jiaqian Kang, Ziyan Gao, Changqing Guo, Wenfu Zhu, Houbing Huang, Jiawang Hong, Sang-Wook Cheong, Xueyun Wang
Summary: Hexagonal manganites display three distinct domain patterns: stripe, loop, and vortex. The formation and evolution of vortex networks is still a mystery due to high ferroelectric phase transition temperature and a lack of reliable visualization methods. In this study, by precisely controlling the annealing temperature at T-c, we observed the coexistence of vortices, loops, and stripes. We proposed a merging process between the V-AV pair and the stripe, resulting in two different forms of vortex networks: normal vortex and zigzag vortex. Additionally, the connection between stripe density and V-AV pair orientation, both influenced by crystal self-straining, was analyzed. Capturing this snapshot and providing the experimental database calls for further analysis to understand the evolution of different domain topologies.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Qi Ren, Yingzhuo Lun, Yongheng Li, Ziyan Gao, Jianming Deng, Xueyun Wang, Gang Tang, Jiawang Hong
Summary: In this paper, a simple deformability factor consisting of only elastic constants was proposed for high-throughput screening of possible deformable inorganic semiconductors. Through data mining, 99 types of layered materials with high deformability factors were screened out from more than 40,000 materials. The results indicated that the heavy metal halide family generally possesses a high deformability factor. The deformability of the selected material PbI2 was further experimentally verified. This simple factor could be used to rapidly predict the deformability of layered materials and screen candidate inorganic materials for next-generation deformable and flexible electronic devices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Multidisciplinary Sciences
Xiaolei Wang, Zixuan Shang, Chen Zhang, Jiaqian Kang, Tao Liu, Xueyun Wang, Siliang Chen, Haoliang Liu, Wei Tang, Yu-Jia Zeng, Jianfeng Guo, Zhihai Cheng, Lei Liu, Dong Pan, Shucheng Tong, Bo Wu, Yiyang Xie, Guangcheng Wang, Jinxiang Deng, Tianrui Zhai, Hui-Xiong Deng, Jiawang Hong, Jianhua Zhao
Summary: Manipulating electrical and magnetic anisotropies has been demonstrated in van der Waals multiferroic CuCrP2S6, with axis dependence of current rectifications, magnetic properties and magnon modes. The discovery of spin-flop transition and determination of anisotropy parameters by consistent model fittings and theoretical calculations provide in-depth investigation and quantitative analysis, stimulating potential device applications in artificial bionic synapses, multi-terminal spintronic chips, and magnetoelectric devices.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Kai Du, Xianghan Xu, Choongjae Won, Kefeng Wang, Scott A. Crooker, Sylvie Rangan, Robert Bartynski, Sang-Wook Cheong
Summary: Researchers have discovered surface magnetism in Cr2O3 and other linear magnetoelectric antiferromagnets, which allows for simple tuning of the internal magnetization of antiferromagnetic materials by controlling the surface magnetism. This study provides a new approach for the development of high-density ultra-fast spintronic technologies.
NPJ QUANTUM MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Kai Du, Fei-Ting Huang, Kasun Gamage, Junjie Yang, Maxim Mostovoy, Sang-Wook Cheong
Summary: The study demonstrates the reversible strain control of cycloidal spin textures in a metallic van der Waals magnet, Cr1/3TaS2, through the modulation of polarization and DMI induced by strain. The sign and wavelength of the cycloidal spin textures can be systematically manipulated with thermally-induced biaxial strains and isothermally-applied uniaxial strains, respectively. Furthermore, unprecedented reflectivity reduction under strain and domain modification at a record-low current density are also discovered.
ADVANCED MATERIALS
(2023)
Article
Physics, Applied
Myung-Geun Han, Joseph Garlow, Kai Du, Sang-Wook Cheong, Yimei Zhu
Summary: Ferromagnetism in 2D materials is a promising platform for studying emergent electromagnetic phenomena in low dimensions for spintronics applications. In this study, the chirality reversal behavior of chiral soliton lattices in Cr1/3TaS2 across structural defects was directly observed using cryogenic Lorentz phase microscopy. The manipulation of stacking sequence in 2H-TaS2 was shown to locally reduce the antisymmetric exchange interaction, leading to magnetic chirality reversal with direct atomic resolution imaging. These findings highlight the potential of controlling the chirality of topologically nontrivial soliton lattices in 2D magnets through stack engineering.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Kai Du, Xiaochen Fang, Choongjae Won, Chandan De, Fei-Ting Huang, Wenqian Xu, Hoydoo You, Fernando J. Gomez-Ruiz, Adolfo del Campo, Sang-Wook Cheong
Summary: The Kibble-Zurek mechanism describes the non-equilibrium dynamics of second-order phase transitions and predicts a power-law relationship between cooling rates and topological defect density. This mechanism has been verified in various physical systems. However, it is unclear if it is valid for topologically trivial Ising domains. This study shows that the cooling rate dependence of Ising domain density follows the KZM power law in two different three-dimensional Ising domains, but with some modifications due to long-range dipolar interactions.
Article
Physics, Multidisciplinary
Taek Sun Jung, Xianghan Xu, Jaewook Kim, Beom Hyun Kim, Hyun Jun Shin, Young Jai Choi, Eun-Gook Moon, Sang-Wook Cheong, Jae Hoon Kim
Summary: Previous research has suggested that TbInO3 exhibits unconventional quantum behavior at very low temperatures. However, new experiments using terahertz time-domain spectroscopy show that these exotic effects can persist at room temperature. This challenges the common belief that such phenomena can only be observed at low temperatures. The findings confirm the presence of emergent carriers within the Mott charge gap of TbInO3, indicating the potential for probing and manipulating highly entangled quantum many-body states even at room temperature.
Article
Nanoscience & Nanotechnology
Jose P. B. Silva, Ruben Alcala, Uygar E. Avci, Nick Barrett, Laura Begon-Lours, Mattias Borg, Seungyong Byun, Sou-Chi Chang, Sang-Wook Cheong, Duk-Hyun Choe, Jean Coignus, Veeresh Deshpande, Athanasios Dimoulas, Catherine Dubourdieu, Ignasi Fina, Hiroshi Funakubo, Laurent Grenouillet, Alexei Gruverman, Jinseong Heo, Michael Hoffmann, H. Alex Hsain, Fei-Ting Huang, Cheol Seong Hwang, Jorge Iniguez, Jacob L. Jones, Ilya V. Karpov, Alfred Kersch, Taegyu Kwon, Suzanne Lancaster, Maximilian Lederer, Younghwan Lee, Patrick D. Lomenzo, Lane W. Martin, Simon Martin, Shinji Migita, Thomas Mikolajick, Beatriz Noheda, Min Hyuk Park, Karin M. Rabe, Sayeef Salahuddin, Florencio Sanchez, Konrad Seidel, Takao Shimizu, Takahisa Shiraishi, Stefan Slesazeck, Akira Toriumi, Hiroshi Uchida, Bertrand Vilquin, Xianghan Xu, Kun Hee Ye, Uwe Schroeder
Summary: Ferroelectric hafnium and zirconium oxides have shown significant progress in ultralow-power electronic systems, but technical limitations still hinder their application. This article aims to provide a comprehensive overview of the current state, challenges, and prospects for the development of these materials, with the collaboration of experts from different fields.
Article
Chemistry, Physical
Ziyan Gao, Xiaoyu Feng, Ke Qu, Junyan Liu, Yingzhuo Lun, Rong Huang, Sang-Wook Cheong, Jiawang Hong, Xueyun Wang
Summary: This study systematically investigated the Young's moduli of YMnO3, ErMnO3, and LuMnO3 single crystals using nanoindentation and density functional theory calculations. The results showed that lattice distortion plays a key role in resisting deformation, which is the origin of the abnormal mechanical behavior observed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)