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Vibrational mode of low-dimensional ionic liquid bismuth hybrid perovskite probed by FTIR and Raman Spectroscopy

Materials Today: Proceedings 2024年

作者： Sri Hartati Budi Zahara Pramitha Yuniar Diah Maulida Khairunnisa Zulfa Afif Akmal Afkauni Riki Subagyo Lina Jaya Diguna Azis Yudhowijoyo Muhammad Haris Mahyuddin Muhammad Danang Birowosuto Yuly Kusumawati Arramel Center of Excellence Applied Physics and Chemistry Nano Center Indonesia Jl PUSPIPTEK South Tangerang Banten 15314 Indonesia Department of Chemistry Faculty of Mathematics and Natural Sains Universitas Negeri Padang Jl. Prof. Dr. Hamka Air Tawar Barat Padang Utara Padang 25173 Indonesia Department of Chemistry Faculty of Science and Data Analytics Institut Teknologi Sepuluh Nopember Kampus ITS Keputih Sukolilo Surabaya 60111 Indonesia Department of Renewable Energy Engineering Universitas Prasetiya Mulya Kavling Edutown I.1 Jl. BSD Raya Utama BSD City Tangerang 15339 Indonesia Research Group of Advanced Functional Materials Faculty of Industrial Technology Institut Teknologi Bandung Bandung 40132 Indonesia Research Center for Nanoscience and Nanotechnology Institut Teknologi Bandung Bandung 40132 Indonesia Łukasiewicz Research Network—PORT Polish Center for Technology Development Stabłowicka 147 54-066 Wrocław Poland

Bismuth-based hybrid organic-inorganic perovskites (Bi-HOIPs) are developed as lead-free halide perovskites due to their low toxicity and good stability. In this study, the incorporation of ionic liquid (IL) cations in the Bi-HOIPs structure, namely 1-butyl-1-methylpyrrolidinium (BMP) and 1-(3-aminopropyl) imidazole (API), are investigated. Bi-based HOIPs are kept in ambient conditions (20–25 °C) to compare the structural differences in FTIR and Raman spectra between pristine and aged samples. The FTIR and Raman spectra of all aged samples are slightly shifted after being retrieved at the ambient conditions for four months (∼below 45 cm −1 ). Our work paves the way in developing Bi-based HOIPs for solar cells and photodetectors applications.

关键词： HOIPs Ionic liquid Bismuth halide FTIR Raman

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Correction to: A Standards Organization for Open and FAIR Neuroscience: the International Neuroinformatics Coordinating Facility

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Neuroinformatics 2022年第1期20卷 37-38页

作者： Mathew Birdsall Abrams Jan G Bjaalie Samir Das Gary F Egan Satrajit S Ghosh Wojtek J Goscinski Jeffrey S Grethe Jeanette Hellgren Kotaleski Eric Tatt Wei Ho David N Kennedy Linda J Lanyon Trygve B Leergaard Helen S Mayberg Luciano Milanesi Roman Mouček J B Poline Prasun K Roy Stephen C Strother Tong Boon Tang Paul Tiesinga Thomas Wachtler Daniel K Wójcik Maryann E Martone INCF Secretariat Karolinska Institutet Stockholm Sweden. mathew@***. Institute of Basic Medical Sciences University of Oslo Oslo Norway. McGill Centre for Integrative Neuroscience McGill University Montreal QC Canada. Monash Biomedical Imaging Monash University Clayton VIC Australia. McGovern Institute for Brain Research Massachusetts Institute of Technology Cambridge MA USA. Department of Otolaryngology - Head and Neck Surgery Harvard Medical School Boston Boston MA USA. Monash eResearch Centre Monash University Melbourne VIC Australia. Department of Neuroscience School of Medicine University of California San Diego La Jolla CA USA. KTH Royal Institute of Technology School of Electrical Engineering and Computer Science Stockholm Sweden. Centre for Intelligent Signal and Imaging Research Institute of Health and Analytics Universiti Teknologi PETRONAS Perak Malaysia. Department of Psychiatry University of Massachusetts Medical School Worcester MA USA. Serendipitea.World Hasselby Sweden. Nash Family Center for Advanced Circuit Therapeutics Icahn School of Medicine New York NY USA. Institute of Biomedical Technologies National Research Council (CNR) Milan Italy. Department of Computer Science and Engineering Faculty of Applied Sciences University of West Bohemia Pilsen Czech Republic. Montreal Neurological Institute Faculty of Medicine and Health Sciences McGill University Montreal Canada. Computational Neuroscience & Neuroimaging Laboratory School of Bio-Medical Engineering Indian Institute of Technology (BHU) Varanasi UP India. Rotman Research Institute Baycrest Centre Department of Medical Biophysics University of Toronto Toronto ON Canada. Centre for Intelligent Signal and Imaging Research Institute of Health and Analytics Universiti Teknologi PETRONAS Bandar Seri Iskandar Malaysia. Donders Institute for Brain Cognition and Behaviour Radboud University Nijmegen Nijmegen Netherlands. Department of Biology II Ludwig-Maximilians-Univers

A Correction to this paper has been published: https://***/10.1007/s12021-021-09522-x

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Colossal enhancement of spin transmission through magnon confinement in an antiferromagnet

arXiv

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arXiv 2025年

作者： Husain, Sajid Ramesh, Maya Li, Xinyan Prokhorenko, Sergei Ojha, Shashank Kumar Ross, Aiden Das, Koushik Zhao, Boyang Park, Hyeon Woo Meisenheimer, Peter Nahas, Yousra Caretta, Lucas Martin, Lane W. Kim, Se Kwon Yao, Zhi Wen, Haidan Salahuddin, Sayeef Chen, Long-Qing Han, Yimo de Sousa, Rogério Bellaiche, Laurent Bibes, Manuel Schlom, Darrell G. Ramesh, Ramamoorthy Department of Materials Science and Engineering University of California BerkeleyCA94720 United States Rice University Materials Science and NanoEngineering HoustonTX United States Department of Materials Science and Engineering Cornell University IthacaNY14853 United States Rice Advanced Materials Institute Rice University HoustonTX77005 United States Smart Ferroic Materials Center Physics Department Institute for Nanoscience and Engineering University of Arkansas FayettevilleAR United States Department of Materials Science and Engineering Materials Research Institute Pennsylvania State University University ParkPA16802 United States Department of Electrical Engineering and Computer Sciences University of California BerkeleyCA94720 United States Department of Chemistry University of California BerkeleyCA94720 United States Materials Science Division Argonne National Laboratory LemontIL60439 United States Department of Physics Korea Advanced Institute of Science and Technology Daejeon Korea Republic of School of Engineering Brown University ProvidenceRI77005 United States Departments of Chemistry and Physics and Astronomy Rice University HoustonTX77005 United States Applied Mathematics and Computational Research Division Lawrence Berkeley National Laboratory CA94720 United States Advanced Photon Source Argonne National Laboratory LemontIL60439 United States Materials Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Rice Advanced Materials Institute Smalley-Curl Institute Ken Kennedy Institute Rice University HoustonTX77005 United States Department of Physics and Astronomy University of Victoria VictoriaBCV8W 2Y2 Canada Centre for Advanced Materials and Related Technology University of Victoria VictoriaBCV8W 2Y2 Canada Department of Materials Science and Engineering Tel Aviv University Ramat Aviv Tel Aviv6997801 Israel Laboratoire Albert Fert CNRS Thales Université Paris-Saclay Pa

Since Felix Bloch’s introduction of the concept of spin waves in 1930, magnons (the quanta of spin waves) have been extensively studied in a range of materials for spintronics, particularly for non-volatile logic-in-memory devices. Controlling magnons in conventional antiferromagnets and harnessing them in practical applications, however, remains a challenge. In this letter, we demonstrate highly efficient magnon transport in an LaFeO3/BiFeO3/LaFeO3 all-antiferromagnetic system which can be controlled electrically, making it highly desirable for energy-efficient computation. Leveraging spin-orbit-driven spin-charge transduction, we demonstrate that this material architecture permits magnon confinement in ultrathin antiferromagnets, enhancing the output voltage generated by magnon transport by several orders of magnitude, which provides a pathway to enable magnetoelectric memory and logic functionalities. Additionally, its non-volatility enables ultralow-power logic-in-memory processing, where magnonic devices can be efficiently reconfigured via electrically controlled magnon spin currents within magnetoelectric channels. © 2025, CC BY.

关键词： Antiferromagnetism

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Correction: CEPC Technical Design Report: Accelerator

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Radiation Detection technology and Methods 2024年第1期9卷 184-192页

作者： Abdallah, Waleed de Freitas, Tiago CarlosAdorno Afanaciev, Konstantin Ahmad, Shakeel Ahmed, Ijaz Ai, Xiaocong Aleem, Abid Altmannshofer, Wolfgang Alves, Fabio An, Weiming An, Rui Anderle, Daniele Paolo Antusch, Stefan Arai, Yasuo Arbuzov, Andrej Arhrib, Abdesslam Ashry, Mustafa Bai, Sha Bai, Yu Bai, Yang Bairathi, Vipul Balazs, Csaba Bambade, Philip Ban, Yong Bandyopadhyay, Triparno Bao, Shou-Shan Barber, Desmond P. Bat, Ays¸e Batozskaya, Varvara Behera, Subash Chandra Belyaev, Alexander Bertucci, Michele Bi, Xiao-Jun Bi, Yuanjie Bian, Tianjian Bianchi, Fabrizio Bieko¨tter, Thomas Biglietti, Michela Bilanishvili, Shalva Binglin, Deng Bodrov, Denis Bogomyagkov, Anton Bondarenko, Serge Boogert, Stewart Boonekamp, Maarten Borri, Marcello Bosotti, Angelo Boudry, Vincent Boukidi, Mohammed Boyko, Igor Bozovic, Ivanka Bozzi, Giuseppe Brient, Jean-Claude Budzinskaya, Anastasiia Bukhari, Masroor Bytev, Vladimir Cacciapaglia, Giacomo Cai, Hua Cai, Wenyong Cai, Wujun Cai, Yijian Cai, Yizhou Cai, Yuchen Cai, Haiying Cai, Huacheng Calibbi, Lorenzo Cang, Junsong Cao, Guofu Cao, Jianshe Chance, Antoine Chang, Xuejun Chang, Yue Chang, Zhe Chang, Xinyuan Chao, Wei Chatrabhuti, Auttakit Che, Yimin Che, Yuzhi Chen, Bin Chen, Danping Chen, Fuqing Chen, Fusan Chen, Gang Chen, Guoming Chen, Hua-Xing Chen, Huirun Chen, Jinhui Chen, Ji-Yuan Chen, Kai Chen, Mali Chen, Mingjun Chen, Mingshui Chen, Ning Chen, Shanhong Chen, Shanzhen Chen, Shao-Long Chen, Shaomin Chen, Shiqiang Chen, Tianlu Chen, Wei Chen, Xiang Chen, Xiaoyu Chen, Xin Chen, Xun Chen, Xurong Chen, Ye Chen, Ying Chen, Yukai Chen, Zelin Chen, Zilin Chen, Boping Chen, Chunhui Cheng, Hok Chuen Cheng, Huajie Cheng, Shan Cheng, Tongguang Chi, Yunlong Chimenti, Pietro Chiu, Wen Han Cho, Guk Chu, Ming-Chung Chu, Xiaotong Chu, Ziliang Coloretti, Guglielmo Crivellin, Andreas Cui, Hanhua Cui, Xiaohao Cui, Zhaoyuan D’Anzi, Brunella Dai, Ling-Yun Dai, Xinchen Dai, Xuwen De Maria, Antonio De Filippis, Nicola De La Taille, Christophe De Mori, Francesca De Sio, Chiara Del Core, Elisa Deng, Cairo University Giza Egypt Xi’an Jiaotong-Liverpool University Suzhou China Institute of Power Engineering of National Academy of Sciences of Belarus Minsk Belarus Pakistan Institute of Nuclear Science and Technology (PINSTECH) Islamabad Pakistan Applied Physics Department Science and Technology Federal Urdu University of Arts Islamabad Pakistan Zhengzhou University Zhengzhou China Institute of High Energy Physics Chinese Academy of Sciences Beijing China University of California Santa Cruz Santa Cruz USA Nanjing University Nanjing China Beijing Normal University Beijing China Harvard University Cambridge USA South China Normal University Guangzhou China University of Basel Basel Switzerland High Energy Accelerator Research Organization (KEK) Tsukuba Japan Joint Institute for Nuclear Research Dubna Russia Faculty of Sciences and Techniques Université Abdelmalek Essaadi Tangier Morocco Southeast University Nanjing China Department of Physics University of Wisconsin–Madison Madison USA Instituto de Alta Investigación Universidad de Tarapacá Arica Chile Monash University Melbourne Australia Laboratoire de Physique des 2 infinis Irène Joliot-Curie – IJCLab Orsay France Peking University Beijing China Department of Physics and Nanotechnology SRM Institute of Science and Technology Kattankulathur India Shandong University Jinan China University of New Mexico Albuquerque USA Bandirma Onyedi Eylul University Bandırma Turkey National Centre for Nuclear Research Warsaw Poland Indian Institute of Technology Madras (IN) Chennai India University of Southampton Southampton UK INFN Milano - LASA Segrate Italy Sun Yat-Sen University Guangzhou China China Institute of Atomic Energy Beijing China INFN-University of Torino Turin Italy Karlsruhe Institute of Technology Institute for Theoretical Physics Karlsruhe Germany INFN-Sezione di Roma Tre Rome Italy Kutaisi International University Kutaisi Georgia Soochow University Suzhou China Budker Institute

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Retraction notice to “Investigation the effects of an external driving force and cone shape of roughness on the phase change behavior of Argon fluid within a microchannel by molecular dynamic simulation” [J. Mol. Liq. 313 (2020) 113503]

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Journal of Molecular Liquids 2025年 430卷

作者： Aysan Shahsavar Goldanlou Majid Zarringhalam Nima Shirani As’ad Alizadeh Davood Toghraie Sara Rostami Institute of Research and Development Duy Tan University Da Nang 550000 Viet Nam Faculty of Electrical – Electronic Engineering Duy Tan University Da Nang 550000 Viet Nam Department of Mechanical Engineering South Tehran Branch Islamic Azad University Tehran Iran Department of Mechanical Engineering Khomeinishahr Branch Islamic Azad University Khomeinishahr Iran Department of Mechanical Engineering Urmia University of Technology Urmia Iran Department of Mechanical Engineering College of Engineering University of Zakho Zakho Iraq Laboratory of Magnetism and Magnetic Materials Advanced Institute of Materials Science Ton Duc Thang University Ho Chi Minh City Viet Nam Faculty of Applied Sciences Ton Duc Thang University Ho Chi Minh City Viet Nam

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Corrigendum to “Excitation-dependent emissive FeSe nanoparticles induced by chiral interlayer expansion and their multi-color bio-imaging” [Nano Today 43 (2022) 101424]

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Nano Today 2022年 45卷

作者： Junyoung Kwon Seung Won Jun Jeonghyo Kim Mirae Lee Youngeun Choi Doukyun Kim Minwoo Kim Sang Gil Lee Seungah Lee Seong Ho Kang Kwangseuk Kyhm Chang-Seok Kim Jeong Yoon Park Nicholas A. Kotov Chul-Hong Park Jaebeom Lee Department of Cogno-Mechatronics Engineering Pusan National University Busan 46240 Republic of Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea Ground Technology Research Institute Agency for Defense Development Daejeon 34186 Republic of Korea Department of Chemistry Chemical Engineering and Applied Chemistry Chungnam National University Daejeon 34134 Republic of Korea Department of Neurosurgery Spine and Spinal Cord Institute Gangnam Severance Spine Hospital Yonsei University College of Medicine Seoul Republic of Korea Quantum Matter Core-Facility and Research Center of Dielectric and Advanced Matter Physics Pusan National University Busan 46240 Republic of Korea Nano-Bio Electron Microscopy Research Group Korea Basic Science Institute Daejeon 34133 Republic of Korea Department of Applied Chemistry and Institute of Natural Sciences Kyung Hee University Yong-In 17104 Republic of Korea Department of Opto-mechatronics Engineering Pusan National University Busan 46240 Republic of Korea Department of Chemical Engineering and Department of Materials Science and Engineering University of Michigan Ann Arbor MI 48109 USA

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Thermally Radiative Casson Fluid Flow over a Cylinder with Newtonian Heating and Heat generation/absorption

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Journal of Physics: Conference Series 2021年第2期1964卷

作者： K Loganathan M Sivakumar M Mohanraj P Sakthivel Research and Development Wing Live4Research Tiruppur 638 106 Tamil Nadu India Department of Applied Mathematics and Computational Science PSG College of Technology Coimbatore 641 004 Tamil Nadu India Department of Mechanical Engineering Hindusthan College of Engineering and Technology Coimbatore Tamil Nadu 641 032 India Department of Physics Faculty of Engineering Karpagam Academy of Higher Education Coimbatore Tamil Nadu 641 021 India

This communication explains the impact of thermally radiative flow of a Casson fluid over a cylinder with velocity slip, suction/injection, and Newtonian heating condition. The governing PDE expressions are remodeled into an ODE expressing by applying suitable variables. The homotopy analysis (HAM) technique was implemented for solving our models. The impact of velocity field, temperature distribution, skin friction coefficient, Nusselt number in terms of diverse physical parameters like Casson parameter, suction/injection parameter, Newtonian heating parameter, radiation parameters, heat generation/absorption, Hartmann number and velocity slip parameter. The Hartmann number leads to slow down the fluid velocity, skin friction coefficient and local Nusselt number. The slip parameter decreases the fluid velocity and enhance the fluid heat transfer gradient.

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CuFe 2 O 4 embedded on polyaniline nanosheet a promising electrocatalyst for OER

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Journal of the Indian Chemical Society 2025年第7期102卷

作者： Nighat Kareem Iffat Karim Sarah A. Alsalhi Jayanti Makasana M.M. Rekha G. Senthil Kumar Mohammed A. Al-Anber Sankar Narayan Das Rahul Raj Chaudhary Abhinav Kumar Ankit D. Oza Advanced Materials and Electrochemical Research Lab Taunsa Sharif 32100 Pakistan Department of Chemistry University of Education DG Khan Campus Lahore Pakistan Department of Physics College of Science Princess Nourah bint Abdulrahman University P.O. Box 84428 Riyadh 11671 Saudi Arabia Marwadi University Research Center Department of Mechanical Engineering Faculty of Engineering & Technology Marwadi University Rajkot 360003 Gujarat India Department of Chemistry and Biochemistry School of Sciences JAIN (Deemed to be University) Bangalore Karnataka India Department of Mechanical Engineering Sathyabama Institute of Science and Technology Chennai Tamil Nadu India Department of Chemistry Faculty of Sciences Applied Science Private University P.O. Box 166 Amman 11931 Jordan Department of Mechanical Engineering Siksha 'O' Anusandhan (Deemed to be University) Bhubaneswar Odisha 751030 India Department of Mechanical Engineering Chandigarh Engineering College Chandigarh Group of Colleges-Jhanjeri Mohali 140307 Punjab India Department of Nuclear and Renewable Energy Ural Federal University Named after the First President of Russia Boris Yeltsin Ekaterinburg 620002 Russia Department of Mechanical Engineering and Renewable Energy Technical Engineering College The Islamic University Najaf Iraq Centre for Research Impact & Outcome Chitkara University Institute of Engineering and Technology Chitkara University Rajpura 140401 Punjab India University Centre for Research and Development Chandigarh University Mohali Punjab 140413 India

In water-splitting oxygen evolution is a crucial and best method to provide clean hydrogen fuel for this purpose many electrocatalysts have been employed. However, creating electrocatalysts for water splitting with a low overpotential is a big challenge. The present work reported the formation of a polyaniline-based CuFe 2 O 4 composite for water-splitting via a hydrothermal route. The structure, shape and texture properties of manufactured electrocatalysts have been determined using different strategies like X-ray diffraction, Scanning electron microscope and Brunauer-Emmett-Teller. Additionally, Electrochemical impedance spectroscopy, linear sweep voltammetry and Chronoamperometry were used to estimate the kinetics of reaction and durability of the electrocatalyst. The electrochemical results demonstrated that the produced material has over-potential 218 mV at current density 10 mA/cm 2 with a Tafel slope of 37 mV dec −1 . While 30 h durability test confirmed that fabricated composite has greater potential with slight variation in current. The exceptional electrochemical properties of the CuFe 2 O 4 /PANI composite make it a promising catalyst for OER and other energy conversion applications.

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The pigment transporter Redboy confers programmed body colour transition in orchid mantises

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Nature ecology & evolution 2025年 2025 May 30页

作者： Xiao-Jin Pei Dong Zhao Jie Luo Pei-Yao Jia Yuan Luo Dong-Wei Yuan Wen-Xin Hou Zhan-Feng Zhang Dan-Yan Huang Jia-Xin Ni Hui-Ze Gao Zhanqi Chen Yun-Xia Luan Xue-Xin Chen Wei Zhang Sheng Li Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology Guangzhou Key Laboratory of Insect Development Regulation and Application Research Institute of Insect Science and Technology School of Life Sciences South China Normal University Guangzhou China. Guangmeiyuan R&D Center Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology South China Normal University Meizhou China. Guangdong Laboratory for Lingnan Modern Agriculture Guangzhou China. State Key Laboratory of Gene Function and Modulation Research School of Life Sciences Peking University Beijing China. Peking-Tsinghua Center for Life Sciences Academy for Advanced Interdisciplinary Studies Peking University Beijing China. State Key Laboratory of Crop Stress Biology for Arid Areas and Key Laboratory of Integrated Pest Management on Crops in Northwestern Loess Plateau Ministry of Agriculture and Rural Affairs Northwest A&F University Yangling People's Republic of China. Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical Garden Chinese Academy of Sciences Yunnan China. Guangdong Laboratory for Lingnan Modern Agriculture Guangzhou China. xxchen@***. Ministry of Agriculture and Rural Affairs Key Lab of Molecular Biology of Crop Pathogens and Insect Pests Key Laboratory of Biology of Crop Pathogens and Insects of Zhejiang Province Institute of insect Sciences Zhejiang University Hangzhou China. xxchen@***. State Key Laboratory of Gene Function and Modulation Research School of Life Sciences Peking University Beijing China. weizhangvv@***. Peking-Tsinghua Center for Life Sciences Academy for Advanced Interdisciplinary Studies Peking University Beijing China. weizhangvv@***. Institute of Ecology Peking University Beijing China. weizhangvv@***. Institute for Tibetan Plateau Research Peking University Beijing China. weizhangvv@***. Medog Biodiversity Observation and Research Station of Xizang Autonomous Region Nyingchi China

Programmed phenotypic transition is prevalent throughout the tree of life, yet the concrete mechanisms that underpin this phenomenon are poorly understood. The orchid mantis (Hymenopus coronatus, Mantodea) is a model study system for programmed body colour transitions that displays a prominent black-red body colour in first-instar nymphs, then switches to a flowery white body colour in later-instar nymphs. Here we reveal that this body colour transition is achieved by the simultaneous excretion of decarboxylated-xanthommatin (red pigment) and the accumulation of uric acid (white pigment) in the epidermis during the first moult. This change in pigmentation is associated with a novel subtype of ABCG pigment transporter that we call 'Redboy' in Polyneoptera, which is upregulated by insect steroid hormone (ecdysone) during the first moult of orchid mantises. RNAi assay and pigment analyses show that Redboy functions together with the co-transporter White, exporting red pigments from and concurrently importing white pigments into the epidermal cells. Spectral reflectance analyses and predation experiments reveal that Redboy-conferred programmed body colour transition enhances predator avoidance during the first instar, and both prey attraction and predator avoidance in later instars. Our findings clarify how gene family evolution and hormone regulation coordinate programmed phenotypic transition and promote ecological adaptation in orchid mantises.

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Two-dimensional ferromagnetic-ferroelectric multiferroics in violation of the d0 rule

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Physical Review B 2019年第19期99卷 195434-195434页

作者： Hengxin Tan Menglei Li Haitao Liu Zhirong Liu Yuanchang Li Wenhui Duan State Key Laboratory of Low-Dimensional Quantum Physics and Collaborative Innovation Center of Quantum Matter Department of Physics Tsinghua University Beijing 100084 China Department of Physics Capital Normal University Beijing 100048 China Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics PO Box 8009 Beijing 100088 China Center for Nanochemistry College of Chemistry and Molecular Engineering Peking University Beijing 100871 China Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Beijing 100081 China Institute for Advanced Study Tsinghua University Beijing 100084 China

Contribution of a d electron to ferroelectricity of type-II multiferroics causes strong magnetoelectric coupling and distinguishes them from the conventional type-I multiferroics. However, their therein polarization is too small because the ferroelectricity is merely a derivative from the magnetic order. Here we report a class of multiferroic materials, monolayer VOX2 (X=Cl, Br, and I), which combine the advantages of type-I and type-II multiferroics. Both ferroelectricity and magnetism arise from the same V cation, where the filled d orbital is perpendicular to an a priori ferroelectric polarization and thus poses no hindrance to ferroelectricity, indicating a violation of the usual d0 rule. This makes the combination of large polarizations and strong magnetoelectric coupling possible. Our findings not only add new ferromagnetic-ferroelectric multiferroics, but also point to a unique mechanism to engineer multiferroics.

关键词： Ferroelectricity 2-dimensional systems Multiferroics First-principles calculations

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