Article
Chemistry, Physical
Bowen Yang, Yin Min Goh, Suk Hyun Sung, Gaihua Ye, Sananda Biswas, David A. S. Kaib, Ramesh Dhakal, Shaohua Yan, Chenghe Li, Shengwei Jiang, Fangchu Chen, Hechang Lei, Rui He, Roser Valenti, Stephen M. Winter, Robert Hovden, Adam W. Tsen
Summary: The authors investigate the magnetic anisotropy in monolayer RuCl3 and observe a transition from easy-plane to easy-axis due to in-plane distortions of Cl atoms. This finding is important for realizing a quantum spin liquid. The study provides insights into the possibility of exploring Kitaev physics in a true two-dimensional limit.
Article
Chemistry, Multidisciplinary
Jine Zhang, Xiaobing Chen, Mengqin Wang, Qinghua Zhang, Wenxiao Shi, Xiaozhi Zhan, Meng Zhao, Zhe Li, Jie Zheng, Hui Zhang, Furong Han, Huaiwen Yang, Tao Zhu, Banggui Liu, Fengxia Hu, Baogen Shen, Yuansha Chen, Yue Zhang, Yunzhong Chen, Weisheng Zhao, Jirong Sun
Summary: Materials with strong spin-orbit coupling and ferromagnetism are attracting attention for their exotic properties and potential applications in spintronics. In this study, a transition from paramagnetism to ferromagnetism was observed in CaRuO3 superlattices. Anomalous Hall effect was observed up to 180 K, with significantly larger Hall conductivity and angle compared to typical 3d ferromagnetic oxides. Density functional theory calculations and polarized neutron reflectometry confirmed the ferromagnetic state of CaRuO3 layers and their potential applications in multistate data storage.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Hongyu Chen, Peizhe Tang, Jia Li
Summary: Using density functional theory, monolayer vanadium oxyhydroxide (VOOH) and chromium oxyhydroxide (CrOOH) are predicted as 2D ferromagnetic semiconductors with excellent stability. They exhibit differences in ferromagnetic ordering, critical temperature, and magnetic anisotropy due to the varying occupancy of d electrons between V3+ and Cr3+ ions, making them suitable candidates for investigating 2D ferromagnets.
Article
Materials Science, Multidisciplinary
Jingjuan Su, Yihang Bai, Puyuan Shi, Yufei Tu, Bing Wang
Summary: Recent experiments have shown that two-dimensional (2D) magnetism has attracted strong interest in advanced spintronics applications. However, the limited Curie temperature and magnetic anisotropy energy (MAE) hinder their potential applications. Through density functional theory calculations, we have predicted a stable 2D monolayer of Na3VAs2, which exhibits intrinsic ferromagnetic (FM) order and a high MAE (570 μeV per V atom). Monte Carlo simulation reveals that this monolayer has a Curie temperature (TC) of up to 305 K based on anisotropic Heisenberg mode. In addition, the 2D Na3VAs2 monolayer exhibits ideal half-metallic properties, which are maintained under various strains, and possesses good dynamic, thermal, and mechanical stability. The exceptional properties of the Na3VAs2 monolayer make it a promising candidate for spintronic devices.
RESULTS IN PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Ying Zhao, Qinxi Liu, Jianpei Xing, Xue Jiang, Jijun Zhao
Summary: The concept of planar hypercoordinate atoms, initially proposed in molecular systems, has now been expanded to 2D periodic systems. Through first-principles calculations, a stable FeSi2 monolayer with planar hexacoordinate Fe atoms has been predicted. This monolayer exhibits excellent thermal and kinetic stability, anisotropic mechanical properties, and room-temperature ferromagnetism.
NANOSCALE ADVANCES
(2022)
Article
Materials Science, Multidisciplinary
Xiaotian Fang, Baozeng Zhou, Xiaocha Wang, Wenbo Mi
Summary: In this study, the electronic structure and magnetic properties of a two-dimensional (2D) OsI3 monolayer were investigated using first-principles calculations. The results show that the monolayer exhibits various orbital orderings and magnetic states, and can be modulated by strain to control magnetic anisotropy and Curie temperature, indicating its potential application in spintronics.
MATERIALS TODAY PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Shaowen Xu, Fanhao Jia, Guodong Zhao, Wei Wu, Wei Ren
Summary: A highly stable 2D multiferroic VOF monolayer with significant ferromagnetism and ferroelectricity has been proposed, showing promising prospects for future multifunctional nanoelectronic device applications.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Hui Zhang, Madisen Holbrook, Fei Cheng, Hyoungdo Nam, Mengke Liu, Chi-Ruei Pan, Damien West, Shengbai Zhang, Mei-Yin Chou, Chih-Kang Shih
Summary: The synthesis of a single atomic sheet of honeycomb structure BeO (h-BeO) grown on Ag(111) thin films on Si(111) wafers using molecular beam epitaxy (MBE) is reported. The h-BeO has a lattice constant of 2.65 A and an insulating band gap of 6 eV. Weak interaction between h-BeO layer and Ag(111) substrate is found, making h-BeO an attractive candidate for future technological applications.
Article
Chemistry, Physical
Miaojia Yuan, Ruishan Tan, Mengmeng Li, Cui Jin, Tao Jing, Qilong Sun
Summary: By using first-principles calculations, the influence of W atom adsorption and biaxial strain on the magnetic properties of 2D material Fe3GeTe2 is investigated. It is found that the adsorption mode and strain play a critical role in determining the magnetocrystalline anisotropy (MCA) of Fe3GeTe2. Adsorption of W atoms leads to a change in spin reorientation and a colossal MCA. The strain-driven modulation of MCA in different adsorption configurations is also revealed.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Wanxue Li, Chunsheng Guo, Qing Zang, Rui Ding, Yong Zhao
Summary: The two-dimensional MoTeI monolayer is found to be intrinsically a ferromagnetic semiconductor through density functional theory, with the magnetic states sensitive to biaxial strain. The material is fully spin polarized and half-metallic in its intrinsic state or under tensile strain, but transitions to an antiferromagnetic state under compressive strain over 0.4%. Despite the magnetic phase transition, the semiconducting characteristics are maintained with little charge transfer observed, suggesting potential applications in spintronics.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Huiping Li, Wenguang Zhu
Summary: This work demonstrates a new type of magnetic heterostructure that achieves control of ferroelectricity through spin manipulation. By vertically stacking two ferromagnetic layers and one antiferromagnetic layer, the entire structure's electric polarization can be reversibly controlled by an external magnetic field. The effectiveness of this design strategy is further validated in several other lattice-matched heterostructures.
Article
Engineering, Electrical & Electronic
Shuoke Xu, Xikui Ma, Yangyang Li, Yuanyuan Qu, Mingwen Zhao
Summary: Two-dimensional multiferroic materials provide a unique platform for the development of next-generation multifunctional devices. A stable 2D configuration of a lead oxide monolayer is proposed to achieve the coupling between ferroelectricity and ferroelasticity. This material can be used to regulate mechanical and electronic properties and design nanoscale devices.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Multidisciplinary Sciences
Guopeng Wang, Tao Hu, Yimin Xiong, Xue Liu, Shengchun Shen, Jianlin Wang, Mengqian Che, Zhangzhang Cui, Yingying Zhang, Luyi Yang, Zhengcao Li, Yalin Lu, Mingliang Tian
Summary: This study reports a method to achieve 2D oxide magnetism through electric-field controlled proton evolution. By using ionic liquid gating to modulate the proton concentration in (SrRuO3)1/(SrTiO3)N (N = 1, 3) superlattice, an electric-field induced metal-insulator transition was observed, along with suppressed magnetic ordering and modulated magnetic anisotropy. Theoretical analysis reveals that proton intercalation plays a crucial role in both electronic and magnetic phase transitions. This work stimulates the tuning functionality of 2D oxide monolayer magnetism by voltage control, providing potential for future energy-efficient electronics.
Article
Chemistry, Physical
Wenhui Wan, Botao Fu, Chang Liu, Yanfeng Ge, Yong Liu
Summary: In this study, we used first-principles calculations to predict that Janus monolayer V2XN (X = P, As) is a 2D-XY ferromagnet with easy magnetization planes, making it suitable for 2D spintronic devices. Monte Carlo simulations revealed that monolayer V2AsN has a magnetic anisotropy energy of 292.0 μeV per V atom and a transition temperature (T-BKT) of 434 K, higher than that of monolayer V2PN. Additionally, a tensile strain of 5% can further enhance the T-BKT of monolayer V2XN to above 500 K.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
San-Dong Guo, Jing-Xin Zhu, Meng-Yuan Yin, Bang-Gui Liu
Summary: Electronic correlation and magnetic anisotropy play a crucial role in determining the electronic properties of materials. The study shows that increasing electron correlation effects can induce phase transitions, and magnetic anisotropy is strongly dependent on the U value. Different orbital distributions and magnetocrystalline directions also affect the material properties.
Article
Chemistry, Physical
Sehwan Song, Jiwoong Kim, Jisung Lee, Hyegyeong Kim, Noboru Miyata, Neeraj Kumar, Y. Soh, Jae Hyuck Jang, Chanyong Hwang, Brian J. Kirby, Sungkyun Park
Summary: FeRh thin films exhibit unexpected ferromagnetic characteristics at low temperatures, which is different from their bulk state. The coexistence of antiferromagnetic and residual ferromagnetic states leads to thermomagnetic irreversibility and negative magnetoresistance. Polarized neutron reflectometry reveals the presence of non-uniform ferromagnetic states at the interfaces, with the bottom region correlated to structural distortion and the top region originating from non-stoichiometry.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Xiaohan Wu, Da Lan, Chengjun Sun, Hua Zhou, Xiaojiang Yu, Ping Yang, Xiaoqian Yu, Chao Liu, Pingfan Chen, Jun Ding, Jingsheng Chen, Gan Moog Chow
Summary: This study reports a two-step magnetization reversal in PZT/LSMO superlattices, which is attributed to the combined effects of strain, ferroelectric polarization, and exchange. The results demonstrate enhanced magnetoelectric coupling in PZT/LSMO superlattices, which holds significant implications for the application of multiferroic-based devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Review
Chemistry, Physical
Sergey V. Ushakov, Qi-Jun Hong, Dustin A. Gilbert, Alexandra Navrotsky, Axel van de Walle
Summary: This paper discusses the solid-state chemistry of thorium and rare earths, focusing on the monoxides and related rocksalt phases. Experimental and computational studies have shown the potential applications of lanthanide monoxides in spintronics and the stability of thorium monoxide under high pressure. New computational results further confirm the stability of thorium monoxide at high pressure and suggest the possibility of synthesizing (Th,Nd)O under specific conditions.
Article
Chemistry, Physical
Mingyu Hu, Yalan Zhang, Jue Gong, Hua Zhou, Xianzhen Huang, Mingzhen Liu, Yuanyuan Zhou, Shihe Yang
Summary: By employing a sequential surface treatment method, we have significantly improved the optoelectronic properties and stability of cesium tin-lead perovskites. This has resulted in a power conversion efficiency of 16.79% and a T90 stability of 958 h, surpassing previous reported performance parameters for inorganic Sn-Pb PSCs and reducing the performance gap between all-inorganic and hybrid organic-inorganic Sn-Pb PSCs with sub-1.4 eV bandgaps.
ACS ENERGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Peng Chen, Qi Yao, Junqi Xu, Qiang Sun, Alexander J. Grutter, Patrick Quarterman, Purnima P. Balakrishnan, Christy J. Kinane, Andrew J. Caruana, Sean Langridge, Ang Li, Barat Achinuq, Emily Heppell, Yuchen Ji, Shanshan Liu, Baoshan Cui, Jiuming Liu, Puyang Huang, Zhongkai Liu, Guoqiang Yu, Faxian Xiu, Thorsten Hesjedal, Jin Zou, Xiaodong Han, Haijun Zhang, Yumeng Yang, Xufeng Kou
Summary: Intercalating ferromagnetic MnTe layers into the framework of MnBi2Te4 can create ferromagnet-intercalated MnBi2Te4 superlattices with tunable magnetic exchange interactions. By using molecular beam epitaxy, we have created [(MBT)(MnTe)(m)](N) superlattices and investigated their magnetic interaction properties using polarized neutron reflectometry and magnetoresistance measurements. The incorporation of ferromagnetic spacers adjusts the antiferromagnetic interlayer coupling of the MnBi2Te4 layers through the exchange-spring effect at MnBi2Te4/MnTe hetero-interfaces. The thickness of MnTe can be used to modulate the relative strengths of the ferromagnetic and antiferromagnetic order, and the superlattice periodicity can tailor the spin configurations of the synthesized multilayers.
NATURE ELECTRONICS
(2023)
Article
Chemistry, Physical
D. C. Mahendra, Ding-Fu Shao, Vincent D. -H. Hou, Arturas Vailionis, P. Quarterman, Ali Habiboglu, M. B. Venuti, Fen Xue, Yen-Lin Huang, Chien-Min Lee, Masashi Miura, Brian Kirby, Chong Bi, Xiang Li, Yong Deng, Shy-Jay Lin, Wilman Tsai, Serena Eley, Wei-Gang Wang, Julie A. Borchers, Evgeny Y. Tsymbal, Shan X. Wang
Summary: By utilizing unconventional spins generated in a MnPd3 thin film grown on an oxidized silicon substrate, the authors observed both conventional spin-orbit torques and unconventional out-of-plane and in-plane anti-damping-like torques in MnPd3/CoFeB heterostructures, enabling complete field-free switching of perpendicular cobalt. These unconventional torques are attributed to the low symmetry of the (114)-oriented MnPd3 films. The results provide a path towards practical spin channels in ultrafast magnetic memory and logic devices.
Article
Nanoscience & Nanotechnology
Sreejith Nair, Zhifei Yang, Dooyong Lee, Silu Guo, Jerzy T. Sadowski, Spencer Johnson, Abdul Saboor, Yan Li, Hua Zhou, Ryan B. Comes, Wencan Jin, K. Andre Mkhoyan, Anderson Janotti, Bharat Jalan
Summary: A study shows that epitaxial strain can be used to enhance the metal oxidation chemistry and thin-film growth of metal oxide thin films. Platinum group metal oxides are promising materials for future electronics and spintronics. However, their synthesis as thin films is challenging due to low vapor pressures and oxidation potentials. Using Ir as an example, the researchers demonstrate how epitaxial strain can control its oxidation chemistry, enabling phase-pure Ir or IrO2 films. The study also reveals the generality of this principle by showing the effect of epitaxial strain on Ru oxidation.
NATURE NANOTECHNOLOGY
(2023)
Article
Chemistry, Physical
Xinbo Li, Xiyang Wang, Junfang Ding, Mingwei Ma, Shuhua Yuan, Qilei Yang, Zhen Wang, Yue Peng, Chengjun Sun, Hua Zhou, Haozhe Liu, Yimin A. Wu, Keke Huang, Liping Li, Guangshe Li, Shouhua Feng
Summary: This study focuses on unraveling the important role of surface oxygen sites in catalytic reactions of transition metal oxides. By modifying the surface structure of cubic perovskite cobalt oxide, the research demonstrates how active oxygen sites enhance the kinetics of the CO oxidation reaction through a Mars-van Krevelen mechanism. This understanding provides valuable insight into the relationship between active oxygen sites, surface electronic structure, and the reaction mechanism of transition metal oxides.
Editorial Material
Nanoscience & Nanotechnology
An-Chou Yeh, Stephane Gorsse, Veerle Keppens, Dustin A. Gilbert
Article
Physics, Applied
Ranjan Kumar Patel, Ramesh Naidu Jenjeti, Rajat Kumar, Nandana Bhattacharya, Siddharth Kumar, Shashank Kumar Ojha, Zhan Zhang, Hua Zhou, Ke Qu, Zhen Wang, Zhenzhong Yang, Christoph Klewe, Padraic Shafer, S. Sampath, Srimanta Middey
Summary: This study investigates the OER activity of (La0.2Pr0.2Nd0.2Sm0.2Eu0.2)NiO3 single-crystalline thin films grown on NdGaO3 substrates as a function of film thickness in 0.1 M KOH electrolyte. The OER activity increases with the thickness of the film due to enhanced Ni d-O p covalency and reduced charge transfer energy. However, excessive leaching occurs in thicker films, and a film thickness of 75 unit cells is found to have optimal OER activity.
APPLIED PHYSICS REVIEWS
(2023)
Article
Philosophy
Jinghua Guo
Summary: The International Council on Monuments and Sites (ICOMOS) believes that heritage, both natural and cultural, plays a fundamental role in achieving the United Nations Sustainable Development Goals (SDGs). This paper examines the Liangzhu cultural heritage in Hangzhou, China, arguing that cultural heritage is a unique form of living narrative. It emphasizes the importance of cultural heritage narratives in global sustainable development, highlighting examples such as the cross-media development of the Liangzhu site and the integration of 5G technology in Hangzhou as a model for sustainable urban development.
CULTURA-INTERNATIONAL JOURNAL OF PHILOSOPHY OF CULTURE AND AXIOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Mo Zhu, Zhangzhang Cui, Yingying Zhang, Zheling Shan, Weiwei Li, Qingyou Lu, Zhengcao Li, Yalin Lu
Summary: Control of dimensionality is a powerful tool to induce different electronic and magnetic phases. In this study, we experimentally demonstrate a transition from ferromagnetic metal to antiferromagnetic insulator in SrRuO3 epitaxial films as the thickness decreases, with the spin easy axis changing to the in-plane direction. First-principles calculations reveal that the combined effects of orbital-selective quantum confinement and oxygen octahedral rotation drive this transition by reorienting the Ru spins. Our findings provide important insights into the role of dimensionality in complex oxide heterostructures and suggest that it could be the driving force behind the dead-layer phenomenon in two-dimensional systems.
Article
Materials Science, Multidisciplinary
Jingyuan Wang, Camron Farhang, Di Yue, Xiaofeng Jin, Xiangde Zhu, Jing Xia
Summary: Recent experiments have shown chiral p-wave-like superconductivity in epitaxial Bi/Ni bilayers, while in nonepitaxial Bi/Ni bilayers, superconductivity arises from the formation of NiBi3, which hosts both ferromagnetic and superconducting orders at the surface. However, high-resolution surface magneto-optic Kerr effect measurements on single-crystal NiBi3 indicate the absence of time-reversal symmetry breaking, suggesting that the superconductivity in nonepitaxial Bi/Ni is distinctively different from that in epitaxial Bi/Ni.
