Review
Materials Science, Multidisciplinary
Wen-Sen Wei, Zhi-Dong He, Zhe Qu, Hai-Feng Du
Summary: A magnetic skyrmion, a particle-like spin swirling object, has a nontrivial topology and is seen as a promising next-generation information carrier in high-performance spintronic devices. This study delves into the magnetic properties of skyrmion-hosting materials stemming from DMI, highlighting the relationship between materials' point groups and DMI, as well as the common features of magnetic skyrmions experimentally verified in magnetization and magnetotransport measurements. Discussions also include other particle-like magnetic configurations in chiral magnets and their crossover with superconductors.
Article
Chemistry, Multidisciplinary
Ali Hallal, Jinghua Liang, Fatima Ibrahim, Hongxin Yang, Albert Fert, Mairbek Chshiev
Summary: By comparing the behavior of Dzyaloshinskii-Moriya interaction (DMI) and perpendicular magnetic anisotropy (PMA) at graphene/Co and h-BN/Co interfaces, it is found that the latter shows slightly larger DMI and similar PMA, which leads to the formation of skyrmions under thicker Co layers.
Article
Chemistry, Multidisciplinary
Mateusz Zelent, Iuliia V. Vetrova, Jan Soltys, Xiaoguang Li, Yan Zhou, Vladislav A. Gubanov, Alexandr Sadovnikov, Tomas Scepka, Jan Derer, Roman Stoklas, Vladimir Cambel, Michal Mruczkiewicz
Summary: Numerically demonstrated skyrmion formation in ultrathin nanodisks using magnetic force microscopy tip. Experimental and micromagnetic simulation confirmed the influence of local magnetic field on magnetization states, with the formation of horseshoe magnetic domain being a key transition to skyrmion state. The reliable and repetitive procedure of skyrmion formation by magnetic probe provides a simple solution for nanodisks.
Article
Materials Science, Multidisciplinary
S. Al Naabi, R. Sbiaa
Summary: In this study, a modified Landau-Lifshitz-Gilbert formalism is used to investigate the correlation between physical properties and skyrmion performances. The study establishes a phase diagram that combines multiple parameters and defines the optimal conditions for achieving small-sized skyrmions that can be displaced with high velocity.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Sahbi El Hog, Ildus F. Sharafullin, H. T. Diep, H. Garbouj, M. Debbichi, M. Said
Summary: In this article, we study a triangular lattice with Heisenberg spins interacting via an antiferromagnetic exchange interaction and a Dzyaloshinskii-Moriya interaction. We investigate the ground state and spin-wave spectrum for two cases: perpendicular D and in-plane D. The results show that for perpendicular D, the ground state is periodic and spin waves are forbidden for small wave vectors. In the case of in-plane D, a stable skyrmion crystal composed of three interpenetrating skyrmion sublattices is observed.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Ying-Ying Dai, Han Wang, Teng Yang, Adekunle O. Adeyeye, Zhi-Dong Zhang
Summary: In this study, the coexistence of circular and elongated skyrmions in helimagnetic films under zero field is observed. It is found that the elongated skyrmions are determined by the intrinsic DMI and carry the same topological charge as the circular ones.
Article
Materials Science, Multidisciplinary
Chen Cheng, Zhengren Yan, Jing Dong, Yizhou Liu, Zhengcai Xia, Liang Li, Xiufeng Han
Summary: Introducing the shape anisotropy of a skyrmion is an alternative strategy for controlling the skyrmion Hall effect. An elliptical skyrmion shows anisotropic motion under the applied driving force. The study of an elliptical skyrmion induced by uniaxial in-plane magnetic anisotropy reveals that the skyrmion Hall angle can reach 90° with optimized parameters.
Article
Chemistry, Analytical
M. Cubukcu, S. Poellath, S. Tacchi, A. Stacey, E. Darwin, C. W. F. Freeman, C. Barton, B. J. Hickey, C. H. Marrows, G. Carlotti, C. H. Back, O. Kazakova
Summary: This study shows that magnetic skyrmions can be stabilized at room temperature in continuous [Ir/Co/Pt](5) multilayers on SiO2/Si substrates without the prior application of electric current or magnetic field. The transition of magnetic domain patterns from worm-like state to separated stripes is observed by decreasing the Co thickness. The density of skyrmions can be significantly enhanced after applying the in-plane field procedure, providing means to manipulate their density and optimize skyrmion-based devices.
Article
Physics, Multidisciplinary
Bingjie Liu, Can Huang, Lingzi Jiang, Ke-Er Liu, Yanfei Pan, Chunlan Ma, Jiyu Fan, Yan Zhu
Summary: Based on density functional theory calculations, the electronic structure and magnetism of monolayer 2H-FeTe2 were studied. The dispersion relation E(q) and E(-q) between energy and wave vector q of in-plane spin spiral at opposite directions was obtained. The Heisenberg interaction (HBI) and Dzyaloshinsky-Moriya interaction (DMI) parameters (Ji and di) were extracted from the energy values using HBI with DMI model. It was found that collinear ferromagnetic and antiferromagnetic states coexist in monolayer 2H-FeTe2, and the positive value of J3 plays a key role in the generation of ferromagnetism. The presence of intrinsic in-plane DMI is due to the broken inversion symmetry within the monolayer. This work contributes to the understanding of chiral spin textures in 2D magnets and the design of orbital spintronic electronic devices.
Article
Physics, Applied
Robin Msiska, Davi R. Rodrigues, Jonathan Leliaert, Karin Everschor-Sitte
Summary: Contrary to previous belief, this study shows that the skyrmion Hall effect does not vanish for spin-orbit-torque-driven objects. The skyrmion Hall angle is directly related to the helicity of the skyrmions and poses an unexpected challenge for developing faster and lower input racetrack memories based on spin-orbit torques.
PHYSICAL REVIEW APPLIED
(2022)
Article
Materials Science, Multidisciplinary
Dan Liu, Tongyun Zhao, Baogen Shen, Fei Peng, Ming Zhang, Fengxia Hu, Jirong Sun
Summary: Topological spin textures like magnetic skyrmions have shown potential in data storage applications due to their stability. Surprisingly, simulation results suggest that skyrmion equilibrium states can exist in certain materials without external assistance. The formation of these textures is influenced by factors like magnetocrystalline anisotropy, exchange interaction, and saturation magnetization, showcasing the potential for controlling magnetic nanostructures.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Optics
D. A. M. Abo-Kahla, M. Y. Abd-Rabbou, N. Metwally
Summary: The study examines the orthogonality time for different types of spin interactions with increasing number of environment qubits. It shows that the XX chain model has the shortest orthogonality time, while the Ising model has the longest time. The external field increases orthogonality numbers, while Dzyaloshinsky-Moriya interaction decreases orthogonality time. Initial state settings and external fields significantly affect the decrease/increase of orthogonality time.
LASER PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Sebastian Castillo-Sepulveda, Javier A. Velez, Rosa M. Corona, Vagson L. Carvalho-Santos, David Laroze, Dora Altbir
Summary: By using numerical simulations, the dynamics of two skyrmions nucleated in a double-disk structure were studied. Different regimes for the dynamical behavior of the skyrmions were observed depending on the geometry and electric current, including stagnation points, oscillatory motion, and two types of skyrmion annihilation. A state diagram was presented to provide a comprehensive understanding of the associate phenomena.
Article
Materials Science, Multidisciplinary
Y. Q. Guo, P. Li, Q. R. Cui, Y. L. Ga, L. M. Wang, H. X. Yang, J. J. Zhou, T. Zhu, C. Q. Hu, Y. Gao, C. L. He, S. P. Shen, S. G. Wang
Summary: A systematic study on the magnetic properties of IrMn(PtMn) and MgO/IrMn(MgO/PtMn) stacks, including DMI, Heisenberg exchange coupling, and magnetocrystalline anisotropy, was carried out using first-principles calculation. The effect of DMI on topological magnetism in these structures was investigated through micromagnetic simulations based on magnetic parameters from first-principles calculation. The origins of interfacial DMI in MgO/IrMn were revealed to be the dominant contribution from the Ir layer and the orbital hybridization with Ir 3d orbit. Our findings suggest a new route to generate magnetic antiferromagnetic skyrmions at oxide/antiferromagnetic interfaces, which could serve as ideal information carriers.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Mathematics, Applied
Panchi Li, Shuting Gu, Jin Lan, Jingrun Chen, Weiqing Ren, Rui Du
Summary: Magnetic skyrmions, which are widely present in various magnetic systems, have been studied using a proposed numerical method in this study. The method allows simulations of magnetization dynamics in chiral magnets with Dzyaloshinkii-Moriya interaction, revealing interesting dynamic instabilities and transition paths.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2023)
Article
Materials Science, Multidisciplinary
Zhiyong Liu, Wenyuan Shi, Teng Yang, Zhidong Zhang
Summary: Based on the effective continuum model, this study investigates the emergence of magic angles and flat band topology in alternating-twist multilayer graphene systems. It is found that all of the systems have flat bands at the magic angles, which provide a new avenue for understanding superconductivity and realizing anomalous Hall effect.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Lijing Zhu, Teng Yang, Yunlei Zhong, Zhitong Jin, Xingxing Zhang, Cheng Hu, Ziqiang Wang, Zhenghan Wu, Zhidong Zhang, Zhiwen Shi, Jing Kong, Xu Zhang, Lin Zhou
Summary: This study presents a general damage-free transfer method for sensitive 2D materials, along with a TEM sample preparation technique for recycling materials on TEM grids with high fidelity.
Article
Chemistry, Physical
Jiuxiang Dai, Teng Yang, Zhitong Jin, Yunlei Zhong, Xianyu Hu, Jingyi Zou, Weigao Xu, Tao Li, Yuxuan Lin, Xu Zhang, Lin Zhou
Summary: This article reports the van der Waals epitaxy of two-dimensional indium arsenide (InAs) single crystals and investigates their thickness-dependent optical properties. The as-grown InAs flakes exhibit high crystalline quality and homogeneity, and possess high conductivity and carrier mobility in the 2D materials family, which opens up new possibilities for high-performance electronics and optoelectronics applications.
Article
Multidisciplinary Sciences
Tianye Huang, Xuecou Tu, Changqing Shen, Binjie Zheng, Junzhuan Wang, Hao Wang, Kaveh Khaliji, Sang Hyun Park, Zhiyong Liu, Teng Yang, Zhidong Zhang, Lei Shao, Xuesong Li, Tony Low, Yi Shi, Xiaomu Wang
Summary: This study reports the direct observation of two new plasmon modes in macroscopic twisted bilayer graphene (tBLG) with a highly ordered moiré superlattice. These modes include chiral plasmons arising from the uncompensated Berry flux of the electron gas under optical pumping, and slow plasmonic modes resulting from interband transitions in AB-stacked domains. These findings are important for understanding the electromagnetic dynamics of small-angle tBLG and enabling strong light-matter interactions in the mid-wave infrared spectral window.
Article
Multidisciplinary Sciences
Shishu Zhang, Jianqi Huang, Yue Yu, Shanshan Wang, Teng Yang, Zhidong Zhang, Lianming Tong, Jin Zhang
Summary: The authors demonstrate that quantum interference can result in significant chiral Raman response in a monolayer material of transitional metal dichalcogenide with triclinic symmetry. This finding provides a new manifestation of quantum interference in the Raman scattering process and may inspire the induction of chiral optical response in other materials.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Bo Xu, He Hao, Jianqi Huang, Yan Zhao, Teng Yang, Jin Zhang, Lianming Tong
Summary: Through helicity-resolved Raman spectroscopy, we have observed for the first time the intra-mini valley phonon scattering pathways near the saddle points in twisted bilayer graphene. Two new Raman modes were observed and assigned to combination modes of different optical and acoustic modes. These findings are important for a deeper understanding of the electronic band structure and the enhanced electron-phonon interaction in twisted bilayer graphene.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Ying-Ying Dai, Han Wang, Teng Yang, Adekunle O. Adeyeye, Zhi-Dong Zhang
Summary: In this study, the coexistence of circular and elongated skyrmions in helimagnetic films under zero field is observed. It is found that the elongated skyrmions are determined by the intrinsic DMI and carry the same topological charge as the circular ones.
Article
Chemistry, Physical
Linyi Wu, Yipei Li, Binghua Zhou, Jian Liu, Deliang Cheng, Shien Guo, Keng Xu, Cailei Yuan, Mingxi Wang, Gan Jet Hong Melvin, Josue Ortiz-Medina, Sajjad Ali, Teng Yang, Yoong Ahm Kim, Zhipeng Wang
Summary: Coupling graphene-based materials with SiC nanostructures is an effective strategy for improving photocatalytic CO2 reduction performance. In this study, vertical graphene (VG) sheets were synthesized on SiC nanowires derived from rice husks to form the VG@SiC/C composite. The resulting composite exhibited enhanced photocatalytic CO2 reduction, yielding CO and CH4 with yields of 25.5 and 2.3 μmol g-1 h-1, respectively, which is the highest CO yield among SiC-based photocatalysts. Defective VG sheets promoted sunlight absorption, CO2 adsorption and activation, electron-hole pair separation, and overall photocatalyst activity, leading to high CO2 reduction yield and selectivity.
Article
Materials Science, Multidisciplinary
Mengru Cong, Han Ge, Lei Zhang, Weijun Ren, Nan Zhao, Tiantian Li, Shanmin Wang, Jinlong Zhu, Jiawei Mei, Qiang Zhang, Jieming Sheng, Fei Gao, Bing Li, Zhidong Zhang, Liusuo Wu
Summary: Geometrical frustration and strong quantum fluctuations in a two-dimensional triangular antiferromagnet, NdAuAl4Ge2, were studied. Thermodynamic and transport measurements were performed, revealing multiple phase transitions and anisotropy under magnetic field. The resistivity measurements indicated that NdAuAl4Ge2 is a good metal.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Quantum Science & Technology
Fei Gao, Jianqi Huang, Weijun Ren, Hengheng Wu, Meng An, Xueliang Wu, Long Zhang, Tianran Yang, Aifeng Wang, Yisheng Chai, Xinguo Zhao, Teng Yang, Bing Li, Zhidong Zhang
Summary: This research investigates the magnetic properties, magneto-resistivity, Hall resistivity, Seebeck coefficient, and heat capacity of a magnetic topological nodal-line semimetal TbSbTe. The calculated energy-band structures show two nodal rings and a Fermi surface with electron and hole pockets. Multiple magnetic phase transitions occur at critical magnetic fields. The electrical resistivity shows a hump-like feature, a positive slope above a certain temperature, and a negative slope below that temperature. The magnetoresistance changes from a semi-classical H-2 dependence to a linear-field dependence, indicating a Dirac linear energy dispersion. TbSbTe may be used for studying topological physics and designing devices based on topological quantum materials.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Chemistry, Multidisciplinary
Lingli Li, Xiaoqi Li, Yizhuo Li, Biaohong Huang, Ji Qi, Khimananda Acharya, Lei Zhang, Zhaosheng Wang, Teng Yang, Zheng Han, Bing Li, Xiaoming Jiang, Tula R. Paudel, Weijin Hu, Zhidong Zhang
Summary: In this study, the crystal structure and electrical properties of a 2D hybrid perovskite (PVK-Br) were investigated, revealing consecutive phase transitions from ferroelectric-I (FE1) to ferroelectric-II (FE2) and then to antiferroelectric (AFE). Field-induced AFE to FE transition near room temperature enabled a large energy storage density of approximately 1.7 J cm(-3) and a wide working temperature span of about 70 K, both of which are among the best in hybrid AFEs. The good energy storage performance was attributed to the cooperative coupling between the [PbBr6] octahedral framework and the benzylamine molecules.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Mingze Li, Dan Han, Zhenhua Wang, Bing Li, Teng Yang, Zhe Zhang, Fei Gao, Han Wang, Xinguo Zhao, Da Li, Zhidong Zhang
Summary: This study reports the magnetic and transport properties of the antiperovskite Eu3SnO, which is identified as a topological semimetal by first-principles calculations. A metastable canted antiferromagnetic state and anomalies in magnetoresistance and Hall resistance are observed. The coexistence of Eu2+ and Eu3+ is found, indicating dual properties of the f -orbital electrons. The phase diagram shows four magnetic-ordered regions and opens up possibilities for investigating antiferromagnetic topological semimetals.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Tianran Yang, Liyu Zhang, Chin -Wei Wang, Fei Gao, Yuanying Xia, Pengfei Jiang, Long Zhang, Xinrun Mi, Mingquan He, Yisheng Chai, Xiaoyuan Zhou, Huixia Fu, Weijun Ren, Aifeng Wang
Summary: Single crystals of LaMn0.86Sb2 were synthesized using the flux method. Band structure calculations confirmed the presence of Dirac dispersion below the Fermi level, as expected for square-net-based materials. Magnetization measurements and neutron diffraction analysis revealed a G-type antiferromagnetic structure with weak spin canting below TN = 146 K. A spin-flop transition was observed with external magnetic fields applied parallel to the c-axis. Negative magnetoresistance at low temperatures suggests a spin alignment effect. LaMn1-xSb2 demonstrates Dirac dispersion and tunable magnetism due to vacancies, making it a potential platform for studying the interplay of magnetism, charge transport, and topological bands.
Article
Chemistry, Inorganic & Nuclear
Fei Gao, Weijun Ren, Hengheng Wu, Meng An, Xinguo Zhao, Bing Li, Zhidong Zhang
Summary: We reported the synthesis and properties of the metallic triangular lattice antiferromagnetic DyAl2Ge2 single crystal, including the magnetic transition, metallic behavior, and magnetocaloric effect.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
