Article
Physics, Multidisciplinary
Jing Xia, Xichao Zhang, Xiaoxi Liu, Yan Zhou, Motohiko Ezawa
Summary: We propose a skyrmion-based universal quantum computer that utilizes the helicity degree of freedom in frustrated magnets. It is shown that the quantum computation can be achieved based on nanoscale skyrmions in a magnetic bilayer system. Single-qubit gates are realized by controlling the electric field and spin current, while the two-qubit gate is achieved through Ising-type exchange coupling. The advantage of this mechanism is the elimination of the need for an external magnetic field. Our results may pave the way for universal quantum computation based on nanoscale topological spin textures.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Z. Jin, T. T. Liu, Y. Liu, Z. P. Hou, D. Y. Chen, Z. Fan, M. Zeng, X. B. Lu, X. S. Gao, M. H. Qin, J-M Liu
Summary: This theoretical study investigates the effect of skyrmion helicity oscillation on the magnon-driven dynamics of frustrated skyrmions. The results show that the oscillation effectively suppresses Hall motion and modulates the scattering cross-section of injected magnons, providing a comprehensive understanding of magnon-skyrmion scattering in frustrated magnets.
NEW JOURNAL OF PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Jing Xia, Xichao Zhang, Xiaoxi Liu, Yan Zhou, Motohiko Ezawa
Summary: In this study, we investigate the evolution of the helicity wave in a frustrated magnetic multilayer system, where a skyrmion string is formed. By rotating the helicity of the skyrmion in the bottommost layer as the initial condition, we can detect whether the system is topological or trivial. Our results show that the helicity dynamics of the skyrmion string have rich physics in the modulated exchange-coupled system.
Article
Chemistry, Multidisciplinary
Jialiang Jiang, Jin Tang, Yaodong Wu, Qi Zhang, Yihao Wang, Junbo Li, Yimin Xiong, Lingyao Kong, Shouguo Wang, Mingliang Tian, Haifeng Du
Summary: This study reports on the reliable manipulation of the skyrmion number using electrical current in nanostructured devices, with successful numerical reproduction of experimental results.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Christina Psaroudaki, Christos Panagopoulos
Summary: We derive the quantization of magnetic helicity in the solid state and demonstrate tunable macroscopic quantum tunneling, coherence, and oscillation for a stabilized skyrmion spin texture in frustrated magnets. We also discuss the parameter space for experimental realization of quantum effects.
Article
Multidisciplinary Sciences
Anne Bernand-Mantel, Cyrill B. Muratov, Valeriy V. Slastikov
Summary: In this study, the continuum micromagnetic framework is used to derive formulas for compact skyrmion lifetime in ultrathin ferromagnetic films. The formulas take into account the effect of thermal noise and the relatively weak interfacial Dzyaloshinskii-Moriya interaction. When there is no saddle point connecting the skyrmion solution to the ferromagnetic state, the skyrmion collapse event is interpreted as capture by a microscale absorber.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Materials Science, Multidisciplinary
Lan Bo, Rongzhi Zhao, Chenglong Hu, Xichao Zhang, Xuefeng Zhang, Masahito Mochizuki
Summary: In this study, a method for creating skyrmion bags in thin-film nanodisks is proposed, involving three steps: enlarging the size of the outer skyrmion using a vertical magnetic field, nucleating inner skyrmions at an off-center area through local current injection, and reconstructing the system through multiple interskyrmion potentials. As a result, skyrmion bags with a maximum topological charge of 40 can be created. Simulated Lorentz transmission electron microscopy images are provided to facilitate experimental demonstration. This research is expected to inspire relevant experiments in magnetic films and pave the way for potential spintronic applications based on skyrmion bags.
Article
Multidisciplinary Sciences
P. Padmanabhan, F. L. Buessen, R. Tutchton, K. W. C. Kwock, S. Gilinsky, M. C. Lee, M. A. McGuire, S. R. Singamaneni, D. A. Yarotski, A. Paramekanti, J-X Zhu, R. P. Prasankumar
Summary: The authors investigate the coupling between magnetically ordered spins and lattice distortions in CrI3 using ultrafast optical spectroscopy, revealing a coherent spin-coupled phonon mode. This discovery adds to the understanding of van der Waals materials and provides a new platform for exploring the optical control of magnetic and vibrational degrees of freedom at the nanoscale.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Applied
R. L. Silva, R. C. Silva, A. R. Pereira
Summary: The topological stability of skyrmions is crucial for their use in new technologies. The controlled manipulation of skyrmion configuration, such as polarity and chirality, may play a significant role. Investigating the skyrmion oscillatory motion in a hybrid nanodisk can provide new functionalities for skyrmion-based logic devices.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Satoru Hayami
Summary: The theoretical investigation reveals that a skyrmion crystal (SkX) can be realized in frustrated triangular magnets with easy-plane single-ion anisotropy by applying an in-plane magnetic field. In addition to SkX, multiple-Q states are also stabilized in the presence of easy-plane anisotropy. This study provides a new possibility to explore SkX in easy-plane frustrated magnets.
Article
Physics, Applied
Zhong Shen, Yufei Xue, Zebin Wu, Changsheng Song
Summary: We report a CrISe monolayer as a room temperature ferromagnetic semiconductor with high Curie temperature, magnetic anisotropy energy, and bandgap. The magnetic properties can be further enhanced by strain, and the magnetic easy axis can be switched by compressive strain. Stable skyrmions with sub-10 nm radius can be achieved above room temperature through micromagnetic simulations. This work is important for the development of next-generation skyrmion-based information storage devices and the study of magnetic skyrmions in room temperature ferromagnetic semiconductors.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Satoru Hayami, Ryota Yambe
Summary: We theoretically investigate the stability of a square skyrmion crystal (SkX) in a centrosymmetric tetragonal lattice structure with the emphasis on the role of the magnetic anisotropy. Our study reveals that the presence of an off-diagonal spin component, due to the broken vertical mirror symmetry, leads to the formation of square SkXs with a definite helicity in an external magnetic field. The competition between the off-diagonal and diagonal anisotropic interactions determines the helicity of the square SkXs, and physical phenomena such as antisymmetric spin polarization and magnetoelectric effects are discussed. Additionally, the stability of SkXs with different helicities in a magnetic field rotation is examined.
Article
Multidisciplinary Sciences
Shiyuan Wang, Yao Wang, Shaohua Yan, Cong Wang, Bingke Xiang, Keyi Liang, Qiushi He, Kenji Watanabe, Takashi Taniguchi, Shangjie Tian, Hechang Lei, Wei Ji, Yang Qi, Yihua Wang
Summary: In this study, we utilized highly sensitive susceptometry to investigate the unconventional two-dimensional phase transition behavior induced by the competition between anisotropies in ABC-stacked CrBr3.
Article
Materials Science, Multidisciplinary
M. Mohylna, F. A. Gomez Albarracin, M. Zukovic, H. D. Rosales
Summary: This study reveals the emergence of a spontaneous antiferromagnetic skyrmion/antiskyrmion lattice in the classical Heisenberg antiferromagnet on the triangular-lattice under magnetic fields. These findings are significant for the research on antiferromagnetic skyrmions in centrosymmetric materials or lattices with relatively weak Dzyaloshinskii-Moriya interaction.
Article
Physics, Applied
Chao Chen, Dahai Wei, Liang Sun, Na Lei
Summary: We suppress the skyrmion Hall effect and enable the motion of skyrmions along the driven current by constructing artificial tracks using standing surface acoustic waves (SSAWs). Through micro-magnetic simulations and an analytical model, we identify the key parameters for eliminating the skyrmion Hall effect and demonstrate a reconfigurable multichannel skyrmion racetrack.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Multidisciplinary
Linlin Li, Jia Luo, Jing Xia, Yan Zhou, Xiaoxi Liu, Guoping Zhao
Summary: Skyrmions in synthetic antiferromagnetic (SAF) systems have recently gained attention for their stability, mobility, and skyrmion Hall effect. They are promising for ultra-low energy and ultra-high density magnetic storage and computing devices. In this study, we theoretically investigate the motion of a skyrmion in an SAF bilayer racetrack and propose a logic gate that can realize different logic functions. Our work considers various effects and may contribute to utilizing SAF skyrmions as versatile information carriers for future energy-efficient logic gates.
Article
Nanoscience & Nanotechnology
Zichao Li, Ye Yuan, Rene Huebner, Lars Rebohle, Yan Zhou, Manfred Helm, Kornelius Nielsch, Slawomir Prucnal, Shengqiang Zhou
Summary: In this study, pure B20-CoSi thin films were successfully grown using millisecond-range flash-lamp annealing, and the phenomena of charge density wave and chiral anomaly were observed. This work presents a promising method for preparing thin films of other binary B20 transition-metal silicides.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Teng Xu, Yuxuan Zhang, Zidong Wang, Hao Bai, Chengkun Song, Jiahao Liu, Yan Zhou, Soong-Geun Je, Alpha T. N'Diaye, Mi-Young Im, Rong Yu, Zhen Chen, Wanjun Jiang
Summary: We propose a viable approach to design ferrimagnetic skyrmions with desired size and density by tuning the magnetic properties of Fe1-xTbx. This method could be useful for enabling high-density ferrimagnetic skyrmionics.
Article
Physics, Applied
Jing Ming Liang, Xu Wen Zhao, Yu Kuai Liu, Pei Gen Li, Sheung Mei Ng, Hon Fai Wong, Wang Fai Cheng, Yan Zhou, Ji Yan Dai, Chee Leung Mak, Chi Wah Leung
Summary: The magnetization reversal of terbium iron garnet (TbIG) thin films at different temperatures was studied using anomalous Hall effect measurements. The compensation temperature (T-comp) of TbIG thin films was determined and the effect of film thickness on T-comp was investigated. The results showed that T-comp increases with decreasing film thickness. Two possible origins for this behavior were proposed, including interfacial element diffusion and strain effects between TbIG films and Gd3Ga5O12 substrates. These findings have implications for the study of spintronic devices based on ultrathin rare-earth iron garnet thin films.
APPLIED PHYSICS LETTERS
(2023)
Article
Biochemistry & Molecular Biology
Yanran Zhao, Tengjiao Zhu, Shuai Han, Yanlei Dong, Yi Zhou, Yan Qiao, Yun Tian, Dong Qiu, Xiaozhong Qu
Summary: Development of bioactive bone and joint implants with superior mechanical properties is challenging in biomedical materials. Hydrogels face obstacles in their application as load-bearing scaffolds due to mechanical property and processability issues. In this study, we developed implantable composite hydrogels with excellent processability and ultrahigh stiffness. The hydrogels were shapeable and had a compressive modulus comparable to cancellous bone. They also exhibited cytocompatibility, osteogenic properties, and minimal volume shrinkage. The hydrogels were successfully used for fracture treatment in a rabbit model, preventing recollapse of the articular surface.
Review
Physics, Applied
Motohiko Ezawa, Shun Yasunaga, Tetsuya Iizuka, Akio Higo, Yoshio Mita
Summary: We propose a universal quantum computer based on a chain of carbon nanotube rotators with attached metallic plates. The rotational angle phi is the dynamical variable. The attached plate interacts electrostatically with two fixed plates connected to ground. Stable states with phi = 0 and phi = pi are achieved by applying voltage differences. We assign these states to qubit states 0 and 1, and construct universal quantum gates such as arbitrary phase-shift, NOT, and Ising gates by controlling voltage between plates.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Multidisciplinary
Jing Xia, Xichao Zhang, Xiaoxi Liu, Yan Zhou, Motohiko Ezawa
Summary: We propose a skyrmion-based universal quantum computer that utilizes the helicity degree of freedom in frustrated magnets. It is shown that the quantum computation can be achieved based on nanoscale skyrmions in a magnetic bilayer system. Single-qubit gates are realized by controlling the electric field and spin current, while the two-qubit gate is achieved through Ising-type exchange coupling. The advantage of this mechanism is the elimination of the need for an external magnetic field. Our results may pave the way for universal quantum computation based on nanoscale topological spin textures.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Sheng Yang, Yuelei Zhao, Kai Wu, Zhiqin Chu, Xiaohong Xu, Xiaoguang Li, Johan Akerman, Yan Zhou
Summary: This study investigates the dynamics and evolution of chiral spin textures in [Pt/Co](3)/Ru/[Co/Pt](3) multilayers and achieves reversible conversion between skyrmions and skyrmioniums. Additionally, the topological conversion from a skyrmionium to a skyrmion is observed. These findings represent a significant development that promises to expedite the advancement of spintronic devices.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Tongtong Zhang, Lingzhi Wang, Jing Wang, Zhongqiang Wang, Madhav Gupta, Xuyun Guo, Ye Zhu, Yau Chuen Yiu, Tony K. C. Hui, Yan Zhou, Can Li, Dangyuan Lei, Kwai Hei Li, Xinqiang Wang, Qi Wang, Lei Shao, Zhiqin Chu
Summary: The authors demonstrate the growth of robust and stable chaotic pattern of diamond microparticles containing SiV defects on silicon substrates. These microparticles can be used as anti-counterfeiting labels with high-capacity optical encoding and ultrahigh stability in extreme application scenarios. They can be practically applied in diverse fields immediately.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Bin He, Yue Hu, Chenbo Zhao, Jinwu Wei, Junwei Zhang, Yu Zhang, Chen Cheng, Jiahui Li, Zhuyang Nie, Yanxiang Luo, Yan Zhou, Shilei Zhang, Zhongming Zeng, Yong Peng, John Michael David Coey, Xiufeng Han, Guoqiang Yu
Summary: Magnetic skyrmions, as topologically protected noncollinear spin textures, are potential information carriers in next-generation spintronic devices due to their small size and low current density requirements. This study develops a zero-field exchange-biased skyrmion material and successfully integrates it into a magnetic tunnel junction (MTJ) device by inserting an iridium (Ir) layer to enhance exchange bias and thermal stability. The smallest zero-field skyrmions achieved a size of 100 nm at room temperature, and their integration into a perpendicularly magnetized MTJ represents a significant step towards the development of skyrmion-based spintronic devices.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Xiuzhen Yu, Naoya Kanazawa, Xichao Zhang, Yoshio Takahashi, Konstantin V. Iakoubovskii, Kiyomi Nakajima, Toshiaki Tanigaki, Masahito Mochizuki, Yoshinori Tokura
Summary: This study reports the on-demand creation of multiple topological states in a helimagnet Fe0.5Co0.5Ge, including merons, antimerons, bimerons, and skyrmions, and demonstrates the transformations among these states through the application of magnetic fields and electric currents. These findings offer new insights into the manipulation of noncollinear spin textures and have potential applications in various fields.
ADVANCED MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Xuefeng Wu, Xu Li, Wenyu Kang, Xichao Zhang, Li Chen, Zhibai Zhong, Yan Zhou, Johan Akerman, Yaping Wu, Rong Zhang, Junyong Kang
Summary: Researchers have successfully constructed millimetre-scale meron lattices that are stable at room temperature and under zero magnetic field, which can be used as spin injectors in light-emitting diodes to provide 22.5% circularly polarized electroluminescence. These meron lattices are topological particle-like structures created in in-plane magnetized magnetic films. The lattices can transfer chirality from merons to electrons and then to photons, and it has been demonstrated that they can be used as spin injectors in nitride-based light-emitting diodes, producing circularly polarized electroluminescence at room temperature and under zero magnetic field.
NATURE ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Motohiko Ezawa, Natsuko Ishida, Yasutomo Ota, Satoshi Iwamoto
Summary: We investigate laser emission at the interface of the topological and trivial phases in one dimension. The system is described by a generalized Su-Schrieffer-Heeger model with site-dependent hopping parameters involving the interface width parameter. We obtain a large area single-mode laser by making the interface width wide enough and find a series of analytic solutions of excited states based on supersymmetry quantum mechanics.
