Magnetostatic interactions in planar ring-like nanoparticle structures |
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| Affiliation: | 1. M. V. Lomonosov Moscow State University, 119992, Moscow, Russia;2. Lund University, Solid State Physics/Nanometer Consortium, Box 118, SE-221 00, Lund, Sweden;1. Department of Chemistry, Nanchang University,999 Xuefu Avenue, Nanchang 330031, China;2. Department of Chemistry and the Tsinghua Center for Frontier Polymer Research, Tsinghua University, Beijing, 100084, China;1. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China;2. Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane 4072, Australia;1. Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, 398 Ruoshui Road, Dushu Lake Higher Education Town, Suzhou Industrial Park, Suzhou, 215125, China;2. University of Chinese Academy of Sciences, 19(A) Yuquan Road, Beijing, 100039, China;3. China Pharmaceutical University, 639 Longmian Avenue, Jiangning District, Nanjing, 211198, China;1. Institute of Biomedical and Pharmaceutical Technology, Fuzhou University, Fuzhou, 350002, China;2. Department of Gynecology, Fujian Cancer Hospital & Fujian Medical University Cancer Hospital, Fuzhou, 350014, China;3. State Key Lab of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China;4. Key Laboratory of Biomedical Material of Tianjin, Institute of Biomedical Engineering, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin, 300192, China;1. Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, PR China;2. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), PR China;1. Biomedical Barriers Research Center, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin Key Laboratory of Biomedical Materials, Tianjin, 300192, China;2. Department of Otorhinolaryngology Head and Neck Surgery, Tianjin First Central Hospital, Tianjin, 300192, China;3. Institute of Otolaryngology of Tianjin, Tianjin, 300192, China |
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| Abstract: | Numerical calculations of equilibrium state energies and local magnetic fields in planar ring-like nanoparticle structures were performed. The dipole–dipole, Zeeman and magnetic anisotropy interactions were included into the model. The result of their competition depends on the value of the external magnetic field, magnetic parameters of an individual nanoparticle, size and shape of the structures. Flux-closed vortexes, single domain, two-domain “onion”-like, “hedgehog”-like and more complex spin structures can be realized. The critical field, providing a sharp transition from the flux-closed vortex to the “onion”-like state, can be regulated by a variation of the particle magnetization and anisotropy constant, their easy directions, and particle space arrangement. |
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