Magnetisation reversal in cylindrical nickel nanobars involving magnetic vortex structure: A micromagnetic study |
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| Authors: | Prabeer Barpanda |
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| Affiliation: | 1. Laboratoire de Réactivité et Chimie des Solides, Universite de Picardie Jules Verne, 33 rue Saint Leu, Amiens Cedex 80039, France;2. Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada B3H 3J5;1. Department of Physics, Bangalore University, Bangalore, Karnataka, 560056 India;2. Materials Research Centre, Indian Institute of Science, Bangalore, 560012 India;3. Center for Application of Radioisotopes and Radiation Technology, Mangalore University, Mangalore, 574199 India;4. Department of Physics, National Taiwan Normal University, Taipei, 11677 Taiwan;1. Department of Energy Engineering, Hanyang University, Seoul, 133-791, Republic of Korea;2. Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA;3. Department of Materials Science and Engineering, Hanyang University, Seoul, 133-791, Republic of Korea;4. Center for Energy Convergence Research, Green City Technology Institute, Korea Institute of Science and Technology, Seoul, 136-791, Republic of Korea;1. College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China;2. School of Chemical Engineering & Pharmacy, Wuhan Institute of Technology, Wuhan 430072, PR China;1. Dept of Materials Science & Engineering, Northwestern University, Evanston, IL, USA;2. Dept of Metallurgical Engineering & Materials Sciences, Indian Institute of Technology Bombay, Mumbai, India;3. Centre for Research in Nanotechnology & Sciences, Indian Institute of Technology Bombay, Mumbai, India;4. Radiation Biology & Health Sciences Division, Bhabha Atomic Research Centre, Mumbai, India;5. International Institute of Nanotechnology, Northwestern University, Evanston, IL, USA |
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| Abstract: | A three-dimensional, Fast-Fourier-Transformed (3D-FFT) micromagnetic simulation was employed to study the magnetization reversal mechanisms in cylindrical nickel nanobars possessing magnetic vortices. Individual Ni nanobars of height 150–250 nm with aspect ratio varying from 2.1 to 2.5 were considered, all of them supporting magnetic vortices domains. Magnetization reversal in these nanobars involves the vortex-creation–annihilation (VCA) mechanism with an inversion symmetry feature observed mid-way during reversal process. The effect of incidence angle of externally applied field on overall magnetization reversal process is examined in detail. The corresponding variations in coercivity, squareness, exchange energy and vortex parameters are described by the micromagnetic study that can shed insights for building practical Ni nanobars magnetic nanostructures/devices. |
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