Modeling of magnetic material displaying magnetic aftereffect with slow decay rates |
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| Authors: | S Gu Y Jin P Chen C Yan E Della Torre LH Bennett |
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| Institution: | 1. Helmholtz-Institut Jena, Fröbelstieg 3, D-07743 Jena, Germany;2. Friedrich-Schiller-Universität Jena, Institut für Festkörperphysik, Helmholtzweg 5, D-07743 Jena, Germany;1. Key Laboratory of Inorganic Functional Material and Device, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;1. National Synchrotron Radiation Laboratory, Collaborative Innovation Center of Chemistry for Energy Materials, University of Science and Technology of China, Hefei, Anhui 230029, PR China;2. CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, PR China;3. Center for Micro- and Nanoscale Research and Fabrication, Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of China, Hefei, Anhui 230027, PR China;4. Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of China, Hefei, Anhui 230027, PR China;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. School of Materials Science and Engineering, Nanchang University, Nanchang, 330031, China;3. School of Physics, Southeast University, Nanjing, 211189, China;4. Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics, and Collaborative Innovation Center of Advanced Microstructures, University of Science and Technology of China, Hefei, 230026, China |
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| Abstract: | For magnetic materials that display slow decay rates, the entire relaxation process cannot be observed experimentally within a reasonable time interval. While magnetic aftereffect behavior has been understood and analyzed quantitatively in general, the important parameters of magnetic materials with slow decay cannot be easily extracted. We present comprehensive experimental characterization of time, field, and temperature dependence of magnetic properties of a magnetic nanocomposite, which exhibits slow decay. Based on the measurement results and previously developed Preisach–Arrhenius model, we propose an analytical model that can predict the shape of the entire aftereffect curves at different temperatures with only the major hysteresis loop and one aftereffect curve at a specific holding field within the region of interest. The model is validated with both simulated data and measured data. This model allows the derivation of an analytical formula for the time variation of the magnetization based on a Gaussian distribution. |
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