Magnetization reversal mechanism of anisotropic HDDR Nd2Fe14B-based magnet powder |
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| Institution: | 1. The Key Laboratory of Advanced Functional Materials, Materials Science and Engineering, Ministry of Education, Beijing University of Technology, Chaoyang District, Pingleyuan 100, Beijing 100022, People''s Republic of China;2. School of Materials Science and Engineering, University of Science and Technology, Beijing, Beijing 100083, People''s Republic of China;1. Riga Technical University, Institute of Silicate Materials, Valdena Str. 3, LV1048 Riga, Latvia;2. Riga Technical University, Institute of Inorganic Chemistry, Valdena Str. 3, LV1048 Riga, Latvia;1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China;2. Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China;1. College of Mechanical and Material Engineering, North China University of Technology, Beijing 100144, PR China;2. State Key Laboratory of Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, PR China;1. School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, Zhejiang, China;2. Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, CAS, Ningbo 315201, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;1. Research Center for Magnetic and Spintronic Materials, National Institute for Materials Science, Tsukuba 305-0047, Japan;2. Department of Applied Physics, Tohoku University, Sendai 980-8579, Japan;3. Center for Spintronics Research Network, Tohoku University, Sendai 980-8577, Japan |
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| Abstract: | The coercivity mechanism of anisotropic Nd2Fe14B-based magnetic powders prepared by hydrogenation–decomposition–esorption–recombination process was studied. Polarization and corresponding differential susceptibility curves of the powders in its thermally demagnetized state were measured. Microstructure and constituents of the powders were investigated by means of transmission electron microscope and scanning electron microscope with energy dispersive X-ray detector. In addition, theoretical calculation of the intrinsic coercive force of the magnetic powders was performed. It is concluded that the magnetic hardening mechanism of the powders is the pinning of domain walls at grain boundaries of the Nd2Fe14B main phase and Nd-rich phase that distributes homogeneously around some conglomerations composed of fine Nd2Fe14B grains. The coercive force of the powders is mainly determined by the pinning of domain walls by Nd-rich boundary phase. |
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