Effect of the intergrain interactions on the coercivity and its angular dependence for Nd(FeCo)B sintered magnets |
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| Institution: | 1. Physics Department, Shandong University, 250100 Jinan, People''s Republic of China;2. Central Iron & Steel Research Institute, 100081 Beijing, People''s Republic of China;1. Departemen Fisika, FMIPA Universitas Indonesia, Depok, 16424, Indonesia;2. Research Center for Physics, Indonesian Institute of Sciences (LIPI), Bld 440, Puspiptek Office Area, Tangerang Selatan, Indonesia;3. Department of Physics, Chungbuk National University, Cheongju, 28644, South Korea;1. Departamento de Física, Universidade Federal de Pernambuco, Recife, PE 50670-901, Brazil;2. Pós-Graduação em Ciência de Materiais, Universidade Federal de Pernambuco, Recife, PE 50670-901, Brazil;3. Universidade Federal de Lavras, Lavras, MG 37200-000, Brazil;1. Corrosion and Protection Center, Key Laboratory for Environmental Fracture (MOE), University of Science and Technology Beijing, Beijing, 100083, PR China;2. Institute of Circular Economy, Beijing University of Technology, Beijing, 100124, PR China;3. Department of Mechanical Engineering, University of South Florida, Tampa, FL, 33620, USA;1. State Key Lab for Turbulence and Complex Systems, Peking University, Beijing 100871, China;2. Department of Mechanics, Beijing Jiaotong University, Beijing 100044, China |
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| Abstract: | Effects of interactions between grains with different alignment degrees on the coercivity and its angular dependence for Nd16(Fe0.8Co0.2)78B6 sintered magnets have been studied. The experiments show that the intrinsic coercivity jHc decreases with enhancing grain alignment (decreasing alignment coefficient σ), the coercivity jHc(θ) increases with increasing angle θ between the applied field and the texture axis of the magnets and the variation ratio is larger for the magnets with better grain alignment. The coercivity of the magnets should be determined by the critical field making the moment of individual grains reverse and the interactions between the grains. For the sintered magnets composed of the grains with μm size, the magnetostatic interaction between the grains is stronger than the exchange coupling interaction and it makes the coercivity of magnet increase with increasing alignment coefficient σ. Taking into account the intergrain interactions, the starting field theory of coercivity is in good agreement with the experimental results for Nd16(Fe0.8Co0.2)78B6 sintered magnets. |
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