| 相分布和晶粒尺寸对Nd2Fe14B/ɑ-Fe纳米复合永磁材料矫顽力的影响 |
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| 引用本文： | 冯维存,高汝伟,李卫,韩广兵,孙艳.相分布和晶粒尺寸对Nd2Fe14B/ɑ-Fe纳米复合永磁材料矫顽力的影响[J].中国物理 B,2005,14(8):1649-1652. |
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| 作者姓名： | 冯维存 高汝伟 李卫 韩广兵 孙艳 |
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| 作者单位： | Division of Functional Materials, Central Iron and Steel Research Institute, Beijing 100081, China;School of Physics & Microelectronics, Shandong University,Ji'nan 250100, China;School of Physics & Microelectronics, Shandong University,Ji'nan 250100, China;Division of Functional Materials, Central Iron and Steel Research Institute, Beijing 100081, China;School of Physics & Microelectronics, Shandong University,Ji'nan 250100, China;School of Physics & Microelectronics, Shandong University,Ji'nan 250100, China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China (Grant Nos 50371019 and 50371046) and the Doctorate Foundation of the State Education Ministry of China (Grant No 20040422012). |
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| 摘 要： | 本文采用统计平均方法研究了软、硬磁性晶粒尺寸及相分布对Nd2Fe14B/α-Fe纳米复合永磁材料矫顽力的影响。计算结果表明：对于单相纳米硬磁材料，磁体矫顽力随着硬磁性晶粒尺寸的减小而降低；对于软、硬两磁性相组成的Nd2Fe14B/a-Fe纳米复合永磁材料，两相的随机分布将导致磁体矫顽力随硬磁性晶粒尺寸的减小呈现极大值。本文的计算结果还表明当硬磁性晶粒尺寸大于软磁性晶粒的最佳尺寸时(15nm)，具有多层膜结构的Nd2Fe14B/a-Fe纳米复合永磁材料将比两相随机分布时具有更大的矫顽力。
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| 关 键 词： | 纳米复合Nd2Fe14B/ɑ-Fe永磁体 矫顽力 晶粒尺寸 相分布 交换耦合相互作用 |
| 收稿时间： | 2005-01-14 |
Dependence of coercivity on phase distribution and grain size in nanocomposite Nd2Fe14B/ɑ-Fe magnets |
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| Feng Wei-Cun,Gao Ru-Wei,Li Wei,Han Guang-Bing and Sun Yan.Dependence of coercivity on phase distribution and grain size in nanocomposite Nd2Fe14B/ɑ-Fe magnets[J].Chinese Physics B,2005,14(8):1649-1652. |
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| Authors: | Feng Wei-Cun Gao Ru-Wei Li Wei Han Guang-Bing and Sun Yan |
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| Institution: | Division of Functional Materials, Central Iron and Steel Research Institute, Beijing 100081, China; Division of Functional Materials, Central Iron and Steel Research Institute, Beijing 100081, China;School of Physics & Microelectronics, Shandong University,Ji'nan 250100, China; School of Physics & Microelectronics, Shandong University,Ji'nan 250100, China |
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| Abstract: | The dependence of coercivity on the grain size in nanocomposite Nd2Fe14B/ɑ-Fe magnets with different distributions of magnetically soft and hard phases is investigated by means of statistical mean. The calculations show that when there exists no soft phase, the coercivity of magnets decreases monotonically with hard grain size reducing. For a given volume fraction of hard phase, the coercivity of nanocomposite Nd2Fe14B/ɑ-Fe magnets with a random distribution of soft and hard grains shows a peak value as a function of hard grain size. When the hard grain size is larger than an optimum value of soft grain size (15nm), the nanocomposite Nd2Fe14B/ɑ-Fe magnets with the multilayer structure of soft and hard grains can possess a higher coercivity than that with the random distribution of soft and hard grains. |
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| Keywords: | nanocomposite Nd2Fe14B/ɑ-Fe magnets coercivity grain size phase distribution exchange-coupling interaction |
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