| 铁磁纳米颗粒系统磁性质对尺寸和各向异性效应的依赖 |
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| 引用本文： | 郑勇林.铁磁纳米颗粒系统磁性质对尺寸和各向异性效应的依赖[J].云南大学学报(自然科学版),2008,30(3):276-280. |
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| 作者姓名： | 郑勇林 |
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| 作者单位： | {{if article.pacs && article.pacs != '}}PACS: {{article.pacs}}{{/if}} |
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| 基金项目： | 重庆市教委资助项目
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重庆涪陵师范学院重点学科建设基会资助课题 |
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| 摘 要： | 研究了随机分布颗粒系统的尺寸、各向异性、矫顽力和温度之间的关系.从FexCu1-x,Fe/SiO2,Fe/Al2O3颗粒膜实验结果入手,以Néel-Bron理论和Storner-Wohlfartly模型为依据,建立了描述细磁性颗粒矫顽力Hc与颗粒大小d、热力学温度T的函数关系,并得出在粒径小于dm(=18~20 nm)范围内,矫顽力随着颗粒的尺寸的增加而迅速地增大,而在颗粒尺寸大于这个范围,则按照Hc∝1/d规律变化.
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| 关 键 词： | 纳米颗粒尺寸 各向异性 矫顽力 纳米颗粒磁效应 |
| 文章编号： | 0258-7971(2008)03-0276-05 |
| 修稿时间： | 2007年9月6日 |
The character of ferromagnetic nanoparticle system depend to particle size and anisotropy effects |
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| ZHENG Yong-lin.The character of ferromagnetic nanoparticle system depend to particle size and anisotropy effects[J].Journal of Yunnan University(Natural Sciences),2008,30(3):276-280. |
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| Authors: | ZHENG Yong-lin |
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| Institution: | {{if article.pacs && article.pacs != '}}PACS: {{article.pacs}}{{/if}} |
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| Abstract: | It was studied that relation of particle size, anisotropy,and temperature.A relation of coercivity (Hc),particle size (d),and temperature (T) was built by according to experimental results of Fe/SiO2,Fe/Al2O3 and Fe0.3Cu0.7 granular filem,and Néel-Bron theory and the Stoner-Wohlfarth model.It was found that the coercive force is granular films as a function of particle diameter (d).With increasing the particle size,Hc increases abruptly and attains maximum around dm (=18-20 nm),and then decreses as Hc∝1/d. |
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| Keywords: | nanoparticles size anisotropy effects coercivity force nanoparticles magnetic effects |
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