| 表面效应对γ-Fe2O3微粉饱和磁化强度的影响 |
| |
| 引用本文： | 罗河烈,文亦汀,孙克,冯远冰,黄锡成.表面效应对γ-Fe2O3微粉饱和磁化强度的影响[J].物理学报,1983,32(6):812-818. |
| |
| 作者姓名： | 罗河烈 文亦汀 孙克 冯远冰 黄锡成 |
| |
| 作者单位： | 中国科学院物理研究所 |
| |
| 摘 要： | 我们制备了直径为80—700A的γ-Fe2O3微粉,测量了它的比饱和磁化强度σs和比表面积Sa,得出经验公式:σs(s=σs(∞)(1—aSa)。假定微粉由两部分组成:第一部分是表面层,在磁场的作用下,它的磁矩只能转到与磁场成某个角度;第二部分是内部,它的磁矩可以转到磁场的方向。从这个简单的模型出发,上述的经验公式可以得到较好的解释。
关键词：
|
| 收稿时间： | 1982-07-10 |
SURFACE EFFECTS ON SATURATION MAGNETIZATION OF FINE γ-Fe2O3 PARTICLES |
| |
| Luo He-lie,Wen Yi-ting,Sun Ke,Feng Yuan-bing and Huang Xi-cheng.SURFACE EFFECTS ON SATURATION MAGNETIZATION OF FINE γ-Fe2O3 PARTICLES[J].Acta Physica Sinica,1983,32(6):812-818. |
| |
| Authors: | Luo He-lie Wen Yi-ting Sun Ke Feng Yuan-bing and Huang Xi-cheng |
| |
| Abstract: | Fine γ-Fe2O3 particles with diameter of 80-700? were prepared. Their saturation magnetization per unit mass σs and specific surface area Sa were measured. An empirical formula σs(s) = σs(∞(1-aSa) was obtained. It was proposed that the fine particles consist of two parts: the first part is the surface layer, whose magnetic moment can not be turned entirely to the field direction by the applied magnetic field, but make an average angle (canting angle) with the field. The second is the inner part of the particles, whose magnetic moment can be aligned along the direction of the applied magnetic field. The above empirical formula can be interpreted very well by this simple model.
Keywords： |
| |
| Keywords: | |
|
| 点击此处可从《物理学报》浏览原始摘要信息 |
| 点击此处可从《物理学报》下载免费的PDF全文 |
|
