Particle size effects and surface anisotropy in Fe-based granular films

被引：85

作者：

Chen, C ^{[1
]}

Kitakami, O ^{[1
]}

Shimada, Y ^{[1
]}

机构：

[1] Tohoku Univ, Sci Measurements Res Inst, Sendai, Miyagi 9808577, Japan

来源：

JOURNAL OF APPLIED PHYSICS | 1998年 / 84卷 / 04期

关键词：

D O I：

10.1063/1.368281

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Structure and magnetic properties of Fe/SiO2 and Fe/Al2O3 granular films were studied in the particle size (d) range of 1-50 nm. The coercivity (H-c) shows a maximum around 600 Oe at the particle size dm approximate to 18 nm, and then decreases in the larger particle size range for both Fe/SiO2 and Fe/Al2O3 systems at room temperature. A relation of coercivity, particle size, and temperature was built by using the Neel-Brown theory and the Stoner-Wohlfarth model basically. The experimental results were successfully fitted by assuming that the alpha-Fe particles possess uniaxial surface anisotropy K-s approximate to 0.4 erg/cm(2). (C) 1998 American Institute of Physics. [S0021-8979(98)01916-1].

引用

页码：2184 / 2188

页数：5

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