Finite size effect on Neel temperature with Co3O4 nanoparticles

被引：89

作者：

He, Lin

Chen, Chinping ^{[1
]}

Wang, Ning

Zhou, Wei

Guo, Lin

机构：

[1] Peking Univ, Dept Phys, Beijing 100871, Peoples R China

[2] Beijing Univ Aeronaut & Astronaut, Sch Mat Sci & Engn, Beijing 100083, Peoples R China

来源：

JOURNAL OF APPLIED PHYSICS | 2007年 / 102卷 / 10期

基金：

中国国家自然科学基金; 高等学校博士学科点专项科研基金;

关键词：

D O I：

10.1063/1.2817481

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The finite size effect on the antiferromagnetic transition temperature, T-N, has been investigated with Co3O4 nanoparticles of 75, 35, and 16 nm in diameter. Along with the results from the previous experiments on the Co3O4 nanoparticles with average diameter of 8 and 4.3 nm, the variation of T-N with the particle diameter, d, appears to follow the finite size scaling relation. The shift exponent is determined as lambda=1.1 +/- 0.2 and the correlation length xi(0)=2.8 +/- 0.3 nm. The value of the shift exponent is consistent with the description by the mean field theory. (c) 2007 American Institute of Physics.

引用

页数：4

共 30 条

[1]

Aharoni A., 1996, Introduction to the Theory of Ferromagnetism

[2] Finite-size effects and uncompensated magnetization in thin antiferromagnetic CoO layers [J].