Grain size effect on the Neel temperature and magnetic properties of nanocrystalline NiFe2O4 spinel

被引：117

作者：

Chinnasamy, CN

Narayanasamy, A ^{[1
]}

Ponpandian, N

Joseyphus, RJ

Jeyadevan, B

Tohji, K

Chattopadhyay, K

机构：

[1] Tohoku Univ Aramaki, Dept Geosci & Technol, Aoba Ku, Sendai, Miyagi 9808579, Japan

[2] Univ Madras, Ctr Mat Sci, Dept Nucl Phys, Madras 600025, Tamil Nadu, India

[3] Indian Inst Sci, Dept Met, Bangalore 560012, Karnataka, India

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2002年 / 238卷 / 2-3期

关键词：

Neel temperature; ferrimagnet; Hopkinson effect; fine particle;

D O I：

10.1016/S0304-8853(01)00928-3

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nanocrystalline NiFe2O4 spinel ferrites with various grain sizes have been synthesized by ball milling the bulk NiFe2O4. The average grain sizes were estimated from the X-ray line broadening of the (3 1 1) reflection. The Neel temperatures of NiFe2O4 for various grain sizes were determined by magneto thermogravimetric method. The magnetic behaviour has been explained by combining the effects of changes in cation distribution on milling and finite size scaling. The shift in B-H loops has been correlated to the surface spin effects. The high coercivities observed here may be due to high anisotropies of the milled samples. The Hopkinson peak observed just below the Neel temperature has been explained by the mathematical formalism given by the Stoner Wohlfarth model. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：281 / 287

页数：7

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