Superparamagnetic relaxation in α-Fe particles

被引：25

作者：

Bodker, F

Morup, S

Pedersen, MS

Svedlindh, P

Jonsson, GT

Garcia-Palacios, JL

Lazaro, FJ

机构：

[1] Tech Univ Denmark, Dept Phys, DK-2800 Lyngby, Denmark

[2] Univ Uppsala, Dept Mat Sci, S-75121 Uppsala, Sweden

[3] Ctr Politecn Super Ingn, ES-500015 Zaragoza, Spain

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1998年 / 177卷

关键词：

particles-ultrafine; superparamagnetism; relaxation-Neel; Mossbauer spectroscopy;

D O I：

10.1016/S0304-8853(97)00782-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The superparamagnetic relaxation time of carbon-supported alpha-Fe particles with an average size of 3.0 Mm has been studied over a large temperature range by the use of Mossbauer spectroscopy combined with AC and DC magnetization measurements. It is found that the relaxation time varies with temperature in accordance with Ni el's expression, tau = tau(0) exp (KV/kT) with tau(0) = (1.0 +/- 0.5) x 10(-10) s and K = (1.2 +/- 0.2) x 10(5) J m(-3). (C) 1998 Elsevier Science B.V. All rights reserved.

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收藏

页码：925 / 927

页数：3

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