Magnetic properties of core-shell type Fe16N2 nanoparticles

被引：49

作者：

Kita, Eiji ^{[1
]}

Shibata, K.

Yanagihara, H.

Sasaki, Y.

Kishimoto, M.

机构：

[1] Univ Tsukuba, Inst Appl Phys, Tsukuba, Ibaraki 3058573, Japan

[2] Hitachi Maxell Ltd, Kyoto 6158525, Japan

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2007年 / 310卷 / 02期

关键词：

Fe16N2; nanoparticle; coercivity; magnetic anisotropy; core-shell structure;

D O I：

10.1016/j.jmmm.2006.10.1009

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Fe16N2 nanoparticles with a diameter of 20 nm were produced with ammonia nitrification of metallic Fe particles reduced from Fe oxide nanoparticles. The samples were gradually exposed to air and the outer side of 2 nm was oxidized. The particles exhibit coercivity as high as 3350 Oe. By using this core-shell type round shaped particles, uniaxial magnetic anisotropy K-u can be determined to be 4: 4 x 10(6) erg/cm(3) under no influence of large shape anisotropy originated from a thin film form. Exchange bias due to the interface between inner ferromagnetic Fe16N2 core and outer Fe oxides was found below 25 K. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：2411 / 2413

页数：3

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