Magnetic anisotropy in spherical Fe16N2 core-shell nanoparticles determined by torque measurements

被引：7

作者：

Kita, Eiji ^{[1
,2
]}

Shibata, Kenichi ^{[1
]}

Sasaki, Yuji ^{[3
]}

Kishimoto, Mikio ^{[1
]}

Yanagihara, Hideto ^{[1
]}

机构：

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

[2] Ibaragi Coll, Natl Inst Technol, Hitachinaka, Ibaraki 3128508, Japan

[3] Hitachi Maxell Ltd, 1 Koizumi, Kyoto 6158525, Japan

来源：

AIP ADVANCES | 2017年 / 7卷 / 05期

关键词：

ROTATIONAL HYSTERESIS;

D O I：

10.1063/1.4974276

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The magnetic anisotropy energy for core-shell alpha"-Fe16N2 nanoparticles was evaluated by the rotational hysteresis loss obtained from magnetic torque measurements. The saturation magnetization of the alpha"-Fe16N2 core was deduced from volume fractions of alpha"-Fe16N2 determined by an analysis of a low-temperature Mossbauer spectrum. The saturation magnetization and the anisotropy energy were found to be 234 emu/cc and 6.9 Merg/cm(3), respectively. These values coincide with those of bulk-like single-phase alpha"-Fe16N2 particles. This crystalline anisotropy is still smaller than the shape anisotropy of the thin films (2 pi Ms-2 = 20 Merg/cm(3)), and a perpendicular magnetic state is not expected for the thin-film form. (C) 2017 Author(s).

引用

页数：5

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