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

Authors :
Eiji Kita
Kenichi Shibata
Yuji Sasaki
Mikio Kishimoto
Hideto Yanagihara
Source :
AIP Advances, Vol 7, Iss 5, Pp 056212-056212-5 (2017)
Publication Year :
2017
Publisher :
AIP Publishing LLC, 2017.

Abstract

The magnetic anisotropy energy for core–shell α”-Fe16N2 nanoparticles was evaluated by the rotational hysteresis loss obtained from magnetic torque measurements. The saturation magnetization of the α”-Fe16N2 core was deduced from volume fractions of α”-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/cm3, respectively. These values coincide with those of bulk-like single-phase α”-Fe16N2 particles. This crystalline anisotropy is still smaller than the shape anisotropy of the thin films (2πMs2=20 Merg/cm3), and a perpendicular magnetic state is not expected for the thin-film form.

Subjects

Subjects :
Physics
QC1-999

Details

Language :
English
ISSN :
21583226
Volume :
7
Issue :
5
Database :
Directory of Open Access Journals
Journal :
AIP Advances
Publication Type :
Academic Journal
Accession number :
edsdoj.2e2508d9cae4405b51c8fd1290943ff
Document Type :
article
Full Text :
https://doi.org/10.1063/1.4974276