High coercivity in large exchange-bias Co/CoO-MgO nano-granular films

We present a detailed study on the magnetic coercivity of Co/CoO-MgO core-shell systems, which exhibits a large exchange bias due to an increase of the uncompensated spin density at the interface between the CoO shell and the metallic Co core by replacing Co by Mg within the CoO shell. We find a lar...

Full description

Saved in:
Bibliographic Details
Published in:Chinese physics B 2015-03, Vol.24 (3), p.218-223
Main Author: 葛传楠 万贤纲 Eric Pellegrin 胡志伟 Wen-I Liang Michael Bruns 邹文琴 都有为
Format: Article
Language:English
Subjects:
Cobalt
Coercive force
Coercivity
CoO
Density
Exchange
Magnetic properties
Nanostructure
Percolation
Thresholds
交换偏置
渗透阈值
矫顽磁力
磁矫顽力
纳米颗粒膜
自旋密度
高矫顽力
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We present a detailed study on the magnetic coercivity of Co/CoO-MgO core-shell systems, which exhibits a large exchange bias due to an increase of the uncompensated spin density at the interface between the CoO shell and the metallic Co core by replacing Co by Mg within the CoO shell. We find a large magnetic coercivity of 7120 Oe around the electrical percolation threshold of the Co/CoO core/shell particles, while samples with a smaller or larger Co metal volume fraction show a considerably smaller coercivity. Thus, this study may lead to a route to improving the magnetic properties of artificial magnetic material in view of potential applications.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/24/3/034501