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Anomalous exchange bias behavior in ion-beam bombarded NiCo∕(Ni,Co)O bilayers

Authors :
Hao Ouyang
J. van Lierop
H.-Y. Liu
Ko-Wei Lin
Y.-L. Chan
J.-Y. Guo
Der-Hsin Wei
Source :
Journal of Applied Physics. 103:07C105
Publication Year :
2008
Publisher :
AIP Publishing, 2008.

Abstract

The structural and magnetic properties of NiCo∕(Ni,Co)O bilayers were investigated. X-ray diffractometry results have shown that the top NiCo layer consisted of a fcc NiCo phase. The bilayer bottom was either a pure (Ni,Co)O or a composite [NiCo+(Ni,Co)O] phase, depending on the percent of O2∕Ar ratio used during deposition. A double-shifted hysteresis loop exhibiting components that were from positive or negative coupling was observed in the NiCo∕(Ni,Co)O (8%O2∕Ar) bilayers. The microstructural changes, which result from a combination of deposition oxygen content and the ion-beam bombardment, will result in the unusual exchange bias behavior.

Details

ISSN :
10897550 and 00218979
Volume :
103
Database :
OpenAIRE
Journal :
Journal of Applied Physics
Accession number :
edsair.doi...........0e55127737d30b040787a4ec6564559d
Full Text :
https://doi.org/10.1063/1.2837502