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

Journal Article · Tue Apr 01 00:00:00 EDT 2008 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.2837502· OSTI ID:21137304

Lin, K -W; Guo, J -Y; Liu, H -Y; Ouyang, H ^[1]; Chan, Y -L; Wei, D -H ^[2]; Lierop, J van ^[3]

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1. Department of Materials Science and Engineering, National Chung Hsing University, Taichung 402, Taiwan (China)
2. National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan (China)
3. Department of Physics and Astronomy, University of Manitoba, Winnipeg R3T2N2 (Canada)

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 O{sub 2}/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%O{sub 2}/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.

• OSTI ID: 21137304
• Journal Information: Journal of Applied Physics, Vol. 103, Issue 7; Conference: 52. annual conference on magnetism and magnetic materials, Tampa, FL (United States), 5-9 Nov 2007; Other Information: DOI: 10.1063/1.2837502; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIFERROMAGNETIC MATERIALS
COBALT ALLOYS
COBALT OXIDES
DEPOSITION
EXCHANGE INTERACTIONS
FCC LATTICES
FERROMAGNETIC MATERIALS
HYSTERESIS
ION IMPLANTATION
LAYERS
MAGNETIC PROPERTIES
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL OXIDES
X-RAY DIFFRACTION