Exchange Anisotropy in NiO/Co Bilayers

• Authors: L. Smardz
• Languages of publication: EN

Abstracts

EN

40 nm-NiO/d_{Co}-Co bilayers (0< d_{Co} <40nm) were prepared onto SiO_{2}(101)/Si(100) and glass substrates using UHV RF/DC magnetron sputtering. Results showed that the exchange coupling effects, i.e. unidirectional anisotropy field, H_{s} (shift of the hysteresis loop), and broadening of the hysteresis loop, ΔH_{c}, are inversely proportional to the Co thickness down to 2nm. Furthermore, no significant difference in H_{s} and ΔH_{c} was observed between as deposited and field cooled bilayers. Practically no contraction of the successive hysteresis loops (training effects) was also observed at room temperature. On the other hand, the interface exchange coupling effects strongly depend on the preparation conditions. A maximal coupling energy for the NiO-Co interface was estimated as 0.04mJ/m^{2} at room temperature for the samples prepared onto SiO_{2}(101)/Si(100) substrates.

Keywords

EN

75.30.Et; 75.70.-i

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2000
• Volume: 98
• Issue: 5
• Pages: 605-610

Dates

published

2000-11

Contributors

author

L. Smardz

• Institute of Molecular Physics, Polish Academy of Sciences Smoluchowskiego 17, 60-179 Poznań, Poland