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Magnetic domains studies in strongly and weakly exchange coupled Co/NiO bilayers

Smardz L., Niedoba H., Smardz K.

Materials Science Poland

2007

Vol. 25, No. 2

441--446

Results of the Auger electron spectroscopy measurements with depth profiling showed that at the Co-NiO interface only oxygen is present, making it very likely that only NiO is formed and no other nickel or cobalt compounds, which grow apparently with smaller probability. It has been also found that the average exchange coupling energy for the Co-NiO interface strongly depends on the preparation conditions. For the Co layers with strong interface exchange coupling, we have observed large uniform domains and 180° walls. On the other hand, the Co layers with the weak interface coupling showed large domains with a strong ripple structure and non-uniform 180° walls.

Rotational anisotropy in exchange-biased NiFe/FeMn bilayers

Hwang D. G.

Materials Science

2003

Vol. 21, No. 1

39-45

The anisotropic magnetoresistance (AMR) model was improved in order to determinate the magnitude and direction of the rotational anisotropy in NiFe/FeMn bilayer structures having different thicknesses of the ferromagnetic and antiferromagnetic layers. There are in our model two important parameters, namely the ratios ? = Hrot/Hex and ß=?rot/?a, where Hrot, and are the effective magnetic field and the angle of the rotational anisotropy, and Hex and ?a are the exchange bias field and the angle of applied field. These parameters describe the magnitude and direction of the rotational anisotropy. As the thickness of FeMn layer decreased up to 3.5 nm, the value increased from about 0.15 to 0.55. This proves that the regions of a weak exchange coupling extended as the antiferromagnetic layer thickness decreases. The ? and ß almost did not change as the NiFe layer thickness increased from 7 nm up to 15 nm, even the Hex was then reduced from 170 Oe to 70 Oe.