Growth-induced perpendicular anisotropy of grains in Co-Al-O nanogranular ferromagnetic films |
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Authors: | A A Timopheev S M Ryabchenko V M Kalita A F Lozenko P A Trotsenko O V Stognei A V Sitnikov |
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Institution: | 1.Institute of Physics,National Academy of Sciences of Ukraine,Kiev,Ukraine;2.Voronezh State Technical University,Voronezh,Russia |
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Abstract: | This paper reports on the results of the magnetostatic measurements for Co-Al-O nanogranular films over a wide range of concentrations
of the ferromagnetic component x. It has been revealed that grains in the films are characterized by the growth-induced anisotropy with easy axes directed
perpendicular to the film plane. The maximum field of the single-grain perpendicular anisotropy reaches ∼2.5 kOe for samples
in the vicinity of the percolation threshold (x ≈ 61 at % Co). It has been established that the characteristic features of the superparamagnetic behavior of an ensemble
of oriented Stoner-Wohlfarth particles are retained for the sample with x ≈ 61 at % Co in the presence of the demagnetization field associated with the net magnetization of the film. The influence
of the demagnetization field of the film on the shape of the magnetization reversal curves, the coercivity, and the blocking
temperature has been investigated and simulated. The results of the simulation are consistent with the experimental data. |
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