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Growth-induced perpendicular anisotropy of grains in Co-Al-O nanogranular ferromagnetic films

  • Magnetism
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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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Authors and Affiliations

  1. Institute of Physics, National Academy of Sciences of Ukraine, pr. Nauki 46, Kiev, 03028, Ukraine

    A. A. Timopheev, S. M. Ryabchenko, V. M. Kalita, A. F. Lozenko & P. A. Trotsenko

  2. Voronezh State Technical University, Moskovskii pr. 14, Voronezh, 394026, Russia

    O. V. Stognei & A. V. Sitnikov

Authors
  1. A. A. Timopheev
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  2. S. M. Ryabchenko
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  3. V. M. Kalita
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  4. A. F. Lozenko
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  5. P. A. Trotsenko
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  6. O. V. Stognei
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  7. A. V. Sitnikov
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Correspondence to A. A. Timopheev.

Additional information

Original Russian Text © A.A. Timopheev, S.M. Ryabchenko, V.M. Kalita, A.F. Lozenko, P.A. Trotsenko, O.V. Stognei, A.V. Sitnikov, 2011, published in Fizika Tverdogo Tela, 2011, Vol. 53, No. 3, pp. 463–471.

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Timopheev, A.A., Ryabchenko, S.M., Kalita, V.M. et al. Growth-induced perpendicular anisotropy of grains in Co-Al-O nanogranular ferromagnetic films. Phys. Solid State 53, 494–503 (2011). https://doi.org/10.1134/S1063783411030309

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  • DOI: https://doi.org/10.1134/S1063783411030309

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