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Multilayer Transitions in Mixed Spin-3/2 and~1/2 Blume-Capel Model with RKKY Interaction

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El Hallani F., Ez-Zahraouy H., Benyoussef A., Bahmad L.

Acta Physica Polonica A

2011

vol. 120

issue 3

485-490

We studied the effect of the Ruderman-Kittel-Kasuya-Yosida interaction on the multilayer transition and magnetic properties of spins-3/2 and 1/2 Blume-Capel model in the bilayer separated by a non-magnetic spacer of thickness (d), by using mean-field theory and Monte Carlo simulation. It is found that the multilayer transition temperature depends strongly on the thickness of the non-magnetic layer and the crystal field. Furthermore, the critical thickness of the non-magnetic spacer above which the two magnetic multilayers transit separately depends on the Fermi level and the absolute temperature.

The Effect of a Random Crystal-Field on the Mixed Ising Spins (1/2, 3/2)

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Bahmad L., Benayad M., Benyoussef A., El Kenz A.

Acta Physica Polonica A

2011

vol. 119

issue 6

740-746

We study the magnetic properties of a mixed Ising ferrimagnetic system, in which the two interacting sublattices have spins σ,(±1/2) and spins S,(±3/2,±1/2) in the presence of a random crystal field, with the mean field approach. The results obtained, using mean field approach and Monte Carlo simulation, show the appearance of a new ferrimagnetic phase, namely the partly ferrimagnetic phase (m_{σ} = -1/2 , m_{S} = +1). Consequently, three topologically different types of phase diagrams have been given by mean field approach. The effect of increasing the exchange interaction parameter J, at very low temperature is also investigated.

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2 Acta Physica Polonica A

2 2011

2 Bahmad L.

2 Benyoussef A.

1 Benayad M.

1 El Hallani F.

1 El Kenz A.

1 Ez-Zahraouy H.

Search results

Multilayer Transitions in Mixed Spin-3/2 and~1/2 Blume-Capel Model with RKKY Interaction

The Effect of a Random Crystal-Field on the Mixed Ising Spins (1/2, 3/2)