Continuum of compensation points in the mixed spin Ising ferrimagnet with four-spin interaction and next-nearest neighbor coupling |
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Authors: | M. Azhari M. Mouhib |
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Affiliation: | Laboratory of High Energy Physics and Condensed Matter, Faculty of Sciences, Hassan II University – Casablanca, A?n Chock, Casablanca, Morocco |
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Abstract: | We investigate the magnetic properties of the mixed spin-1/2 and spin-1 Ising ferrimagnetic system with four-spin interaction J4 and next-nearest neighbor (NNN) coupling J′. We perform exact ground-state calculations and use the finite cluster approximation, based on a single cluster theory, to derive the state equations for the two-dimensional square lattice. The main attention has been paid to the study of the phase diagram for both the transition and compensation temperatures. We find a number of characteristic behaviors. The model with only NNNs induces one compensation point while the four-spin interaction does not. The investigation of the model with both interactions shows a number of characteristic behaviors. In particular, the presence of the four-spin interaction, according to J4 and J′, may lead to one, two or possibly a continuum of compensation points. This phenomenon may have important applications in technology such as thermomagnetic writing and erasing at the compensation point. |
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Keywords: | Mixed spin Ising ferrimagnet four-spin interaction next-nearest neighbor coupling phase diagram continuum of compensation temperatures |
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