Investigation of magnetic field effect on surface and finite-site free energy in one-dimensional Ising model of nanosystems |
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Authors: | Farid Taherkhani Hadi Abroshan Hamed Akbarzadeh Alessandro Fortunelli |
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Affiliation: | 1. Department of Chemistry , Sharif University of Technology , Tehran, Iran faridtaherkhani@gmail.com;3. Department of Chemistry , Sharif University of Technology , Tehran, Iran;4. Istituto per i Processi Chimico-Fisici (IPCF) del CNR , Via Giuseppe Moruzzi 1, I-56124, Pisa, Italy |
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Abstract: | We investigate a one-dimensional (1-D) Ising model for finite-site systems. The finite-site free energy and the surface free energy are calculated via the transfer matrix method. We show that, at high magnetic fields, the surface free energy has an asymptotic limit. The absolute surface energy increases when the value of f (the ratio of magnetic field to nearest-neighbor interactions) increases, and for f?≥?10 approaches a constant value. For the values of f?≥?0.2, the finite-site free energy also increases, but slowly. The thermodynamic limit in which physical properties approach the bulk value is also explored. |
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Keywords: | magnetic materials nanostructures surface free energy finite-size free energy |
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