Mean-field study of magnetic properties and hysteresis behavior in a bilayer graphene Ising system

Using the mean-field approximation based on the Gibbs-Bogoliubov inequality for the free energy, we conducted an investigation into the magnetic properties and hysteresis behavior of a graphene Ising bilayer, where the top and bottom layers are occupied by spins σ = 3/2 and S = 5/2, respectively. Th...

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Bibliographic Details
Published in:Physica scripta 2024-05, Vol.99 (5), p.55917
Main Authors: Salama, M, Mouhrach, T, Choubabi, E B, Hachem, N, El Bouziani, M
Format: Article
Language:English
Subjects:
blocking temperature
graphene bilayer
hysteresis loops
magnetic susceptibility
magnetization
mean-field
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Summary:Using the mean-field approximation based on the Gibbs-Bogoliubov inequality for the free energy, we conducted an investigation into the magnetic properties and hysteresis behavior of a graphene Ising bilayer, where the top and bottom layers are occupied by spins σ = 3/2 and S = 5/2, respectively. The effects of exchange interactions, crystal fields, external magnetic field and temperature on the total magnetization, partial magnetizations of each layer, total magnetic susceptibility, blocking temperature and hysteresis loops of the system were thoroughly analyzed. The variations of the blocking temperature as a function of various parameters in the system’s Hamiltonian were presented. Furthermore, we demonstrated the existence of multiple hysteresis loop behaviors under specific physical conditions.
ISSN:0031-8949
1402-4896
DOI:10.1088/1402-4896/ad3683