Magnetic properties of a triangle double-layer graphene nanoisland: a Monte Carlo study
School of Science, Shenyang University of Technology, Shenyang, 110870, China
2 School of Electrical Engineering, Shenyang University of Technology, Shenyang, 110870, China
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Accepted: 22 July 2020
Published online: 28 July 2020
By using Monte Carlo simulations, we investigated a triangle double-layer graphene nanoisland with mixed-spin (3/2, 2) configuration. We focused on the effects of crystal-fields, exchange couplings, longitudinal magnetic fields, and temperature on the magnetic properties of the system. Various curves of magnetization, susceptibility, and internal energy as a function of temperature were obtained. We plotted the phase diagrams of blocking temperature in the different parameter planes. We found that increasing |J ab /J Z |,J bb /J Z , and h/J Z or weakening |D b /J Z | is beneficial to improving the T B /J Z , but the T B /J Z is very insensitive to changes in the D a /J Z and J aa /J Z . In addition, it is worth noting that the system can exhibit abundant multiple-loops hysteresis behaviors for certain physical parameters, such as triple, quadruple, quintuple, septuple hysteresis loops.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2020