Mean-Field and Monte Carlo calculations of phase transitions in a core-shell Ising nanotube

被引：3
|
作者：
Karimou, M. [1 ,2 ]
Oke, T. D. [2 ]
Hontinfinde, S. I. V. [3 ]
Kple, J. [2 ,4 ]
Hontinfinde, F. [2 ,4 ]
机构：
[1] Univ Abomey, Ecole Natl Super Genie Energet & Procedes ENSGEP, Godomey, Benin
[2] Univ Abomey Calavi, Inst Math & Sci Phys, Godomey, Benin
[3] Univ Abomey, Ecole Natl Super Genie Math & Modelisat ENSGMM, Abomey, Benin
[4] Univ Abomey Calavi, Fac Sci & Tech, Abomey, Benin
来源：
PHYSICA B-CONDENSED MATTER | 2023年 / 666卷
关键词：
Ising nanotube; Mean-field theory; Monte Carlo method; Magnetic field; Phase transitions; Magnetic hysteresis; MAGNETIC-PROPERTIES; FABRICATION; DIAGRAMS; NANOWIRE; COMPENSATION; REVERSAL; BILAYER; SURFACE;
D O I：
10.1016/j.physb.2023.415107
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
A cylindrical Ising nanotube that consists of 3/2 core spins surrounded by 5/2 shell spins is introduced and studied with Mean-Field approximation and Monte Carlo simulations in the presence of crystal and external magnetic fields. The effects of positive and negative interfacial coupling constants on the magnetic properties have been examined. The thermal behaviors of the order parameters and different types of macroscopic instabilities are presented. The model exhibits compensation points, first-and second-order phase transitions. Richer magnetic properties are obtained in the antiferromagnetic core-shell coupling case. In the presence of ferromagnetic interfacial coupling, the simulations sometimes generated long-lived metastable states. These states jumped to stable thermodynamic ones under thermal fluctuations via first-order phase transitions.
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页数：10
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