Mean Field Study of a Cylindrical Ferrimagnetic Nanotube with Different Anisotropies

IF 0.8 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Nano Research Pub Date : 2023-12-22 DOI:10.4028/p-hst2ye

Y. Al Qahoom, K. El Kihel, R. Aharrouch, Abdalhameed Al-Rajhi, Mohamed Madani, M. El Bouziani

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Abstract

In this paper, the ferrimagnetic mixed spins (1, 5/2) Blume-Capel model is proposed to investigate the phase diagrams and hysteresis behaviors of a magnetic cylindrical nanotube with a core-shell structure using the mean-field approximation based on the Bogoliubov inequality for the Gibbs free energy. The core sites are occupied by σ= ±1, 0 spins, whereas the shell sites are filled by S= ±5/2, ±3/2, ±1/2 spins. The effects of exchange couplings (Jin, JS) and single-ion anisotropies (DC, DS) on core, shell, and total magnetizations are investigated, as well as hysteresis behaviors. The entropy, free energy, and specific heat are analyzed to establish the stability of the solutions. The presentation and discussion of phase diagrams is detailed. The system shows a first-order and second-order phase transitions, as well as tricritical and critical end- points. In addition, the system shows compensation and reentrant behaviors. Various multiple hysteresis loop behaviors are seen according on the Hamiltonian parameters, such as the presence of triple, quintuple, and septuple hysteresis loops.

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具有不同各向异性的圆柱形铁磁纳米管的平均场研究

本文提出了铁磁性混合自旋（1，5/2）布卢姆-卡佩尔模型，利用基于吉布斯自由能的波哥留波夫不等式的均场近似，研究了具有核壳结构的磁性圆柱纳米管的相图和磁滞行为。管芯位点由 σ= ±1、0 自旋占据，而管壳位点由 S= ±5/2、±3/2、±1/2 自旋填充。研究了交换耦合（Jin、JS）和单离子各向异性（DC、DS）对磁芯、磁壳和总磁化的影响，以及磁滞行为。通过分析熵、自由能和比热来确定溶液的稳定性。详细介绍并讨论了相图。系统显示了一阶和二阶相变，以及三临界点和临界终点。此外，系统还表现出补偿和重入行为。根据哈密顿参数的不同，出现了各种多重滞后环行为，如三重、五重和七重滞后环。

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来源期刊

Journal of Nano Research 工程技术-材料科学：综合

CiteScore

2.40

自引率

5.90%

发文量

审稿时长

4 months

期刊介绍： "Journal of Nano Research" (JNanoR) is a multidisciplinary journal, which publishes high quality scientific and engineering papers on all aspects of research in the area of nanoscience and nanotechnologies and wide practical application of achieved results. "Journal of Nano Research" is one of the largest periodicals in the field of nanoscience and nanotechnologies. All papers are peer-reviewed and edited. Authors retain the right to publish an extended and significantly updated version in another periodical.