The molecular phase theory approximation is used to calculate the phase diagrams of a hexagonal cylindrical magnetic superlattice nanotube, with alternating atomic layers consisting of two distinct materials. Cases in which these materials are both ferromagnetic and antiferromagnetic are considered. The transition temperature Tc for the system under investigation is calculated by the transfer-matrix method, as a function of the intra- and interlayer exchange constants. The results for various ferromagnetic superlattice nanotubes consisting of different numbers of layers in a magnetic unit cell are presented, to establish the effect that surface and intralayer exchange constants have on the phase transition temperature.

中文翻译：

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磁性超晶格伊辛纳米管中的相变：分子场理论近似

分子相理论近似用于计算六角圆柱形磁性超晶格纳米管的相图，具有由两种不同材料组成的交替原子层。考虑了这些材料既具有铁磁性又具有反铁磁性的情况。所研究系统的转变温度 Tc 是通过传递矩阵方法计算的，作为层内和层间交换常数的函数。介绍了由磁性晶胞中不同层数组成的各种铁磁超晶格纳米管的结果，以确定表面和层内交换常数对相变温度的影响。