Belim Sergey V, Tikhomirov Ilya V
Physics Department, Omsk State Technical University, Omsk, 644050, Russia.
Sci Rep. 2021 Nov 2;11(1):21428. doi: 10.1038/s41598-021-00849-8.
In the article, computer simulation on the behavior of a ferromagnetic thin film on a non-magnetic substrate by computer simulation is performed. The substrate is described by the two-dimensional Frenkel-Kontorova potential. The Ising model is used to describe the magnetic properties of a two-dimensional ferromagnetic film. The Wolf cluster algorithm is used to model the magnetic behavior of the film. A square lattice is considered for an unperturbed ferromagnetic film. Computer simulations show that mismatch of film and substrate periods results in film splitting into regions with different atomic structures. Magnetic properties for the obtained structure have been investigated. The hysteresis loop is calculated using the Metropolis algorithm. Deformations of the substrate lead to a decrease in the phase transition temperature. The Curie temperature decreases both when the substrate is compressed and when stretched. The change in phase transition temperature depends on the decreasing rate of exchange interaction with distance and the amplitude of interaction with the substrate. When the substrate is compressed, an increase in the amplitude of the interaction between the film and the substrate results in an increase in the phase transition temperature. The opposite effect occurs when the substrate is stretched. The hysteresis loop changes its shape and parameters when the substrate is deformed. Compression and stretching of the substrate results in a decrease in coercive force. The reduction in coercive force when compressing the substrate is greater than when stretching. The magnetization of the film is reduced by deformations at a fixed temperature.
在本文中，通过计算机模拟对非磁性衬底上铁磁薄膜的行为进行了计算机模拟。衬底由二维弗伦克尔 - 康托洛娃势描述。伊辛模型用于描述二维铁磁薄膜的磁性。沃尔夫团簇算法用于模拟薄膜的磁行为。对于未受扰动的铁磁薄膜考虑采用正方形晶格。计算机模拟表明，薄膜和衬底周期的失配会导致薄膜分裂成具有不同原子结构的区域。已对所得结构的磁性进行了研究。使用 metropolis 算法计算磁滞回线。衬底的变形导致相变温度降低。当衬底被压缩和拉伸时，居里温度都会降低。相变温度的变化取决于交换相互作用随距离的降低速率以及与衬底相互作用的幅度。当衬底被压缩时，薄膜与衬底之间相互作用幅度的增加会导致相变温度升高。当衬底被拉伸时会出现相反的效果。当衬底变形时，磁滞回线会改变其形状和参数。衬底的压缩和拉伸会导致矫顽力降低。压缩衬底时矫顽力的降低大于拉伸时。在固定温度下，薄膜的磁化强度会因变形而降低。
