基于Ising模型的有限尺寸无序磁系统磁场的衰减  

Attenuation of magnetic field in finite size disordered system based on Ising model

作　　者：张竞博 ZHANG Jing-bo(Department of Modern Mechanics,University of Science and Technology of China,Hefei 230027,China;IAT-Chungu Joint Laboratory for Additive Manufacturing,University of Science and Technology of China,Hefei 230088,China)

机构地区：[1]中国科学技术大学近代力学系,安徽合肥230027 [2]中国科学技术大学,先进技术研究院,安徽春谷增材制造联合实验室,安徽合肥230088

出　　处：《磁性材料及器件》2022年第6期1-6,共6页Journal of Magnetic Materials and Devices

摘　　要：探讨了无序磁系统的磁场衰减以及衰减的机理。通过评估有限尺寸无序磁系统外部的磁通密度概率分布的方法分别探究了一维和二维无序系统的磁场衰减的现象。结果表明,一维无序磁系统产生的磁场衰减存在三个阶段:单个磁矩磁通密度、方差趋近于0的高斯分布和双指数衰减分布。二维的结果与一维结果类似,但是衰减更慢。二维Ising模型的Mento Carlo模拟结果表明,磁矩无序度的增加导致磁通密度衰减更快,屏蔽效果更明显。理论证明了无序效应能屏蔽磁场,为无序磁系统磁性的研究提供了新的方法。The magnetic field attenuation of disordered magnetic system and its mechanism are discussed.By evaluating the probability distribution of flux density outside the disordered magnetic system,the phenomenon of magnetic field attenuation in 1D and 2D disordered magnetic system is investigated.The results show that there are three stages of magnetic field attenuation in 1D disordered magnetic system:single magnetic flux density,Gaussian distribution with variance approaching 0 and double exponential attenuation distribution.The results of two-dimensional system are similar to that of one-dimensional system,but the results of one-dimensional system decays much more steeply.The results of 2D Ising model Monte Carlo simulation show that the increase of magnetic moment disorder results in faster attenuation of magnetic flux density and more obvious shielding effect.It is proved that the disorder effect can shield the magnetic field,which provides a new method to study the magnetism of the disorder magnetic system.

关 键 词：无序磁矩 磁场屏蔽 ISING模型 Mento Carlo模拟 

分 类 号：TM153[电气工程—电工理论与新技术]