arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1909.00527cond-mat.mtrl-scicond-mat.mes-hall
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薄膜的磁致/增强粗化

Magnetically induced/enhanced coarsening in thin films

Rainer Backofen, Axel Voigt

摘要:

外部磁场影响多晶材料的微观结构。利用扩展的相场晶体模型研究了强外磁场对薄膜粗化过程中晶粒尺寸长时间标度的影响。此外,各种几何和拓扑性质的变化进行了研究。在导致停滞的情况下,所施加的外部磁场可诱发进一步的晶粒生长。由磁各向异性引起的感应驱动力定义了外部磁场的磁影响。不同的缩放制度被确定依赖于磁化。开始时,标度指数随着磁化强度的增加而增加。随后,当织构变得由优选地与外部磁场对准的晶粒主导时,标度指数变得与磁化强度无关或发生停滞。我们讨论了如何磁的影响改变的效果,减速或钉扎力,这是已知的影响标度指数。我们进一步研究了磁场对晶粒尺寸分布(GSD)、次近邻分布(NND)以及晶粒形状和取向的影响。如果可能的话,我们将我们的预测与实验结果进行比较。

英文摘要:

External magnetic fields influence the microstructure of polycrystalline materials. We explore the influence of strong external magnetic fields on the long time scaling of grain size during coarsening in thin films with an extended phase-field-crystal model. Additionally, the change of various geometrical and topological properties is studied. In a situation which leads to stagnation, an applied external magnetic field can induce further grain growth. The induced driving force due to the magnetic anisotropy defines the magnetic influence of the external magnetic field. Different scaling regimes are identified dependent on the magnetization. At the beginning, the scaling exponent increases with the strength of the magnetization. Later, when the texture becomes dominated by grains preferably aligned with the external magnetic field, the scaling exponent becomes independent of the strength of the magnetization or stagnation occurs. We discuss how the magnetic influence change the effect of retarding or pinning forces, which are known to influence the scaling exponent. We further study the influence of the magnetic field on the grain size distribution (GSD), next neighbor distribution (NND) as well as grain shape and orientation. If possible, we compare our predictions with experimental findings.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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