枝状畴的形成及分形维数计算

对于石榴石磁泡薄膜，提出了产生单个枝状畴（MBD)的“低静态偏磁场法”.MBD的形成是与其畴壁内垂直布洛赫线（VBL）的形核相联系的.随着静态偏磁场H_b从“枝状膨胀的临界偏磁场”Hd]的降低，相应的MBD的畴形变得越来越复杂，伴随有几类硬磁泡的相继形成.对MBD进行了分形研究，把线结构维数的计算应用于MBD极其弯曲的畴壁结构，定量地描述了它们的弯曲和分枝程度，并与其畴壁内VBL的形核联系起来. 关键词：

Formation of Multi-Branched Domains and the Calculation of Their Fractal Dimension

A “low-bias-field method” was proposed to form single multi-branched domains (MBDs) in garnet bubble films. The formation of MBDs is related to the nucleation of vertical Bloch lines (VBL) in their domain walls. With the decrease of the static bias-field H_b from the “critical static bias field for multi-branched expansion” Hd], the corresponding MBDs formed become more and more complex, accompanying the appearance of several kinds of hard domains. The fractal geometry was introduced into the study of MBDs. THe curved and branched patterns patterns of MBDs have been quantitatively described by the “line-measuring dimension” D_line, which is associated with the nucleation of VBL in their domain walls.