Electrochemical Growth of Iron Arborescences under In-Plane Magnetic Field: Morphology Symmetry Breaking
Electrochemical Growth of Iron Arborescences under In-Plane Magnetic Field: Morphology Symmetry Breaking
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DOI：
10.1103/physrevlett.83.2612
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发表时间：
1999-09
影响因子：
8.6
通讯作者：
S. Bodea;L. Vignon;R. Ballou;P. Molho
中科院分区：
文献类型：
--
作者：
S. Bodea;L. Vignon;R. Ballou;P. Molho
在圆形几何结构中，研究了在生长平面上施加磁场的情况下，从Fe（SO4）水溶液的薄层中电化学沉积铁的图案形成。得到了树枝状聚集体，其宏观形貌从零场的圆形变为有限场中的矩形，矩形的一条边平行于场。这种场致对称性破缺被解释为是微观尺度上分支相对于场的取向选择的结果，与生长分支的磁偶极能量的最小化相关。
Pattern formation in the electrochemical deposition of iron from a thin layer of Fe(SO4) aqueous solution was investigated in a circular geometry under a magnetic field applied in the plane of growth. Arborescent aggregates were obtained whose macroscopic morphology changes from circular in zero field to rectangular in finite field, one edge of the rectangle being parallel to the field. This field-induced symmetry breaking is explained as resulting from a selection at the microscopic scale of the orientation of the branches with respect to the field, associated with a minimization of the magnetic dipolar energy of the growing branches.