Universität Hamburg, Institut für Angewandte Physik, Jungiusstrasse 11, D-20355 Hamburg, Germany.
Phys Rev Lett. 2009 Oct 2;103(14):147204. doi: 10.1103/PhysRevLett.103.147204. Epub 2009 Oct 1.
We have studied the magnetic domain structure in Permalloy rectangles that reveal flux-closure domain configurations. Arrays with varying spacing between the rectangles are investigated by scanning electron microscopy with polarization analysis as well as by micromagnetic simulation. In contrast to general expectation, rectangles in the flux-closure Landau state show significant coupling and form a magnetic pattern of common chirality. The coupling is due to the stray field that originates from small changes of the magnetization alignment, which is sensitive to the exact shape and the separation of the rectangles.
我们研究了在坡莫合金矩形中揭示出的磁通封闭畴结构。通过扫描电子显微镜和极化分析以及微磁模拟研究了具有不同矩形间距的阵列。与普遍预期相反，处于磁通封闭朗道状态的矩形表现出显著的耦合，并形成具有共同手性的磁图案。这种耦合是由于源自磁化方向微小变化的杂散场引起的，而这种变化对矩形的精确形状和分离非常敏感。
