The effect of trapping superparamagnetic beads on domain wall motion
The effect of trapping superparamagnetic beads on domain wall motion
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DOI：
10.1063/1.3428775
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发表时间：
2010-05-10
影响因子：
4
通讯作者：
Allwood, Dan A.
中科院分区：
文献类型：
--
作者：
Bryan, Matthew T.;Dean, Julian;Allwood, Dan A.
域壁可以作为局部场源来捕获和移动超顺磁珠以操纵生物细胞和DNA。使用微磁学和分析模型相结合的各种直径的珠子和壁之间的相互作用进行了研究。畴壁可以在施加的磁场下运输珠，但是珠和壁之间的相互吸引导致影响珠的拖曳力耦合到壁运动中。因此，与珠的相互作用导致畴壁动力学的根本变化，降低了五个数量级的壁流动性。(C)2010年美国物理学会。[doi 10.1063/1.3428775]
Domain walls may act as localized field sources to trap and move superparamagnetic beads for manipulating biological cells and DNA. The interaction between beads of various diameters and a wall is investigated using a combination of micromagnetic and analytical models. Domain walls can transport beads under applied magnetic fields but the mutual attraction between the bead and wall causes drag forces affecting the bead to couple into the wall motion. Therefore, the interaction with the bead causes a fundamental change in the domain wall dynamics, reducing the wall mobility by five orders of magnitude. (C) 2010 American Institute of Physics. [doi:10.1063/1.3428775]