Transport of magnetic microparticles via tunable stationary magnetic traps in patterned wires
Transport of magnetic microparticles via tunable stationary magnetic traps in patterned wires
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DOI：
10.1103/physrevb.85.174440
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发表时间：
2012-05-30
影响因子：
3.7
通讯作者：
Sooryakumar, R.
中科院分区：
文献类型：
--
作者：
Vieira, G.;Chen, A.;Sooryakumar, R.
远程操纵表面上的流体磁性粒子对于探测、组装和分类微米级和纳米级物体是有用的。在本文中，所产生的磁场从磁畴壁在锯齿形导线以及从磁化分布在缺口Co0.5Fe0.5线图案化的硅表面上示出作为有效的陷阱，这样的对象。弱（类似于100 Oe）的面内和面外外部磁场修改能量景观，允许捕获的物体沿着沿着预定路线在表面上远程地被捕获，同时在导线顶点和凹口处的磁化分布保持静止。在计算力时，通过使用微磁模拟对导线磁化进行建模或通过将陷阱近似为场的点源来确定净磁场及其空间分布。在实验条件下，这些模型的粒子操纵的适用性进行了讨论。
Remote manipulation of fluid-borne magnetic particles on a surface is useful to probe, assemble, and sort microscale and nanoscale objects. In this paper, fields emanating from magnetic domain walls in zigzag wires as well as from magnetization distributions in notched Co0.5Fe0.5 wires patterned on a silicon surface are shown to act as effective traps for such objects. Weak (similar to 100 Oe) in- and out-of-plane external magnetic fields modify the energy landscape, allowing for the entrapped objects to be remotely maneuvered along predetermined routes across the surface while the magnetization profiles at the wire vertices and notches remain stationary. In calculating the forces, the net magnetic field and its spatial distribution are determined by modeling the wire magnetization using micromagnetic simulation or by approximating the trap as a point source of fields. The applicability of these models to particle manipulation under the experimental conditions is discussed.