通过畴壁管道在芯片上操纵磁性纳米粒子
On-chip manipulation of magnetic nanoparticles through domain walls conduits
摘要：
纳米级磁条中的几何约束磁畴壁（DW）的操纵最近引起了人们的极大兴趣，并提出了用于预期存储器和逻辑器件的建议。在这里，我们建议使用高可控性的几何约束DW的运动，用于在芯片上的单个纳米粒子的操作与主动控制的位置在纳米尺度。所提出的方法利用了这样一个事实，即溶液中的磁性纳米颗粒可以被DW捕获，DW的位置可以在专门设计的磁性纳米线结构中以纳米精度进行操纵。我们表明，在这种结构中的DW成核，位移和湮灭过程的高度控制，可用于捕获，运输和释放磁性纳米粒子。由于具有功能化表面的磁性颗粒通常用作分子载体或标记物，因此对单个磁性纳米颗粒的处理的精确控制对于包括单分子操纵、分离、细胞操纵和生物磁性传感的若干应用至关重要。
英文摘要：
The manipulation of geometrically constrained magnetic domain walls (DWs) in nanoscale magnetic strips has attracted much interest recently, with proposals for prospective memory and logic devices. Here we propose to use the high controllability of the motion of geometrically constrained DWs for the manipulation of individual nanoparticles on a chip with an active control of position at the nanometer scale. The proposed method exploits the fact that magnetic nanoparticles in solution can be captured by a DW, whose position can be manipulated with nanometric accuracy in a specifically designed magnetic nanowire structure. We show that the high control over DW nucleation, displacement, and annihilation processes in such structures can be used to capture, transport and release magnetic nanoparticles. As magnetic particles with functionalized surfaces are commonly used as molecule carriers or labels, the accurate control over the handling of the single magnetic nanoparticle is crucial for several applications including single molecule manipulation, separation, cells manipulation and biomagnetic sensing.
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