Regulating Brownian fluctuations with tunable microscopic magnetic traps.
Regulating Brownian fluctuations with tunable microscopic magnetic traps.
复制标题
用可调微观磁陷阱调节布朗涨落。
DOI：
10.1103/physrevlett.107.087206
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发表时间：
2011
影响因子：
8.6
通讯作者：
Sooryakumar,R
中科院分区：
文献类型：
--
作者：
Chen,A;Vieira,G;Henighan,T;Howdyshell,M;North,JA;Hauser,AJ;Yang,FY;Poirier,MG;Jayaprakash,C;Sooryakumar,R
实现流体承载的亚微米尺寸物体的位置控制的主要挑战是调节它们的布朗波动。我们提出了一个基于磁场的陷阱，调节超顺磁珠悬浮液的热波动。局部畴壁场源自图案化的磁线，其强度和轮廓由弱外部场调谐，使得陷阱内的珠轨迹能够被管理并且容易地在强约束和离域空间偏移之间变化，所述离域空间偏移通过模拟被描述得非常好。
A major challenge to achieving positional control of fluid borne submicron sized objects is regulating their Brownian fluctuations. We present a magnetic-field-based trap that regulates the thermal fluctuations of superparamagnetic beads in suspension. Local domain-wall fields originating from patterned magnetic wires, whose strength and profile are tuned by weak external fields, enable the bead trajectories within the trap to be managed and easily varied between strong confinements and delocalized spatial excursions that are described remarkably well by simulations.