Reorientation Response of Magnetic Microspheres Attached to Gold Electrodes Under an Applied Magnetic Field
Reorientation Response of Magnetic Microspheres Attached to Gold Electrodes Under an Applied Magnetic Field
复制标题
附着在金电极上的磁性微球在外加磁场下的重新取向响应
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Y. Majima
中科院分区：
文献类型：
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作者：
L. Valladares;A. Domínguez;J. Aguiar;R. Reeve;T. Mitrelias;R. Langford;Y. Azuma;C. Barnes;Y. Majima
在这项工作中，我们报告的机械重取向的巯基铁磁微球桥接一对金电极下的外部磁场。在用辛烷二硫醇（C8 H18 S2）自组装膜（SAMs）固定于两个金电极上的羧基铁磁微球（直径4 μm）的电流-电压特性测量过程中，当外加磁场（7 kG）时，电流信号发生畸变。这种效应不是由于磁阻引起的，而是由铁磁球体的机械重新取向引起的，这会改变球体和电极之间的自组装膜的数量，从而影响导电。为了研究铁磁颗粒的物理重取向，我们测量了它们悬浮在液体溶液中的磁滞回线。
In this work, we report the mechanical reorientation of thiolated ferromagnetic microspheres bridging a pair of gold electrodes under an external magnetic field. When an external magnetic field (7 kG) is applied during the measurement of the current–voltage characteristics of a carboxyl ferromagnetic microsphere (4 μm diameter) attached to two gold electrodes by self-assembled monolayers (SAMs) of octane dithiol (C8H18S2), the current signal is distorted. Rather than due to magnetoresistance, this effect is caused by a mechanical reorientation of the ferromagnetic sphere, which alters the number of SAMs between the sphere and the electrodes and therefore affects conduction. To study the physical reorientation of the ferromagnetic particles, we measure their hysteresis loops while suspended in a liquid solution.