From Magnetic Nanoparticles to Magnetoresistive Biosensors
From Magnetic Nanoparticles to Magnetoresistive Biosensors
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DOI：
10.12693/aphyspola.121.420
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发表时间：
2012-02-01
影响因子：
0.7
通讯作者：
Huetten, A.
中科院分区：
文献类型：
--
作者：
Ennen, I.;Albon, C.;Huetten, A.
本文综述了磁性钴纳米粒子的合成及其磁输运性质的最新研究进展。结果表明，磁性Co纳米粒子自组装在纳米颗粒单分子膜中，表现出类似于颗粒体系的巨磁电阻，但由于纳米粒子小区域之间的偶极相互作用而具有额外的特征。用带有一个磁性Co纳米颗粒电极的自旋阀作为模型，证明了Co纳米颗粒的单个磁矩可以耦合到磁性Co层，而磁性Co层又提供了所产生的巨磁电阻特性的定制。此外，将磁性开关棘轮与集成在棘轮中的磁性隧道结相结合，引入了一种新的生物传感器概念：(1)同时传输和分离生物分子；(2)以一维排列方式通过磁性隧道结时，动态检测生物分子。据预测，这种生物传感器的概念不仅适用于细菌，也适用于病毒。
This paper highlights recent advances in synthesis and magnetotransport properties of magnetic Co nanopartides. It is shown that magnetic Co nanoparticles self-assembled in nanoparticular monolayers revealing giant magnetoresistance similar to granular systems but with additional features resulting from dipolar interactions between small domains of nanoparticles. A spin-valve with one magnetic Co nanoparticular electrode is employed as a model to demonstrate that individual magnetic moments of Co nanoparticles can be coupled to a magnetic Co layer which in turn offers tailoring of the resulting giant magnetoresistance characteristics. In addition, it is demonstrated that combining a magnetic on-off ratchet with magnetic tunneling junctions integrated in the ratchet introduces a new biosensor concept enabling: (1) simultaneous transporting and separating biomolecules, (2) dynamical biomolecule detection when passing magnetic tunneling junctions in a 1D arrangement. It is projected that this biosensor concept could be applied for viruses as well as for bacteria.