Enhanced magnetic field sensitivity of spin-dependent transport in cluster-assembled metallic nanostructures
Enhanced magnetic field sensitivity of spin-dependent transport in cluster-assembled metallic nanostructures
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DOI：
10.1038/nmat1713
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发表时间：
2006-08
期刊：
影响因子：
41.2
通讯作者：
S. Serrano-Guisan;G. di Domenicantonio;M. Abid;Jean-Pierre Abid;M. Hillenkamp;L. Gravier;J. Ansermet-J.-Anser
中科院分区：
文献类型：
--
作者：
S. Serrano-Guisan;G. di Domenicantonio;M. Abid;Jean-Pierre Abid;M. Hillenkamp;L. Gravier;J. Ansermet-J.-Anser
新兴的自旋电子学领域探索了利用电子自旋制造快速纳米电子器件的前景所提供的许多可能性。磁化作用于电流的效应是巨磁电阻或隧道磁电阻的本质。虽然这种自旋电子学效应已经在技术上得到应用，但许多潜在的物理学仍有待探索。这篇文章的目的是证明自旋混合在金属纳米结构中的重要性。在这里，我们表明，嵌入在金属基体中的磁性团簇表现出巨大的磁响应在低温下超过500%，使用最近开发的热电测量。这种方法消除了占主导地位的电阻率分量的磁响应，从而揭示了一个内在的自旋相关的过程：导电电子自旋进动的交换场作为电子穿过集群，产生一个自旋混合机制与强场的依赖性。这种效应只在最小的团簇中才明显，也就是说，在每个团簇少于100个原子的水平上。
The emerging field of spintronics explores the many possibilities offered by the prospect of using the spin of the electrons for fast, nanosized electronic devices. The effect of magnetization acting on a current is the essence of giant or tunnel magnetoresistance. Although such spintronics effects already find technological applications, much of the underlying physics remains to be explored. The aim of this article is to demonstrate the importance of spin mixing in metallic nanostructures. Here we show that magnetic clusters embedded in a metallic matrix exhibit a giant magnetic response of more than 500% at low temperature, using a recently developed thermoelectric measurement. This method eliminates the dominating resistivity component of the magnetic response and thus reveals an intrinsic spin-dependent process: the conduction-electron spin precession about the exchange field as the electron crosses the clusters, giving rise to a spin-mixing mechanism with strong field dependence. This effect appears sensibly only in the smallest clusters, that is, at the level of less than 100 atoms per cluster.