Polaron spin current transport in organic semiconductors
Polaron spin current transport in organic semiconductors
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DOI：
10.1038/nphys2901
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发表时间：
2014-03
期刊：
影响因子：
19.6
通讯作者：
S. Watanabe;K. Ando;K. Kang;S. Mooser;Y. Vaynzof;H. Kurebayashi;E. Saitoh;H. Sirringhaus
中科院分区：
文献类型：
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作者：
S. Watanabe;K. Ando;K. Kang;S. Mooser;Y. Vaynzof;H. Kurebayashi;E. Saitoh;H. Sirringhaus
在自旋电子学中，纯自旋流在信息的传输、处理和存储中起着关键作用。纯自旋电流是电子自旋角动量的流动，而不是电荷电流的同时流动。它可以由传导电子或磁子携带，已经在许多无机金属、半导体和绝缘体中进行了研究，但还没有在有机半导体中进行研究。π共轭有机材料中的电荷载流子是局域自旋1/2极化子，它们通过跳跃运动，但其自旋输运和驰豫机制尚不清楚。在这里，我们使用铁磁/共轭聚合物/非磁性自旋吸收三层膜中的铁磁共振自旋泵浦来证明极化子能够携带数百纳米的纯自旋流，自旋弛豫时间长达一毫秒，并表现出Hanle进动。通过系统地比较同一三层膜的电荷输运和自旋输运，我们发现在室温下，自旋-轨道耦合起到了自旋弛豫的调节作用。
In spintronics, pure spin currents play a key role in transmitting, processing and storing information. A pure spin current is a flow of electron spin angular momentum without a simultaneous flow of charge current. It can be carried by conduction electrons or magnons and has been studied in many inorganic metals, semiconductors and insulators, but not yet in organic semiconductors. Charge carriers inπ-conjugated organic materials are localized spin-1/2 polarons which move by hopping, but the mechanisms of their spin transport and relaxation are not well understood. Here we use ferromagnetic resonance spin pumping in a ferromagnet/conjugated polymer/nonmagnetic spin-sink trilayer to demonstrate the ability of polarons to carry pure spin currents over hundreds of nanometres with long spin relaxation times of up to a millisecond and to exhibit Hanle precession. By systematically comparing charge and spin transport on the same trilayer we show that spin-orbit coupling mediates spin relaxation at room temperature.