Sign reversal of magnetoresistance and inverse spin Hall effect in doped conducting polymers
Sign reversal of magnetoresistance and inverse spin Hall effect in doped conducting polymers
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DOI：
10.1088/1361-648x/aae86f
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发表时间：
2018-11
期刊：
影响因子：
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通讯作者：
D. Sun;Y. Zhai;K. V. van Schooten;Chuang Zhang;M. Kavand;H. Malissa;M. Groesbeck;R. Menon;C. Boehme;Z. Vardeny
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文献类型：
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作者：
D. Sun;Y. Zhai;K. V. van Schooten;Chuang Zhang;M. Kavand;H. Malissa;M. Groesbeck;R. Menon;C. Boehme;Z. Vardeny
导电聚合物，其中原始聚合物被活性掺杂剂掺杂，由于其可调谐的电导率值，已被用于各种柔性光电器件应用。三十多年来，人们对这些材料中的电荷输运进行了深入研究。然而，这些化合物的自旋输运性质仍然难以捉摸。在这里，我们分别研究了轻掺杂和重掺杂的两种PEDOT:PSS聚合物中极化子主导和阱主导的自旋输运过程。利用脉冲自旋泵送和自旋注入技术，我们发现轻掺杂PEDOT:PSS薄膜的反自旋霍尔效应和磁电阻随温度和施加偏置的变化而改变，而重掺杂PEDOT:PSS薄膜则相反。我们的工作为研究导电聚合物薄膜中的自旋输运提供了另一种方法。
Conducting polymers, where pristine polymers are doped by active dopants, have been used in a variety of flexible optoelectronic device applications due to their tunable conductivity values. Charge transport in these materials has been intensively studied for over three decades. However, spin transport properties in these compounds have remained elusive. Here, we studied two polaron-dominated and trap-dominated spin transport processes in two types of PEDOT:PSS polymers that are lightly and heavily doped, respectively. Using pulsed spin-pumping and spin-injection techniques, we found the sign of inverse spin Hall effect and magnetoresistance obtained from the lightly doped PEDOT:PSS film can reverse its polarity as a function of temperature and applied bias, in contrast to that in the heavily doped PEDOT:PSS film. Our work provides an alternative approach for studying the spin transport in conducting polymer films.