Spin relaxation in graphene with self-assembled cobalt porphyrin molecules

S. Omar; M. Gurram; I. J. Vera-Marun; X. Zhang; E. H. Huisman; A. Kaverzin; B. L. Feringa; B. J. van Wees

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Spin relaxation in graphene with self-assembled cobalt porphyrin molecules

机译：自组装钴卟啉分子在石墨烯中的自旋弛豫

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In graphene spintronics, interaction of localized magnetic moments with the electron spins paves a new way to explore the underlying spin-relaxation mechanism. A self-assembled layer of organic cobalt porphyrin (CoPP) molecules on graphene provides a desired platform for such studies via the magnetic moments of porphyrin-bound cobalt atoms. In this work a study of spin-transport properties of graphene spin-valve devices functionalized with such CoPP molecules as a function of temperature via nonlocal spin-valve and Hanle spin-precession measurements is reported. For the functionalized (molecular) devices, we observe a decrease in the spin-relaxation time τ_s even up to 50%, which could be an indication of enhanced spin-flip scattering of the electron spins in graphene in the presence of the molecular magnetic moments. The effect of the molecular layer is masked for low-quality samples (low mobility), possibly due to dominance of Elliot-Yafet-type spin relaxation mechanisms.

机译：在石墨烯自旋电子学中，局部磁矩与电子自旋的相互作用为探索潜在的自旋弛豫机理开辟了新途径。石墨烯上的有机钴卟啉（CoPP）分子的自组装层通过与卟啉结合的钴原子的磁矩为此类研究提供了理想的平台。在这项工作中，通过非局部自旋阀和Hanle自旋进动测量，研究了用这类CoPP分子功能化的石墨烯自旋阀装置的自旋传输特性随温度的变化。对于功能化的（分子）器件，我们观察到自旋弛豫时间τ_s减少甚至高达50％，这可能表明存在分子磁矩时石墨烯中电子自旋的自旋翻转散射增强。。对于低质量样品（低迁移率），分子层的作用被掩盖了，这可能是由于Elliot-Yafet型自旋弛豫机制的优势。

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《Physical review》 |2015年第11期|115442.1-115442.6|共6页
作者
S. Omar; M. Gurram; I. J. Vera-Marun; X. Zhang; E. H. Huisman; A. Kaverzin; B. L. Feringa; B. J. van Wees;
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Physics of Nanodevices, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, Netherlands;

Physics of Nanodevices, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, Netherlands;

Physics of Nanodevices, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, Netherlands,School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, United Kingdom;

Stratingh Institute for Chemistry, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, Netherlands;

Physics of Nanodevices, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, Netherlands;

Physics of Nanodevices, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, Netherlands;

Stratingh Institute for Chemistry, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, Netherlands;

Physics of Nanodevices, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, Netherlands;

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magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields;

机译：磁电子学自旋电子学：利用自旋极化传输或集成磁场的设备;

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Spin relaxation in graphene with self-assembled cobalt porphyrin molecules

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