Nanosecond Spin Lifetimes in Single- and Few-Layer Graphene鈥揾BN Heterostructures at Room Temperature

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• 作者：Marc Dr枚geler ; Frank Volmer ; Maik Wolter ; Bernat Terr茅s ; Kenji Watanabe ; Takashi Taniguchi ; Gernot G眉ntherodt ; Christoph Stampfer ; Bernd Beschoten
• 刊名：Nano Letters
• 出版年：2014
• 出版时间：November 12, 2014
• 年：2014
• 卷：14
• 期：11
• 页码：6050-6055
• 全文大小：367K
• ISSN：1530-6992

文摘

We present a new fabrication method of graphene spin-valve devices that yields enhanced spin and charge transport properties by improving both the electrode-to-graphene and graphene-to-substrate interface. First, we prepare Co/MgO spin injection electrodes onto Si⁺⁺/SiO₂. Thereafter, we mechanically transfer a graphene鈥揾BN heterostructure onto the prepatterned electrodes. We show that room temperature spin transport in single-, bi-, and trilayer graphene devices exhibit nanosecond spin lifetimes with spin diffusion lengths reaching 10 渭m combined with carrier mobilities exceeding 20鈥?00 cm²/(V s).

Keywords:

Graphene; boron nitride; spin transport; Hanle precession