Tunneling Spin Injection into Single Layer Graphene
Tunneling Spin Injection into Single Layer Graphene
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DOI:
10.1103/physrevlett.105.167202
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发表时间:
2010-10-12
影响因子:
8.6
通讯作者:
Kawakami, R. K.
中科院分区:
文献类型:
--
作者:
Han, Wei;Pi, K.;Kawakami, R. K.
We achieve tunneling spin injection from Co into single layer graphene (SLG) using TiO2 seeded MgO barriers. A nonlocal magnetoresistance (Delta R-NL) of 130 Omega is observed at room temperature, which is the largest value observed in any material. Investigating Delta R-NL vs SLG conductivity from the transparent to the tunneling contact regimes demonstrates the contrasting behaviors predicted by the drift-diffusion theory of spin transport. Furthermore, tunnel barriers reduce the contact-induced spin relaxation and are therefore important for future investigations of spin relaxation in graphene.