Probing tunneling spin injection into graphene via bias dependence
Probing tunneling spin injection into graphene via bias dependence
复制标题
通过偏置依赖性探测石墨烯中的隧道自旋注入
DOI:
10.1103/physrevb.98.054412
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发表时间:
2018
影响因子:
3.7
通讯作者:
Kawakami, Roland K.
中科院分区:
文献类型:
--
作者:
Zhu, Tiancong;Singh, Simranjeet;Katoch, Jyoti;Wen, Hua;Belashchenko, Kirill;Žutić, Igor;Kawakami, Roland K.
The bias dependence of spin injection in graphene lateral spin valves is systematically studied to determine the factors affecting the tunneling spin injection efficiency. Three types of junctions are investigated, including MgO and hexagonal boron nitride (hBN) tunnel barriers and direct contacts. A dc bias current applied to the injector electrode induces a strong nonlinear bias dependence of the nonlocal spin signal for both MgO and hBN tunnel barriers. Furthermore, this signal reverses its sign at a negative dc bias for both kinds of tunnel barriers. The analysis of the bias dependence for injector electrodes with a wide range of contact resistances suggests that the sign reversal correlates with bias voltage rather than current. We consider different mechanisms for nonlinear bias dependence and conclude that the energy-dependent spin-polarized electronic structure of the ferromagnetic electrodes, rather than the electrical field-induced spin drift effect or spin filtering effect of the tunnel barrier, is the most likely explanation of the experimental observations.
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影响因子:
4
作者:
Singh, Simranjeet;Katoch, Jyoti;Kawakami, Roland
通讯作者:
Kawakami, Roland
DOI:
--
发表时间:
2017
期刊:
Nano letters (Print)
影响因子:
--
作者:
Simranjeet Singh;J. Katoch;T. Zhu;Ryan J. Wu;Adam S. Ahmed;W. Amamou;Dongying Wang;K. Mkhoyan;Roland K. Kawakami
通讯作者:
Roland K. Kawakami
影响因子:
2.4
作者:
Jiaxi Hu;G. Stecklein;Y. Anugrah;P. Crowell;S. Koester
通讯作者:
S. Koester
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
E. Sosenko;Huazhou Wei;V. Aji
通讯作者:
V. Aji
DOI:
--
发表时间:
2013
期刊:
影响因子:
--
作者:
I. Neumann;M. Costache;G. Bridoux;J. F. Sierra;S. Valenzuela
通讯作者:
S. Valenzuela