Rationally Designed High-Performance Spin Filter Based on Two-Dimensional Half-Metal Cr2NO2
Rationally Designed High-Performance Spin Filter Based on Two-Dimensional Half-Metal Cr2NO2
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合理设计的基于二维半金属Cr2NO2的高性能旋转过滤器
DOI：
10.1016/j.matt.2019.07.022
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发表时间：
2019-11
期刊：
影响因子：
18.9
通讯作者：
Chen Liang
中科院分区：
文献类型：
--
作者：
Yang Jianhui;Zhang Shaozheng;Li Lei;Wang Anping;Zhong Zhicheng;Chen Liang
半金属材料具有独特的电子结构，表现出自旋态的导电性和自旋下态的带隙，是设计高效自旋滤光片的理想材料。本文基于第一性原理计算，证明了利用居里温度为566K的二维半金属材料Cr2NO2设计出了性能优良的超薄自旋滤光器。我们的结果表明，颠覆双层Cr2NO2的自旋排列，从平行到反平行所需的能量很低。双层Cr2NO2在夹在Au/Cr2NO2/Au异质结中时保持其半金属行为。由于Au/Cr2NO2/Au的半金属特性，在10 mV的低电压下，Au/Cr2NO2/Au的总电流可以达到15nA/个基元的平行态。在低电压下，磁电阻率为9333%。强韧的半金属行为、高居里温度和二维结构使Cr2NO2成为一种理想的超薄自旋滤波材料，具有高开关比和低能耗的特点。
Half-metals are promising candidates for designing efficient spin filters owing to their unique electronic structures, which show the electrical conductivity for spin-up states and a band gap for spin-down states. Herein, designing excellent ultrathin spin filters by using half-metal two-dimensional Cr2NO2, which has a Curie temperature of 566 K, is demonstrated based on first-principles calculations. Our results reveal that the required energy to overturn the spin arrangement of bilayer Cr2NO2, from parallel to anti-parallel states, is quite low. The bilayer Cr2NO2maintains its half-metal behavior while sandwiched within the Au/Cr2NO2/Au heterojunction. Owing to the half-metal characteristic, the total current of Au/Cr2NO2/Au can reach a value of 15 nA per primitive cell under a low voltage of 10 mV in parallel states. The magnetoresistance ratio is 9,333% at low voltage. The robust half-metal behavior, high Curie temperature, and two-dimensional structure make Cr2NO2an ideal ultrathin spin-filtering material with high switching ratio and low energy consumption.
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影响因子：
10.8
作者：
Tiancheng Song;M. Tu;Caitlin Carnahan;Xinghan Cai;T. Taniguchi;Kenji Watanabe;M. McGuire;D. Cobden;Di Xiao;W. Yao;Xiaodong Xu
通讯作者：
Tiancheng Song;M. Tu;Caitlin Carnahan;Xinghan Cai;T. Taniguchi;Kenji Watanabe;M. McGuire;D. Cobden;Di Xiao;W. Yao;Xiaodong Xu
影响因子：
4
作者：
Jianhui Yang;Xumeng Zhou;Xuepiao Luo;Shaozheng Zhang;Liang Chen
通讯作者：
Jianhui Yang;Xumeng Zhou;Xuepiao Luo;Shaozheng Zhang;Liang Chen
影响因子：
17.1
作者：
S. Mandal;R. Pati
通讯作者：
S. Mandal;R. Pati
DOI：
10.1007/978-1-4612-0869-3
发表时间：
1994
期刊：
--
影响因子：
--
作者：
A. Auerbach
通讯作者：
A. Auerbach
影响因子：
3.7
作者：
Kresse, G;Furthmuller, J
通讯作者：
Furthmuller, J