Length dependence of rectification in organic co-oligomer spin rectifiers

doi:10.1088/1674-1056/25/5/057308

中国物理B ›› 2016, Vol. 25 ›› Issue (5): 57308-057308.doi: 10.1088/1674-1056/25/5/057308

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Length dependence of rectification in organic co-oligomer spin rectifiers

Gui-Chao Hu(胡贵超), Zhao Zhang(张朝), Ying Li(李营), Jun-Feng Ren(任俊峰), Chuan-Kui Wang(王传奎)

School of Physics and Electronics, Shandong Normal University, Jinan 250014, China

收稿日期:2015-12-23 修回日期:2016-01-20 出版日期:2016-05-05 发布日期:2016-05-05
通讯作者: Gui-Chao Hu E-mail:hgc@sdnu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11374195), the Natural Science Foundation of Shandong Province, China (Grant No. ZR2014AM017), the Taishan Scholar Project of Shandong Province, China, and the Excellent Young Scholars Research Fund of Shandong Normal University, China.

Length dependence of rectification in organic co-oligomer spin rectifiers

Gui-Chao Hu(胡贵超), Zhao Zhang(张朝), Ying Li(李营), Jun-Feng Ren(任俊峰), Chuan-Kui Wang(王传奎)

School of Physics and Electronics, Shandong Normal University, Jinan 250014, China

Received:2015-12-23 Revised:2016-01-20 Online:2016-05-05 Published:2016-05-05
Contact: Gui-Chao Hu E-mail:hgc@sdnu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11374195), the Natural Science Foundation of Shandong Province, China (Grant No. ZR2014AM017), the Taishan Scholar Project of Shandong Province, China, and the Excellent Young Scholars Research Fund of Shandong Normal University, China.

摘要/Abstract

摘要： The rectification ratio of organic magnetic co-oligomer diodes is investigated theoretically by changing the molecular length. The results reveal two distinct length dependences of the rectification ratio: for a short molecular diode, the charge-current rectification changes little with the increase of molecular length, while the spin-current rectification is weakened sharply by the length; for a long molecular diode, both the charge-current and spin-current rectification ratios increase quickly with the length. The two kinds of dependence switch at a specific length accompanied with an inversion of the rectifying direction. The molecular ortibals and spin-resolved transmission analysis indicate that the dominant mechanism of rectification suffers a change at this specific length, that is, from asymmetric shift of molecular eigenlevels to asymmetric spatial localization of wave functions upon the reversal of bias. This work demonstrates a feasible way to control the rectification in organic co-oligomer spin diodes by adjusting the molecular length.

关键词: organic spintronics, organic ferromagnet, rectification

Abstract: The rectification ratio of organic magnetic co-oligomer diodes is investigated theoretically by changing the molecular length. The results reveal two distinct length dependences of the rectification ratio: for a short molecular diode, the charge-current rectification changes little with the increase of molecular length, while the spin-current rectification is weakened sharply by the length; for a long molecular diode, both the charge-current and spin-current rectification ratios increase quickly with the length. The two kinds of dependence switch at a specific length accompanied with an inversion of the rectifying direction. The molecular ortibals and spin-resolved transmission analysis indicate that the dominant mechanism of rectification suffers a change at this specific length, that is, from asymmetric shift of molecular eigenlevels to asymmetric spatial localization of wave functions upon the reversal of bias. This work demonstrates a feasible way to control the rectification in organic co-oligomer spin diodes by adjusting the molecular length.

Key words: organic spintronics, organic ferromagnet, rectification

中图分类号: (Electronic transport in nanoscale materials and structures)

73.63.-b

75.10.Lp (Band and itinerant models) 85.75.-d (Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields)

胡贵超, 张朝, 李营, 任俊峰, 王传奎. Length dependence of rectification in organic co-oligomer spin rectifiers[J]. 中国物理B, 2016, 25(5): 57308-057308.

Gui-Chao Hu(胡贵超), Zhao Zhang(张朝), Ying Li(李营), Jun-Feng Ren(任俊峰), Chuan-Kui Wang(王传奎). Length dependence of rectification in organic co-oligomer spin rectifiers[J]. Chin. Phys. B, 2016, 25(5): 57308-057308.

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Length dependence of rectification in organic co-oligomer spin rectifiers

Length dependence of rectification in organic co-oligomer spin rectifiers

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