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Chin. Phys. B, 2024, Vol. 33(4): 047201    DOI: 10.1088/1674-1056/ad1e65
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Anisotropic spin transport and photoresponse characteristics detected by tip movement in magnetic single-molecule junction

Deng-Hui Chen(陈登辉), Zhi Yang(羊志), Xin-Yu Fu(付新宇), Shen-Ao Qin(秦申奥), Yan Yan(严岩), Chuan-Kui Wang(王传奎), Zong-Liang Li(李宗良), and Shuai Qiu(邱帅)
Shandong Key Laboratory of Medical Physics and Image Processing & Shandong Provincial Engineering and Technical Center of Light Manipulations, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
Abstract  Orientation-dependent transport properties induced by anisotropic molecules are enticing in single-molecule junctions. Here, using the first-principles method, we theoretically investigate spin transport properties and photoresponse characteristics in trimesic acid magnetic single-molecule junctions with different molecular adsorption orientations and electrode contact sites. The transport calculations indicate that a single-molecule switch and a significant enhancement of spin transport and photoresponse can be achieved when the molecular adsorption orientation changes from planar geometry to upright geometry. The maximum spin polarization of current and photocurrent in upright molecular junctions exceeds 90%. Moreover, as the Ni tip electrode moves, the tunneling magnetoresistance of upright molecular junctions can be increased to 70%. The analysis of the spin-dependent PDOS elucidates that the spinterfaces between organic molecule and ferromagnetic electrodes are modulated by molecular adsorption orientation, where the molecule in upright molecular junctions yields higher spin polarization. Our theoretical work paves the way for designing spintronic devices and optoelectronic devices with anisotropic functionality base on anisotropic molecules.
Keywords:  molecular spintronics      spin polarization      tunneling magnetoresistance      photocurrent      single-molecule junctions  
Received:  12 October 2023      Revised:  01 January 2024      Accepted manuscript online:  15 January 2024
PACS:  72.25.-b (Spin polarized transport)  
  75.47.-m (Magnetotransport phenomena; materials for magnetotransport)  
  85.75.-d (Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11974217, 12204281, and 21933002) and the Shandong Provincial Natural Science Foundation (Grant No. ZR2022QA068).
Corresponding Authors:  Zong-Liang Li, Shuai Qiu     E-mail:  lizongliang@sdnu.edu.cn;shuaiqiu@sdnu.edu.cn

Cite this article: 

Deng-Hui Chen(陈登辉), Zhi Yang(羊志), Xin-Yu Fu(付新宇), Shen-Ao Qin(秦申奥), Yan Yan(严岩), Chuan-Kui Wang(王传奎), Zong-Liang Li(李宗良), and Shuai Qiu(邱帅) Anisotropic spin transport and photoresponse characteristics detected by tip movement in magnetic single-molecule junction 2024 Chin. Phys. B 33 047201

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