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

作　　者：陈登辉 羊志 付新宇 秦申奥 严岩 王传奎 李宗良 邱帅 Deng-Hui Chen;Zhi Yang;Xin-Yu Fu;Shen-Ao Qin;Yan Yan;Chuan-Kui Wang;Zong-Liang Li;Shuai Qiu(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)

机构地区：[1]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

出　　处：《Chinese Physics B》2024年第4期640-648,共9页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos.11974217,12204281,and 21933002);the Shandong Provincial Natural Science Foundation (Grant No.ZR2022QA068)。

摘　　要：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.

关 键 词：molecular spintronics spin polarization tunneling magnetoresistance PHOTOCURRENT single-molecule junctions 

分 类 号：O469[理学—凝聚态物理]