Tunable giant magnetoresistance in a single-molecule junction

Kai Yang, Hui Chen, Thomas Pope, Yibin Hu, Liwei Liu, Dongfei Wang, Lei Tao, Wende Xiao, Xiangmin Fei, Yu-Yang Zhang, Hong-Gang Luo, Shixuan Du, Tao Xiang, Werner A. Hofer () and Hong-Jun Gao ()
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Kai Yang: Chinese Academy of Sciences
Hui Chen: Chinese Academy of Sciences
Thomas Pope: Newcastle University
Yibin Hu: Chinese Academy of Sciences
Liwei Liu: Chinese Academy of Sciences
Dongfei Wang: Chinese Academy of Sciences
Lei Tao: Chinese Academy of Sciences
Wende Xiao: Chinese Academy of Sciences
Xiangmin Fei: Chinese Academy of Sciences
Yu-Yang Zhang: Chinese Academy of Sciences
Hong-Gang Luo: Lanzhou University
Shixuan Du: Chinese Academy of Sciences
Tao Xiang: Chinese Academy of Sciences
Werner A. Hofer: Chinese Academy of Sciences
Hong-Jun Gao: Chinese Academy of Sciences

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract Controlling electronic transport through a single-molecule junction is crucial for molecular electronics or spintronics. In magnetic molecular devices, the spin degree-of-freedom can be used to this end since the magnetic properties of the magnetic ion centers fundamentally impact the transport through the molecules. Here we demonstrate that the electron pathway in a single-molecule device can be selected between two molecular orbitals by varying a magnetic field, giving rise to a tunable anisotropic magnetoresistance up to 93%. The unique tunability of the electron pathways is due to the magnetic reorientation of the transition metal center, resulting in a re-hybridization of molecular orbitals. We obtain the tunneling electron pathways by Kondo effect, which manifests either as a peak or a dip line shape. The energy changes of these spin-reorientations are remarkably low and less than one millielectronvolt. The large tunable anisotropic magnetoresistance could be used to control electronic transport in molecular spintronics.

Date: 2019
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DOI: 10.1038/s41467-019-11587-x

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