We proposed a single-molecule magnetic junction (SMMJ), composed of a dissociated amine-ended benzene sandwiched between two Co tip-like nanowires. To better simulate the break junction technique for real SMMJs, the first-principles calculation associated with the hard-hard coupling between a amine-linker and Co tip-atom is carried out for SMMJs with mechanical strain and under an external bias. We predict an anomalous magnetoresistance (MR) effect, including strain-induced sign reversal and bias-induced enhancement of the MR value, which is in sharp contrast to the normal MR effect in conventional magnetic tunnel junctions. The underlying mechanism is the interplay between four spin-polarized currents in parallel and anti-parallel magnetic configurations, originated from the pronounced spin-up transmission feature in the parallel case and spiky transmission peaks in other three spin-polarized channels. These intriguing findings may open a new arena in which magnetotransport and hard-hard coupling are closely coupled in SMMJs and can be dually controlled either via mechanical strain or by an external bias.
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14 June 2017
Research Article|
June 08 2017
Hard-hard coupling assisted anomalous magnetoresistance effect in amine-ended single-molecule magnetic junction
Y.-H. Tang;
Y.-H. Tang
a)
Department of Physics, National Central University
, Jung-Li 32001, Taiwan
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C.-J. Lin;
C.-J. Lin
Department of Physics, National Central University
, Jung-Li 32001, Taiwan
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K.-R. Chiang
K.-R. Chiang
Department of Physics, National Central University
, Jung-Li 32001, Taiwan
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a)
E-mail: [email protected]
J. Chem. Phys. 146, 224701 (2017)
Article history
Received:
February 24 2017
Accepted:
May 19 2017
Citation
Y.-H. Tang, C.-J. Lin, K.-R. Chiang; Hard-hard coupling assisted anomalous magnetoresistance effect in amine-ended single-molecule magnetic junction. J. Chem. Phys. 14 June 2017; 146 (22): 224701. https://doi.org/10.1063/1.4984821
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