Electrically triggered spin reversal and precise control of spin polarization for electron transport at the single-molecule level

Author:

Zeng Hong-Li123ORCID,Zhao Hong-Ru1ORCID,Guo Yan-Dong123ORCID,Zhao Xue1,Wang Yu-Hao2ORCID,Lin Li-Yan12,Ma Ao12ORCID,Yan Xiao-Hong134

Affiliation:

1. College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications 1 , Nanjing 210046, China

2. College of Natural Science, Nanjing University of Posts and Telecommunications 2 , Nanjing 210046, China

3. Key Laboratory of Radio Frequency and Micro-Nano Electronics of Jiangsu Province 3 , Nanjing 210023, China

4. College of Science, Nanjing University of Aeronautics and Astronautics 4 , Nanjing 210016, China

Abstract

Different from conventional ferromagnetic methods, producing a spin-polarized current through electrical ways in spintronic devices can greatly increase operating speed, reduce power consumption, and improve device integration. Inspired by recent experimental progress on the synthesis of a heptauthrene molecule, we investigate its spin-dependent transport contacted with Au electrodes through first-principles calculations. By applying a gate voltage, the transmission can be switched between completely spin-up and spin-down polarized states, achieving an electrically controlled dual-spin filter. Furthermore, a fine tuning on the spin polarization, between 100% and −100%, can also be realized, where the transport with any ratio of spin-up to spin-down electron quantities can be realized beyond the traditional devices. The peculiar transmission spectra and their shift are found to play crucial roles, where transmission peaks distribute on both sides of the Fermi level with opposite spin components. Such a spin-polarization modulating effect is found to be robust to the molecule-electrode contacting site, indicating it is an intrinsic feature of such systems. Moreover, the dimension of the device is at the single-molecule level, suggesting great application potential.

Funder

National Nature Science Foundation of China

Natural Science Foundational of Jiangsu Province

Natural Science Foundation of Nanjing University of Posts and Telecommunications

Publisher

AIP Publishing

Subject

General Physics and Astronomy

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