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Journal of Materials Science
Erschienen in: Journal of Materials Science 34/2020

08.09.2020 | Electronic materials

Protonation control of spin transport properties in magnetic single-molecule junctions

verfasst von: Shuai Qiu, Yuan-Yuan Miao, Guang-Ping Zhang, Jun-Feng Ren, Chuan-Kui Wang, Gui-Chao Hu

Erschienen in: Journal of Materials Science | Ausgabe 34/2020

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Abstract

The protonation-controlled conductance switching of 4,4′-vinylenedipyridine (44VDP) molecular junctions was experimentally reported by Brooke et al. (Nano Lett 18(2): 1317–1322, 2018), where a change induced by protonation in the bonding at the molecule–metal interface was proposed as the key ingredient. Here, we perform a first-principles study on the spin-dependent transport properties of 44VDP molecular junctions modulated by protonation. The switching mechanism in the experiment is clarified; namely, the weak coupling strength at the molecule–metal interface is triggered by protonation of pyridyl groups in the 44VDP molecule. In particular, the protonation process modifies the organic–ferromagnetic spinterface, which reduces the number of hybrid interface states and causes an inversion of tunneling magnetoresistance from positive to negative values. Furthermore, a protonation-induced excellent spin-filtering effect is realized. This work sheds light on the mechanism of protonation at the organic–ferromagnetic interface and provides a promising way to realize multifunctional devices in organic spintronics.
Vorheriger Artikel High-performance acetone gas sensor based on ferrite–DyFeO3
Nächster Artikel Porous carbon nanosheets derived from expanded graphite for supercapacitors and sodium-ion batteries

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Metadaten
Titel
Protonation control of spin transport properties in magnetic single-molecule junctions
verfasst von
Shuai Qiu
Yuan-Yuan Miao
Guang-Ping Zhang
Jun-Feng Ren
Chuan-Kui Wang
Gui-Chao Hu
Publikationsdatum
08.09.2020
Verlag
Springer US
Erschienen in
Journal of Materials Science / Ausgabe 34/2020
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-020-05213-1

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