Title: Electronegative ligands enhance charge transfer to Mn ₁₂ single-molecule magnets deposited on graphene

Abstract

Combining single-molecule magnets (SMMs) and emergent two-dimensional substrates such as graphene may lead to device configurations that are promising for spintronics and quantum computing. Yet, to fully consider the unique features of SMMs anchored to two-dimensional substrates, the choice of ligand attachments, which could affect the magnetic and electronic properties, is critical. In this work, we focus on hybrid junctions comprising CVD-grown graphene and [Mn ${}_{12}$O ${}_{12}$(O ${}_2$CR) ${}_{16}$(H ${}_2$O) ${}_4$]( $\mathrm{R}={\mathrm{CH}}_3,{\mathrm{CHCl}}_2$) SMMs with different ligands. We find that [Mn ${}_{12}$O ${}_{12}$(O ${}_2$CCH ${}_3$) ${}_{16}$(H ${}_2$O) ${}_4$] SMMs barely change the graphene’s conductivity, while [Mn ${}_{12}$O ${}_{12}$(O ${}_2$CCHCl ${}_2$) ${}_{16}$(H ${}_2$O) ${}_4$] SMMs with more electronegative ligands, by means of charge transfer, remarkably modify the electronic transport in graphene as revealed by gate-voltage dependent magnetotransport measurements.

Authors:

Zhu, Xiaochen  ^[1];

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• Search OSTI.GOV for ORCID "0000-0003-4571-9628"
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Hale, Ashlyn  ^[1];

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Christou, George  ^[1];

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Hebard, Arthur F.  ^[1]

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• Search OSTI.GOV for ORCID "0000-0002-0996-1735"
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+ Show Author Affiliations

1. Univ. of Florida, Gainesville, FL (United States)

Publication Date:

2020-02-12

Research Org.:

Energy Frontier Research Centers (EFRC) (United States). Center for Molecular Magnetic Quantum Materials (M2QM); Univ. of Florida, Gainesville, FL (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:

1601768

Alternate Identifier(s):

OSTI ID: 1599260

Grant/Contract Number:  

SC0019330

Resource Type:

Journal Article: Accepted Manuscript

Journal Name:

Journal of Applied Physics

Additional Journal Information:

Journal Volume: 127; Journal Issue: 6; Journal ID: ISSN 0021-8979

Publisher:

American Institute of Physics (AIP)

Country of Publication:

United States

Language:

English

Subject:

74 ATOMIC AND MOLECULAR PHYSICS