Single-molecule anisotropic magnetoresistance at room temperature: Influence of molecular structure

Li, Jijun; Chen, Zhaobin; Wang, Yahao; Zhou, Xiao‐Shun; Xie, Liqiang; Shi, Zhan; Liu, Jinxuan; Yan, Jiawei; Mao, Bing‐Wei

doi:10.1016/j.electacta.2021.138760

Cited by 12 publications

(8 citation statements)

References 55 publications

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“…22 Many studies also show that the attenuation factor depends on the anchoring groups of the molecules in the MJs. 23,24 The influence of various anchoring groups on junction formation and electrical transport properties has also been established, with anchoring groups investigated including thiol, 25 amino, 26,27 pyridyl, 28,29 carboxylic acid, 30,31 dimethyl phosphine, 25 methyl sulfide, 32 and isocyanides. 29,33 However, for the same molecular backbones, different anchoring groups often (but not always) only weakly affect the attenuation factors of the molecular junction.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Moreover, π-conjugated molecules with nonaromatic systems were reported with lower β values than purely aromatic molecules, such as alkenes (2.2 nm –1 ) and alkynes (0.6 nm –1 ) . Many studies also show that the attenuation factor depends on the anchoring groups of the molecules in the MJs. , The influence of various anchoring groups on junction formation and electrical transport properties has also been established, with anchoring groups investigated including thiol, amino, , pyridyl, , carboxylic acid, , dimethyl phosphine, methyl sulfide, and isocyanides. , However, for the same molecular backbones, different anchoring groups often (but not always) only weakly affect the attenuation factors of the molecular junction. Examples of analysis for the anchoring group’s influence on the attenuation factor include a study from Park et al, where the length dependence of amine, dimethyl phosphine, and methyl sulfide-terminated alkanes was considered and a small difference in the β value of each MJ was found .…”

Section: Introductionmentioning

confidence: 99%

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Asymmetric Effect on the Length Dependence of Oligo(Phenylene ethynylene)-Based Molecular Junctions

et al. 2022

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It is well known that the electrical conductance of molecular junctions in the tunneling regime varies exponentially with the length of the molecular backbone. This behavior is strongly influenced by anchoring groups, which connect the molecular backbone to the electrodes and locate the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) resonances with respect to the Fermi level. Nevertheless, most of the studies have been performed on symmetric junctions, namely, using the same electrodes and anchoring groups at both sides of the junctions. Only recently, there have been some reports detailing the influence of introducing asymmetry into single-molecule junctions, using different contacts or different anchoring groups at either end of the molecular bridge. These studies have revealed that such junction asymmetry strongly impacts electrical characteristics. In this study, Au and graphene electrodes were used to provide asymmetry to a single-molecule junction. The conductance and length dependence of amine and methyl sulfide-terminated oligo(phenylene ethynylene) have been determined experimentally and theoretically. The impact of introducing this asymmetry has been quantified by comparing the conductance and β values of oligo(phenylene ethynylene) (OPE)-based molecules within Au/Au electrodes and Au/graphene junctions, respectively. Our results show that the introduction of a graphene electrode leads to lower conductance values and attenuation factors, similar to what has been previously observed in alkane chains. This is attributed to a shift of the electronic molecular levels toward the Fermi level, mainly driven by acetylene groups linking adjacent phenyl groups.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Asymmetric Effect on the Length Dependence of Oligo(Phenylene ethynylene)-Based Molecular Junctions

et al. 2022

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“…Alternatively, MR properties in SM devices have been also observed using diamagnetic molecules connected to ferromagnetic electrodes. [3,8,[16][17][18] In such scenario, the wired molecule plays no role in the MR response [8] acting as a mere conductor, leaving the control of the MR effect to the relative magnetization orientation of both the spin-drain and spin-source electrodes, which, in turn, is controlled by spinterface effects generated at the molecule/electrodes interface. The latter MR SM junctions are regarded as a molecular approach of giant magnetoresistance "GMR".…”

Section: Molecules With Paramagnetic Centresmentioning

confidence: 99%

“…The magnetization of the spin-polarized electrode can be done either ex-situ or in-situ by placing a permanent magnet in close proximity to the ferromagnetic electrode. [7,8]…”

Section: Introduction: a Magnetoresistive Single-molecule Device:basi...mentioning

confidence: 99%

Magnetoresistive Single‐Molecule Junctions: the Role of the Spinterface and the CISS Effect

Aragonès

Aravena

Ugalde

et al. 2022

Israel Journal of Chemistry

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This review is an effort in putting together the latest results about room‐temperature magnetoresistive (MR) effects in nanoscale/single‐molecule electronic devices consisting of one (few) molecule(s) placed in electrical contact between two nanoscale electrodes. Molecules represent powerful building blocks for developing state‐of‐the‐art MR devices, as they bring long spin relaxation timescales, low cost and high tunability of their electrical and magnetic properties via chemical modifications. The capability to control at room temperature and under bespoke electrodes’ magnetization the MR response of a single‐molecule (SM) device has been a longstanding quest. Such SM platforms could serve as fundamental tools to understand what the main mechanistic ingredients of MR effects in a molecular device are, leading to their use as building‐blocks for miniaturization in spintronic applications. The work carried out so far in this field has identified two key components directly involved in the MR response of a single(few)‐molecule(s) device: (i) The molecule|electrode spinterface, defining the interplay between interfacial electrostatics and spin density, has been proven to play a fundamental role in the interpretation of the observed single‐molecule junction's MR effects, which is governed by the electrode material and the electrode‐molecule chemistry. (ii) Two aspects of the molecular structure have been demonstrated to be involved in the spin‐dependent conduction mechanism: (1) the presence of paramagnetic metal centres in the molecular structure and how their orbitals bearing the unpaired electrons couple with the device electrodes, and (2), the degree of chirality within the molecular wire. This contribution will focus on the above points (i‐ii) by making use of specific examples in the literature.

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“…19 When a metal serves as an electrocatalyst, a small modulation in its surface crystal structure will create substantial changes in its contact with adsorbed molecules. 20,21 It is often thought that this feature, in turn, offers an opportunity to improve the performance of electrocatalysts. 22–24 Nevertheless, the in situ modulation of the surface structure with atomic precision remains a challenge in the engineering of metallic crystals.…”

Section: Introductionmentioning

confidence: 99%

In situ lattice tuning of quasi-single-crystal surfaces for continuous electrochemical modulation

et al. 2022

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Single-molecule anisotropic magnetoresistance at room temperature: Influence of molecular structure

Cited by 12 publications

References 55 publications

Asymmetric Effect on the Length Dependence of Oligo(Phenylene ethynylene)-Based Molecular Junctions

Asymmetric Effect on the Length Dependence of Oligo(Phenylene ethynylene)-Based Molecular Junctions

Magnetoresistive Single‐Molecule Junctions: the Role of the Spinterface and the CISS Effect

In situ lattice tuning of quasi-single-crystal surfaces for continuous electrochemical modulation

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