Tunable giant magnetoresistance in a single-molecule junction

Yang, Kai; Chen, Hui; Pope, Thomas; Hu, Yibin; Liu, Liwei; Wang, Dongfei; Lei, Tao; Xiao, Wende; Fei, Xiangmin; Zhang, Yuyang; Luo, Hong‐Gang; Du, Shixuan; Xiang, Tao; Hofer, Werner A.; Gao, Hongjun

doi:10.1038/s41467-019-11587-x

Cited by 67 publications

(96 citation statements)

References 57 publications

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“…In addition, an electrically tunable AMR was found in the Coulomb blockade regime in a ferromagnetic semiconductor single-electron transistor [18]. Recently, several experimental works [4,[19][20][21][22][23] on tuning AMR in single-molecule junctions have stimulated a new research venue in molecular spintronics, which is the socalled molecular AMR [24]. Quantitatively, AMR is defined as AMR = (G − G ⊥ )/G ⊥ , where G and G ⊥ are electrical conductances for parallel and perpendicular orientations of the magnetization, respectively, with regard to the current flow.…”

Section: Introductionmentioning

confidence: 99%

Giant anisotropic magnetoresistance through a tilted molecular π -orbital

Pauly

2020

Phys. Rev. Research

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Anisotropic magnetoresistance (AMR), originating from spin-orbit coupling (SOC), is the sensitivity of the electrical resistance in magnetic systems to the direction of spin magnetization. Although this phenomenon has been experimentally reported for several nanoscale junctions, a clear understanding of the physical mechanism behind it is still elusive. Here we discuss a concept based on orbital symmetry considerations to attain a significant AMR of up to 95% for a broad class of π-type molecular spin valves. It is illustrated at the benzene-dithiolate molecule connecting two monoatomic nickel electrodes. We find that SOC opens, via spin-flip events at the ferromagnet-molecule interface, a conduction channel, which is fully blocked by symmetry without SOC. Importantly, the interplay between two transport channels turns out to depend strongly on the magnetization direction in the nickel electrodes due to the tilting of molecular orbitals. Moreover, due to multiband quantum interference, appearing at the band edge of nickel electrodes, a transmission drop is observed just above the Fermi energy. Altogether, these effects lead to a significant AMR around the Fermi level, which even changes sign. Our theoretical understanding, corroborated in terms of ab initio calculations and simplified analytical models, reveals the general principles for an efficient realization of AMR in molecule-based spintronic devices.

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Section: Introductionmentioning

confidence: 99%

Giant anisotropic magnetoresistance through a tilted molecular π -orbital

Pauly

2020

Phys. Rev. Research

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“…The most commonly used molecules for spin switches contain spin‐crossover metal complexes and organic radical molecules. In this part, we will summarize the progress of single‐molecule spin switches in terms of external stimuli that trigger the switching process, including electric field, magnetic field and mechanical force …”

Section: Stimuli‐responsive Materials For Spin Switchesmentioning

confidence: 99%

“…Here, the magnetic field plays the role of the gate electrode to control the charge transport. By using the similar device structure but just replacing the Cu 2 N capped Cu(001) substrate with an Au(111) surface, Gao et al measured the charge transport of the same FePc molecule . By varying the magnetic field, the electron pathway could be switched between two molecular orbits, as shown in Figure A.…”

Section: Stimuli‐responsive Materials For Spin Switchesmentioning

confidence: 99%

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Electrical and spin switches in single‐molecule junctions

Duan

Huang

et al. 2019

InfoMat

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Single-molecule electrical and spin switches have been one of the main research focuses in molecular electronics and spintronics because they may form the most important elements for the future information technology, thus attracting great attention in the scientific community and witnessing significant progresses benefiting from the combination of physics, chemistry, materials, and engineering. The key issue of constructing single-molecule switches is the development of stimulus-responsive systems that provide bistable or multiple states. In this review, we summarize the recent advances of this field in terms of the external stimulus that induces the switching. A variety of external stimuli, such as light, electric field, magnetic field, mechanical force, and chemical stimulus, have been successfully employed to activate the reversible switching in single-molecule junctions by manipulating molecular structures, conformations, electronic states, and spin states. As a burgeoning field, we finally put forward the challenges in molecular electronics and spintronics that need to be solved, which will initiate intense research. K E Y W O R D Selectrical switch, single-molecule junction, spin switch, stimuli-responsive system

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“…The magnitude of R in the present experiments is comparable with most of the singlemolecule magnetoresistance systems reported in the literature. 39,40 To evaluate the effect of spin manipulation on charge transport, we further measured the singlemolecule conductance of ZnTPPF as a control experiment, which does not change the spin-state after adding an extra axial ligand ( Supplementary Figure 8). The UV-vis spectra show that the band of pure ZnTPPF at 425 nm shifts to 431 nm upon the addition of 3, 5-Lutidine (Supplementary Figure 3B), indicating the five-or six-coordinated complex was formed.…”

Section: Introductionmentioning

confidence: 99%

Room-Temperature Switching of Spin-State in Single-Molecule Junctions

et al. 2020

Preprint

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The emerging of molecular spintronics offers a unique chance for the design of molecular devices with different spin-state, and the control of spin-state becomes essential for molecular spin switches. However, the intrinsic spin switching from low-spin to high-spin state is a temperature-dependent process with a small energy barrier that low temperature is required to maintain the low-spin state, and thus the room-temperature operation of single-molecule devices have not yet been achieved. Here, we investigated the single-molecule charge transport through a diamagnetic square planar nickel(II) porphyrin using the scanning tunneling microscope break-junction (STM-BJ) technique. The reversible single-molecule conductance switches are demonstrated by utilizing a coordination-induced spin-state switching to manipulate the spin state between S = 0 and S = 1 at room temperature. Furthermore, the different coordinated complexes could be distinguished from the conductance traces, which cannot be realized by the ensemble investigations such as NMR and UV-vis spectrums. The combined DFT calculations revealed that the conductance changes come from the different spin-states of the molecules varying the number of coordination ligands, suggesting coordination-induced spin-state switching provides a new way towards room-temperature molecular spintronics.

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Tunable giant magnetoresistance in a single-molecule junction

Cited by 67 publications

References 57 publications

Giant anisotropic magnetoresistance through a tilted molecular π -orbital

Giant anisotropic magnetoresistance through a tilted molecular π -orbital

Electrical and spin switches in single‐molecule junctions

Room-Temperature Switching of Spin-State in Single-Molecule Junctions

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