Momentum matching induced giant magnetoresistance in two-dimensional magnetic tunnel junctions

Qiu, Yaohua; Liu, Chun-Sheng; Shi, Xingqiang; Zheng, Xiaohong; Zhang, Lei

doi:10.1039/d3cp03121g

Cited by 4 publications

(1 citation statement)

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“…The Joule heat from charge current is a waste of energy. To build devices with low power consumption, spintronics has been essentially and widely applied in emerging nano-devices, which solves the problem by using the freedom of spin degree instead of charge [1][2][3][4]. Spin current is one of the most important physical parameters of spintronics devices [5].…”

Section: Introductionmentioning

confidence: 99%

Tunable pure spin current realized by photogalvanic effect in triangulene dimer based nano-devices

Dong,

Tao,

et al. 2024

Phys. Scr.

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The unique magnetic properties of triangulene and its homologues have generated a great deal of interest in recent years. Triangulene dimers, with their magnetic ground states and the detection of singlet-triplet spin excitations, have been synthesized on-surface by Mishra, and shown to be suitable for spintronics applications. In our study, we use first-principles calculations to investigate the photogalvanic effect (PGE) of triangulene dimers based nano-devices. The devices are constructed by two graphene nanoribbon electrodes and a triangulene dimer molecule connected by carbon chains, which has a spatial inversion symmetry. We find that when light irradiation is applied to the device, there are both spin-up and spin-down current induced with the same magnitude and opposite flowing directions. In this case, there is no accompanying charge current, but a finite pure spin current arises. Furthermore, we find that the currents generated by PGE can be tuned by impurity states. When nitrogen atoms are doped into the triangulene dimer molecule, we observe the emergence of impurity states, which supply other electron transition modes and result in a photo-current under different photon energy. Our findings provide a useful insight into the real application of tunable photoelectric carbon-based nano-devices. The PGE properties of triangulene dimers can be applied in the development of efficient spintronics devices.

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Section: Introductionmentioning

confidence: 99%

Tunable pure spin current realized by photogalvanic effect in triangulene dimer based nano-devices

Dong,

Tao,

et al. 2024

Phys. Scr.

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The magneto thermoelectric coefficients of double quantum dots in series connected to ferromagnetic electrodes

Najdi,

Mudhafer,

AL-Mukh

et al. 2024

Journal of Magnetism and Magnetic Materials

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Pure spin current generation with photogalvanic effects in h-BN/graphene/h-BN van der Waals vertical heterostructures

Tao,

Jiang,

Dong

et al. 2024

Phys. Chem. Chem. Phys.

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Momentum matching induced giant magnetoresistance in two-dimensional magnetic tunnel junctions

Abstract: Giant magnetoresistance was first experimentally discovered in three-dimensional magnetic tunnel junctions (MTJs) in late 1980s and is of great importance in nonvolatile memory applications. How to achieve a magnetoresistance as...

Cited by 4 publications

References 46 publications

Tunable pure spin current realized by photogalvanic effect in triangulene dimer based nano-devices

Tunable pure spin current realized by photogalvanic effect in triangulene dimer based nano-devices

The magneto thermoelectric coefficients of double quantum dots in series connected to ferromagnetic electrodes

Pure spin current generation with photogalvanic effects in h-BN/graphene/h-BN van der Waals vertical heterostructures

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