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Tunnel magnetoresistance in theB24N24 cage by the considering contacts type

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Abstract

In this research, spin-transport properties of the B24N24 molecule, when it is connected through a single and multiple atom contacts to two ferromagnetic electrodes have been investigated using the Landauer formula and the non-equilibrium Green’s function. The results show that the current has a stepwise behavior against the bias voltage; the off state of the B24N24 molecule occurs at low voltages, independent of the type of contact. The characteristic of the current in terms of the gate voltage is dependent on the contact type in usage, and generally less for single contact configurations as compared to those seen in multiple contact configurations. In the case of contacting one atom of the B24N24 molecule to electrodes, the B24N24 has conduction property, while in multiple contacts it shows property of a semiconductor. The Tunneling Magnetic Resistance (TMR) contained three peaks no matter of the contact type, and whose maxima for single and 4-atom (about 42%) and for 8-atom (about 37%) all occurred at zero bias voltage. The maxima of TMR for 6-atom arrangement went up at the bias voltages − 1.2 V and + 1.2 V, about 53%. And, last but not the least, the TMR maxima change locations as the voltage increases.

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Correspondence to Mojtaba Yaghobi.

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Mohammadmoradi, Y., Yaghobi, M., Yuonesi, M. et al. Tunnel magnetoresistance in theB24N24 cage by the considering contacts type. Int Nano Lett 10, 61–69 (2020). https://doi.org/10.1007/s40089-020-00294-x

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Keywords

  • Spin-dependent transport
  • Tunneling magnetoresistance
  • B24N24 cage
  • Non-equilibrium Green’s function