Oscillatory tunnel magnetoresistance in a carbon nanotube based three-terminal magnetic tunnel junction

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Electrostatic control of tunnel magnetoresistance (TMR) in a carbon nanotube (CNT)-based three-terminal magnetic tunnel junction (MTJ) is critical to the development of next-generation nanospintronics. Using a quantum transport approach that explicitly considers the electronic structure of the junction including the exchange-interaction effects due to spin alignments at the ferromagnetic electrodes, we have unraveled the origin behind the gate bias dependent modulation of the TMR in a single-walled CNT-based MTJ. Akin to the experimental observation, our calculation yields an oscillatory behavior in TMR with a strong variation in the amplitude and width of the magnetoresistance signal with gate bias. We attribute the gate-bias-driven nonlinear change in the strength of spin-dependent hybridization at the nanotube/contact interface as the main cause for the observed oscillatory feature in TMR.

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© 2018 American Chemical Society. Publisher's version of record: https://dx.doi.org/10.1021/acs.jpcc.8b10458

Publication Title

Journal of Physical Chemistry C