Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-04-26
J. Phys.:Cond. Mat. 22, (2010), 186004
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
17pages, 7figures
Scientific paper
10.1088/0953-8984/22/18/186004
The spin transfer effect in ferromagnet-quantum dot (insulator)-ferromagnet Aharonov-Bohm (AB) ring system with Rashba spin-orbit (SO) interactions is investigated by means of Keldysh nonequilibrium Green function method. It is found that both the magnitude and direction of the spin transfer torque (STT) acting on the right ferromagnet electrode can be effectively controlled by changing the magnetic flux threading the AB ring or the gate voltage on the quantum dot. The STT can be greatly augmented by matching a proper magnetic flux and an SO interaction at a cost of low electrical current. The STT, electrical current, and spin current are uncovered to oscillate with the magnetic flux. The present results are expected to be useful for information storage in nanospintronics.
Chen Xi
Su Gang
Zheng Qing-Rong
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