Spin Current and Current-Induced Spin Transfer Torque in Ferromagnet-Quantum Dot-Ferromagnet Coupled Systems

Abstract

Based on Keldysh's nonequilibrium Green function method, the spin-dependent transport properties in a ferromagnet-quantum dot (QD)-ferromagnet coupled system are investigated. It is shown the spin current shows quite different characteristics from its electrical counterpart, and by changing the relative orientation of both magnetizations, it can change its magnitude even sign. The current-induced spin transfer torque (CISTT) is uncovered to be greatly enhanced when the bias voltage meets with the discrete levels of the QD at resonant positions. The relationship between the CISTT, the electrical current and the spin current is also addressed.

21 pages, 8 figures

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Cited by in corpus (16)

• Spin effects in single electron tunneling
• Magnetoresistance of a quantum dot with spin-active interfaces
• Transport through a double quantum dot system with non-collinearly polarized leads
• Cotunneling through quantum dots coupled to magnetic leads: zero-bias anomaly for non-collinear magnetic configurations
• Magnetotransport through graphene spin valves
• Gate voltage controlled electronic transport through a ferromagnet/normal/ferromagnet junction on the surface of a topological insulator
• Exchange effects on electron transport through single-electron spin-valve transistors
• Spin-dependent transport for armchair-edge graphene nanoribbons between ferromagnetic leads
• Spin current and polarization reversal through a single-molecule magnet with ferromagnetic electrodes
• Magneto-transport in impurity-doped few-layer graphene spin valve
• Spin transport properties of a quantum dot coupled to ferromagnetic leads with noncollinear magnetizations
• Quantum Oscillations of Tunnel Magnetoresistance Induced by Spin-Wave Excitations in Ferromagnet-Ferromagnet-Ferromagnet Double Barrier Tunnel Junctions
• Optimal Single Quantum Dot Heat-to-pure-spin-current Converters
• Gate-dependent spin-torque in a nanoconductor-based spin-valve
• Spin transfer in a ferromagnet-quantum dot and tunnel barrier coupled Aharonov-Bohm ring system with Rashba spin-orbit interactions
• Angle Selective Piezoelectric Strain Controlled Magnetization Switching in Artificial Spin Ice Based Multiferroic System