Spin Filter, Spin Amplifier and Other Spintronic Applications in Graphene Nanodisks

Abstract

Graphene nanodisk is a graphene derivative with a closed edge. The trigonal zigzag nanodisk with size $N$ has $N$-fold degenerated zero-energy states. A nanodisk can be interpletted as a quantum dot with an internal degree of freedom. The grand state of nanodisk has been argued to be a quasi-ferromagnet, which is a ferromagnetic-like states with a finite but very long life time. We investigate the spin-filter effects in the system made of nanodisks and leads based on the master equation. The finite-size effect on spin filter is intriguing due to a reaction from the polarization of incoming current to a quasi-ferromagnet. Analyzing the relaxation process with the use of the Landau-Lifshitz-Gilbert equation, we explore the response to four types of incoming currents, namely, unpolarized current, perfectly polarized current, partially polarized current and pulse polarized current. We propose some applications for spintronics, such as spin memory, spin amplifier, spin valve, spin-field-effect transistor and spin diode.

10 pages, 10 figures

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Cited by in corpus (17)

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• Properties of Graphene: A Theoretical Perspective
• Efficient implementation of the nonequilibrium Green function method for electronic transport calculations
• Dual Spin Filter Effect in a Zigzag Graphene Nanoribbon
• Electronic properties of graphene and graphene nanoribbons with "pseudo-Rashba" spin-orbit coupling
• Graphene nanoflakes in external electric and magnetic in-plane fields
• Exact wave functions for an electron on a graphene triangular quantum dot
• I-V curve signatures of nonequilibrium-driven band gap collapse in magnetically ordered zigzag graphene nanoribbon two-terminal devices
• The RKKY Coupling between Impurity Spins in Graphene Nanoflakes
• Dirac Fermions in Graphene Nanodisk and Graphene Corner: Texture of Vortices with Unusual Winding Number
• Quasi-Ferromagnet Spintronics in Graphene Nanodisk-Lead System
• Graphene nanoring as a tunable source of polarized electrons
• Generation and Manipulation of Spin Current in Graphene Nanodisks: Robustness against Randomness and Lattice Defects
• Quasi-Phase Transition and Many-Spin Kondo Effects in Graphene Nanodisk
• Ground-state magnetic phase diagram of bow-tie graphene nanoflakes in external magnetic field
• Effective low-energy Hamiltonians for interacting nanostructures
• Magnetic, charge, and transport properties of graphene nanoflakes