Spin transport properties of a quantum dot coupled to ferromagnetic leads with noncollinear magnetizations

Details Spin transport properties of a quantum dot coupled to ferromagnetic leads with noncollinear magnetizations Spin transport properties of a quantum dot coupled to ferromagnetic leads with noncollinear magnetizations

2008-11-24

arxiv.org/abs/0811.3800v4

J. Phys.: Condens. Matter 21 (2009) 155501

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 4 figures; some parts of the text has been revised in this version accepted by J. Phys.: Condens. Matter

Scientific paper

10.1088/0953-8984/21/15/155501

A correct general formula for the spin current through an interacting quantum dot coupled to ferromagnetic leads with magnetization at an arbitrary angle $\theta$ is derived within the framework of the Keldysh formalism. Under asymmetric conditions, the spin current component J_{z} may change sign for $0<\theta<\pi$. It is shown that the spin current and spin tunneling magnetoresistance exhibit different angle dependence in the free and Coulomb blockade regimes. In the latter case, the competition of spin precession and the spin-valve effect could lead to an anomaly in the angle dependence of the spin current.

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