Abstract
The interactions of spin angular momentum and the external magnetic field in a quantum dot coupled to ferromagnetic lead have been considered here. The results show that the magnetic moment of spin precession caused by the direction of the external field changing could be used to adjust the coulomb gaps of quantum dots, and to control thermal-to-electron conversion efficiency or thermal-to-spin transformation efficiency. When the polarized directions of the ferromagnetic leads are opposite, it is possible to obtain a better thermal spin quality factor. So the system symmetry and Coulomb blockade effect limit the spin current of a quantum dot system. Our results are important to the design of quantum dot devices.
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