Abstract
Using an equation of motion technique, we investigate the Kondo effectin a quantum dot coupled to ferromagnetic leads and a mesoscopic ring.It is shown that the Kondo resonance at the Fermi level of the dotpresents the periodic change along with the aggrandizement of themagnetic flux and the number of lattice sites NR in themesoscopic ring, and for the antiparallel spin alignment the Kondoresonances for spin-up and spin-down configurations appear at the sameposition. However, for the parallel spin alignment, the Kondo resonancesplits for the spin-up and spin-down configurations.
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