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Coherent electronic transport through magnetic junction
Author(s) -
Lipiński S.,
Bułka B. R.,
Babiaczyk W.
Publication year - 2003
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200301679
Subject(s) - condensed matter physics , magnetoresistance , ferromagnetism , valence (chemistry) , conductance , quantum dot , kondo effect , physics , antiparallel (mathematics) , materials science , magnetic field , electrical resistivity and conductivity , quantum mechanics
A quantum dot with a single energy level coupled to ferromagnetic electrodes is considered within the slave boson approach. Magnetic polarisation of the leads induces the spin accumulation at the dot. Its maximum occurs in the mixed valence range and decreases to zero in the Kondo regime. We have calculated the conductance for parallel and antiparallel orientations of polarisation of electrodes. Magnetoresistance takes the largest values in the empty state regime, considerably decreases in mixed valence range and reaches the smallest values in the Kondo regime, where in some cases even negative magnetoresistance can occur.