Premium
Spin‐polarized charge transport through ionic clusters of magnetic oxides
Author(s) -
Gehring G. A.,
LehmannSzweykowska A.,
Wojciechowski R. J.,
Wigen P. E.,
Micnas R.
Publication year - 2006
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.200562451
Subject(s) - condensed matter physics , ionic bonding , magnetoresistance , heterojunction , doping , anisotropy , fermi level , materials science , ion , chemistry , valence (chemistry) , electron , magnetic field , physics , organic chemistry , quantum mechanics
We analyze the spin‐controlled charge transfer through a heterostructure consisting of one octahedral and one tetrahedral iron–oxygen ionic clusters, which are site‐coupled, sharing an oxygen ion. A number of charge carriers can be manipulated by valence‐uncompensated doping. The electron‐energy structure of the clusters and that of the heterostructure are found on the basis of the Anderson model. Current–voltage ( I–V ) characteristics, derived from the Landauer‐like formula, turn out to be highly sensitive to the position of the Fermi level. We also calculated the magnetoresistance for the heterostructure with different orientations of the magnetic field. The result confirmed the empirical data for Ca:YIG, which indicate strong anisotropy of the magnetoresistance. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)