Journal
APPLIED PHYSICS LETTERS
Volume 81, Issue 12, Pages 2217-2219Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1508168
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Monte Carlo simulations using a three-dimensional lattice model studied the Ruderman-Kittel-Kasuya-Yosida (RKKY) indirect exchange interaction of doped magnetic Co ions in ZnO films. The results of the calculations show that the RKKY interaction in Co-doped ZnO is long ranged and its magnitude is proportional to R-1 (inverse of the distance R from a central Co2+ ion). The sign oscillates with a frequency that depends on the concentration of the carrier. The long-distance sum of the RKKY indirect exchange energies is positive indicating that these materials are ferromagnetic, in direct correlation with previously reported results. (C) 2002 American Institute of Physics.
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