Abstract
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 Co 2+ 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.
Original language | English |
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Pages (from-to) | 2217-2219 |
Number of pages | 3 |
Journal | Applied Physics Letters |
Volume | 81 |
Issue number | 12 |
DOIs | |
State | Published - Sep 16 2002 |