Abstract

Magnetic and diluted magnetic semiconductors (DMSs) enjoy continued interest and examination, principally because free carriers introduced by doping or optical excitation across the band gap couple strongly with the spins in the lattice. In metals, changes in carrier densities ordinarily do not lead to modification of magnetic behavior. In magnetic semiconductors, however, carriers may have a profound effect on the magnetic behavior, in some cases reversing the sign of the effective exchange interaction between ion spins.

© 1987 Optical Society of America