Prediction of ferromagnetic (Zn,Mn)Se superlattice

We have studied the magnetic properties of Zn1-xMnxSe in the case of x = 0. 5, 0.25 by using a FLAPW method with super-cells. The anti-ferromagnetic st ates are stable upon electron and hole-doping up to 0.4 per Zn0.5Mn0.5Se. B ecause the anti-ferromagnetic super-exchange interaction in Mn-Se-Mn direct bonds overcome the double exchange interaction caused by the mobile Mn-3d electrons and holes. In order to stabilize the ferromagnetic states, we hav e proposed a new guideline to reduce the anti-ferromagnetic Mn-Se-Mn intera ction with reducing the number of the Mn-Se-Mn bonds by choosing the specia l superlattice configuration for Zn0.75Mn0.25Se. We proposed the materials design to fabricate the ferromagnetic Zn1-xMnxSe superlattice based upon th e calculation. (C) 2001 Elsevier Science B.V. All rights reserved.