Magnetoreflectance and magnetization of the semimagnetic semiconductorZn1−xFexSe

Abstract

Magnetoreflectance measurements of excitonic interband transitions are used to study the exchange interaction between band electrons and localized Fe d electrons in cubic ${\mathrm{Zn}}_{1\mathrm{-}\mathit{x}}$ ${\mathrm{Fe}}_{\mathit{x}}$Se (x<0.06) at T=1.9 K and B<5 T. Combining exciton splitting with the magnetization of the same samples, we determined the conduction- and valence-band exchange constants ${\mathit{N}}_0$α=0.25 eV and ${\mathit{N}}_0$β=-1.76 eV.