Magnetic and structural investigation of Mn(2+)-doped ZnSe semiconductor nanoparticles.
X-ray magnetic circular dichroism (XMCD) experiments on diluted magnetic semiconductor nanocrystals were carried out to study the local electronic structure and magnetic properties of Mn(2+) embedded in the lattice of ZnSe nanoparticles. It is shown that Mn(2+) is exclusively present in the bulk of ZnSe nanoparticles. Neither Mn-Mn coupling nor traces of oxidation to higher Mn oxidation states was observed. This result, which is consistent with EPR spectroscopic data, provides clear proof of the location of Mn(2+) in semiconductor nanoparticles. Further, it is shown that the magnetic ions are highly polarised inside the nanocrystals, where they reach about 50 % of the theoretical value of a pure d(5) state under identical conditions.
Physikalische und Theoretische Chemie, Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr 3, 14195, Berlin, Germany.
Andreas
A
Hofmann
Christina
C
Graf
Christine
C
Boeglin
Eckart
E
Rühl