%0 Journal Article
%A Picozzi, S.
%A Lezaic, M.
%A Blügel, S.
%T Electronic structure and exchange constants in magnetic semiconductor digital alloys: chemical and band-gap effects
%J Physica status solidi / A
%V 203
%@ 0031-8965
%C Weinheim
%I Wiley-VCH
%M PreJuSER-52861
%P 2738 - 2745
%D 2006
%Z Record converted from VDB: 12.11.2012
%X First-principles simulations have been performed for [001]-ordered Mn/Ge and Mn/GaAs "digital alloys", focusing on the effects of (i) a larger band-gap and (ii) a different semiconducting host on the electronic structure of the magnetic semiconductors of interest. Our results for the exchange constants in Mn/Ge, evaluated using a frozen-magnon scheme, show that a larger band-gap tends to give a stronger nearest-neighbor ferromagnetic coupling and an overall enhanced in-plane ferromagnetic coupling even for longer-ranged coupling constants. As for the chemical effects on the exchange constants, we show that Mn/GaAs shows a smaller nearest-neighbor ferromagnetic coupling than Mn/Ge, but exchange constants for higher Mn-Mn distance show an overall increased ferromagnetic behavior in Mn/GaAs. As a result, from the magnetic-coupling point of view, the two systems behave on average rather similarly. (c) 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000240849800033
%R 10.1002/pssa.200669574
%U https://juser.fz-juelich.de/record/52861