Epitaxial growth of the diluted magnetic semiconductors Cr[sub y]Ge[sub 1-y] and Cr[sub y]Mn[sub x]Ge[sub 1-x-y]

Kioseoglou, G.; Hanbicki, A. T.; Li, C. H.; Erwin, S. C.; Goswami, R.; Jonker, B. T.
March 2004
Applied Physics Letters;3/8/2004, Vol. 84 Issue 10, p1725
Academic Journal
We report the epitaxial growth of Cr[sub y]Ge[sub 1-y] and Cr[sub y]Mn[sub x]Ge[sub 1-x-y](001) thin films on GaAs(001), describe the structural and transport properties, and compare the measured magnetic properties with those predicted by theory. The samples are strongly p type, and hole densities increase with Cr concentration. The Cr[sub y]Ge[sub 1-y] system remains paramagnetic for the growth conditions and low Cr concentrations employed (y≤0.04), consistent with density functional theory predictions. Addition of Cr into the ferromagnetic semiconductor Mn[sub x]Ge[sub 1-x] host systematically reduces the Curie temperature and total magnetization. © 2004 American Institute of Physics.


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