Journal
JOURNAL OF APPLIED PHYSICS
Volume 91, Issue 10, Pages 7487-7489Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1447199
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We have studied transmission magneto-optical spectra of (GaMn)As/AlAs ultrathin heterostructures. In the heterostructures whose (GaMn)As thickness d is thinner than 5 nm, the magneto-optical spectra are significantly blueshifted with the decrease of d, whereas the heterostructures with thicker (GaMn)As (>12 nm) show magneto-optical spectra similar to that of bulk (GaMn)As, and the mechanisms of the blueshift are discussed. Furthermore, we have observed ferromagnetic ordering even in the ultrathin (GaMn)As (d=2 and 5 nm) samples with their transition temperature of 70 K. (C) 2002 American Institute of Physics.
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