Preparation and magneto-optical property of highly-resistive (Ga,Fe)As epilayers

Preparation of (Ga,Fe)As has been studied systematically by molecular beam epitaxy for a wide range of substrate temperature T-s. It has been found th at the physical properties of the epilayers can be classified into two diff erent types depending on the T-s. Epitaxy at relatively low T-s ( T-s = 260 degreesC) has yielded homogeneous, paramagnetic Ga1-xFexAs epilayers, wher eas epitaxy at higher temperatures (T-s = 350-580 degreesC) has resulted in GaAs epilayers with ferromagnetic inclusions. The layers prepared at high T-s have exhibited magneto-optical effect with ferromagnetic characteristic s. (C) 2001 Elsevier Science B.V. All rights reserved.