Title :
Determination of Mn Acceptor Compensation in MBE-Grown GaMnAs via Magnetic Circular Dichroism (MCD)
Author :
Chakarvorty, Raja ; Zhou, Ying-Yuan ; Cho, Yong-Jin ; Liu, Xinyu ; Jakiela, Rafal ; Barcz, Adam ; Furdyna, Jacek K. ; Dobrowolska, Malgorzata
Author_Institution :
Dept. of Phys., Notre Dame Univ., IN
fDate :
6/1/2007 12:00:00 AM
Abstract :
In order to investigate the origin of the magnetic circular dichroism (MCD) in Ga1-xMnx As, we prepared a series of paramagnetic samples with a very low Mn content (x~0.0005 and 0.0003), grown at different substrate temperatures. The samples grown at low temperatures (< 300 degC) show a sign change in the MCD, while those grown at higher temperatures (>300degC) reveal broad positive MCD spectra similar to those observed in ferromagnetic Ga1-xMnxAs. In addition, samples grown at high temperature ( ~600 degC) but with Si co-doping show a behavior typical to samples grown at low substrate temperatures, namely sign changing MCD spectra. Our results indicate that the negative component of the MCD does not originate from the interband transitions but from transitions involving ionized Mn acceptors
Keywords :
III-V semiconductors; Zeeman effect; antisite defects; doping profiles; ferromagnetic materials; gallium arsenide; magnetic circular dichroism; manganese compounds; molecular beam epitaxial growth; semiconductor doping; semimagnetic semiconductors; GaMnAs:Si; MBE; MCD spectra; Zeeman splitting; antisite; doping; ferromagnetic materials; magnetic circular dichroism; magnetic semiconductor; paramagnetic samples; Absorption; Antiferromagnetic materials; Gallium arsenide; Magnetic properties; Magnetic semiconductors; Molecular beam epitaxial growth; Paramagnetic materials; Physics; Substrates; Temperature distribution; Arsenic antisite; GaMnAs, magnetic circular dichroism; Zeeman splitting; ferromagnetism; magnetic semiconductor;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2007.894343
