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24 April 2024 |
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Antisite effect on ferromagnetism in (Ga,Mn)As | | R. C. Myers
; B. L. Sheu
; A. W. Jackson
; A. C. Gossard
; P. Schiffer
; N. Samarth
; D. D. Awschalom
; | | Date: |
19 Jun 2006 | | Subject: | Materials Science | | Abstract: | We study the Curie temperature and hole density of (Ga,Mn)As while systematically varying the As-antisite density. Hole compensation by As-antisites limits the Curie temperature and can completely quench long-range ferromagnetic order in the low doping regime of 1-2% Mn. Samples are grown by molecular beam epitaxy without substrate rotation in order to smoothly vary the As to Ga flux ratio across a single wafer. This technique allows for a systematic study of the effect of As stoichiometry on the structural, electronic, and magnetic properties of (Ga,Mn)As. For concentrations less than 1.5% Mn, a strong deviation from Tc ~ p^0.33 is observed. Our results emphasize that proper control of As-antisite compensation is critical for controlling the Curie temperatures in (Ga,Mn)As at the low doping limit. | | Source: | arXiv, cond-mat/0606488 | | Services: | Forum | Review | PDF | Favorites | |
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