Stoichiometric growth of high Curie temperature heavily alloyed GaMnAs
- 12 May 2008
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 92 (19), 192502
- https://doi.org/10.1063/1.2927481
Abstract
Heavily alloyed, 100 nm Ga 1 − x Mn x As ( x > 0.1 ) films are obtained via low-temperature molecular beam epitaxy by utilizing a combinatorial technique which allows systematic control of excess arsenic during growth. Reproducible electronic, magnetic, and structural properties are optimized in a narrow range of stoichiometric growth conditions. In contrast to a prediction of the Zener model of hole-mediated ferromagnetism, the Curie temperature of the stoichiometric material is independent of x (for x > 0.1 ), while substitutional Mn content is proportional to x within a large window of growth conditions.Keywords
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