Physics – Condensed Matter
Scientific paper
2002-04-11
Phys. Rev. B 66, 012408 (2002)
Physics
Condensed Matter
8 pages, 4 figures, submitted for Rapid Communication in Phys Rev B
Scientific paper
10.1103/PhysRevB.66.012408
We examine the Mn concentration dependence of the electronic and magnetic properties of optimally annealed Ga1-xMnxAs epilayers for 1.35% < x < 8.3%. The Curie temperature (Tc), conductivity, and exchange energy increase with Mn concentration up to x ~ 0.05, but are almost constant for larger x, with Tc ~ 110 K. The ferromagnetic moment per Mn ion decreases monotonically with increasing x, implying that an increasing fraction of the Mn spins do not participate in the ferromagnetism. By contrast, the derived domain wall thickness, an important parameter for device design, remains surprisingly constant.
Chun Sae Hwan
Ku K. C.
Mahendiran R.
Potashnik S. J.
Samarth Nitin
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