Above-bandgap magneto-optical Kerr effect in ferromagnetic Ga1−xMnxAs

C. Sun,1,2,3 J. Kono,1,2,3,* Y.-H. Cho,4 A. K. Wójcik,4 A. Belyanin,4 and H. Munekata5 1Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, USA 2Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA 3The Richard E. Smalley Institute for Nanoscale Science and Technology, Rice University, Houston, Texas 77005, USA 4Department of Physics, Texas A&M University, College Station, Texas 77843, USA 5Imaging Science and Engineering Laboratory, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8503, Japan (Received 19 May 2010; revised manuscript received 4 February 2011; published 25 March 2011)