J. M. Lucy,1 A. J. Hauser,2 Y. Liu,3 H. Zhou,4 Y. Choi,4 D. Haskel,4 S. G. E. te Velthuis,3 and F. Y. Yang1,* 1Department of Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus, Ohio 43210, USA 2California Nanosystems Institute, Elings Hall, University of California, Santa Barbara, California 93106, USA 3Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA 4Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA (Received 5 January 2015; revised manuscript received 12 February 2015; published 16 March 2015)