Affiliation: | 1. Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA;2. Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973-5000, USA;3. Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA;4. Department of Physics and Department of Chemistry, Ohio State University, Columbus, OH 43210, USA;5. Department of Physics, University of California Davis, Davis, CA 95616, USA;6. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;g San Jose Research Center, Hitachi Global Storage Technologies, San Jose, CA 95120, USA;h Department of Materials Science, University of Washington, Seattle, WA 98195, USA;i Physics Department, Carnegie Mellon University, Pittsburgh, PA 15213, USA;j Department of Physics, Carwell Hall, Kansas State University, Manhattan, KS 66506, USA;k Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;l Department of Physics, University of Illinois at Urbana-Champaign, 1110 W. Green Street, Urbana, IL 61801, USA;m Physics Department-0319, University of California—San Diego, La Jolla, CA 92093, USA;n Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, P. O. Box 2008, Oak Ridge, TN 37830-6164, USA;o IBM Research, 1101 Kitchawan Rd., Rt. 134, Yorktown Heights, NY 10598, USA |