1. Seagate Technology, 1 Disc Drive, Springtown
Ind Estate, Londonderry BT48 0BF, United Kingdom
2. Department of Physics & Astronomy, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
3. Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
4. Department of Materials Science and Engineering, National Chung Hsing University, Taichung 402, Taiwan