1. Department of Physics and Astronomy; Vanderbilt University; Nashville TN 37235 USA
2. Department of Physics and Materials Science; University of Memphis; Memphis TN 38152 USA
3. SuperSTEM Laboratory; Daresbury WA4 4AD UK
4. Department of Materials; Oxford University; Parks Road Oxford OX1 3PH UK
5. Grupo de Fisica de Materiales Complejos; Universidad Complutense; 28040 Madrid Spain
6. Quantum Condensed Matter Division; Oak Ridge National Laboratory; Oak Ridge TN 37831 USA
7. Materials Science Division; Argonne National Laboratory; Argonne IL 60439 USA
8. Advanced Photon Source; Argonne National Laboratory; Argonne IL 60439 USA
9. Advanced Light Source; Lawrence Berkeley National Laboratory; Berkeley CA 94720 USA
10. Materials Science and Technology Division; Oak Ridge National Laboratory; Oak Ridge TN 37831 USA
11. Instituto de Magnetismo Aplicado; Universidad Complutense; 28040 Madrid Spain
12. Department of Electrical Engineering and Computer Science; Vanderbilt University; Nashville TN 37235 USA