1. Chemical
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
2. Material
Science and Engineering Division, Stanford University, Stanford, California 94305, United States
3. Peter-Grünberg-Institut-6, Forschungszentrum Jülich, 52425 Jülich, Germany
4. Advanced
Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
5. Materials
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States