[1] Victoria Univ Wellington, Sch Chem & Phys Sci, Wellington 6012, New Zealand
[2] Victoria Univ Wellington, MacDiarmid Inst Adv Mat & Nanotechnol, Wellington 6012, New Zealand
[3] Ind Res Ltd, Lower Hutt 5040, New Zealand
[4] MacDiarmid Inst Adv Mat & Nanotechnol, Lower Hutt 5040, New Zealand
[5] Malaghan Inst Med Res, Wellington 6012, New Zealand
[6] CNRS, Inst Neel, Grenoble, France
[7] UJF, Grenoble, France
[8] Wellington Hosp, Dept Radiol, Wellington 6021, New Zealand
[9] Chang Gung Mem Hosp, Kaohsiung Med Ctr, Ctr Translat Res Biomed Sci, Kaohsiung 833, Taiwan
[10] Natl Cheng Kung Univ, Dept Chem, Tainan 701, Taiwan
[11] Natl Cheng Kung Univ, Ctr Micronano Technol Res, Tainan 701, Taiwan
[12] Stanford Synchrotron Radiat Lightsource, SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA