1. Fert Beijing Institute BDBC School of Microelectronics Beihang University Xueyuan Road 37 Beijing 100191 China
2. Institute of Physics, station 3 Ecole Polytechnique Fédérale de Lausanne 1015 Lausanne‐EPFL Switzerland
3. Robinson Research Institute Victoria University of Wellington P.O. Box 600 Wellington 6140 New Zealand
4. The MacDiarmid Institute for Advanced Materials and Nanotechnology Wellington 6140 New Zealand