[1
]Department of Physics and Astronomy and Photon Science Institute, The University of
Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
[2
]Nano Engineering and Spintronic Technologies Group, Department of Computer Science,
The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
[3
]The Cockcroft Institute, Sci-Tech Daresbury, Keckwick Lane, Daresbury, Warrington
WA4 4AD, United Kingdom