[1] Univ Basel, Dept Phys, Klingelbergstr 82, CH-4056 Basel, Switzerland
[2] Norwegian Univ Sci & Technol NTNU, Dept Phys, Ctr Quantum Spintron, Hogskoleringen 5,Realfagbygget D5-170, N-7491 Trondheim, Norway
[3] ETH, Lab Organ Chem, Vladimir Prelog Weg 3, CH-8093 Zurich, Switzerland
[4] Univ Groningen, Zernike Inst Adv Mat, Nijenborgh 4, NL-9747 AG Groningen, Netherlands
[5] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201204, Peoples R China
[6] Paul Scherrer Inst, Lab Micro & Nanotechnol, CH-5232 Villigen, Switzerland
[7] Empa, Swiss Fed Labs Mat Sci & Technol, Uberlandstr 129, CH-8600 Dubendorf, Switzerland
[8] Lund Univ, MAX IV Lab, POB 118, S-22100 Lund, Sweden
[9] Univ Estadual Campinas, Inst Fis Gleb Wataghin, Dept Fis Aplicada, BR-13083859 Campinas, SP, Brazil
[10] Paul Scherrer Inst, Lab Synchrotron Radiat Condensed Matter, CH-5232 Villigen, Switzerland
[11] Univ Belgrade, Fac Phys Chem, Studentski Trg 12-16, Belgrade 11158, Serbia
[12] KTH Royal Inst Technol, Dept Mat Sci & Engn, Brinellvagen 23, S-10044 Stockholm, Sweden
[13] Uppsala Univ, Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden