[1] Vienna Tech Univ, Inst Expt Phys, A-1040 Vienna, Austria
[2] Univ Ensieg LEG, St Martin Dheres, France
[3] Magnetfabr Schramberg, Schramberg Sulgen, Germany
[4] VAC, Hanau, Germany
[5] CNRS, Grenoble, France
[6] Hirst Magnet Instr, Cornwall, England