Magnetisation of isolated single crystalline Fe-nanoparticles measured by a ballistic Hall micro-magnetometer L. Theil Kuhn, A. K. Geim, J. G.S. Lok, P. Hedegård, K. Ylänen, J. B. Jensen, E. Johnson and P. E. Lindelof Eur. Phys. J. D, 10 2 (2000) 259-263 Published online: 15 May 2000 DOI: 10.1007/s100530050547