S. Demuynck, J. Meersschaut, J. Dekoster, R. Moons, B. Swinnen, S. Cottenier, M. Rots Journal of Magnetism and Magnetic Materials 165 (1-3), 462-4641997A1Published while none of the authors were employed at the CMMDOI http://dx.doi.org/10.1016/S0304-8853(96)00592-6