THE MAGNETIC-STRUCTURE OF ND6FE13SI

The magnetic structure of Nd6Fe13Si has been studied by magnetization measurement, the singular point detection technique and neutron powder diffraction. It was found that the Nd6Fe13Si is ferrimagnetic with a compensation temperature of 357 K and a Curie temperature of 441 K. Th e spontaneous magnetization values are 12.9 J T-1 kg-1 at 5 K and 7.4 J T-1 kg-1 at 300 K. There are two values B0cr1 and B0cr2 of the magne tic phase transition field below 225 K: B0cr1 = 6.2 T and B0cr2 = 8.2 T at 77 K and B0cr = 5.3 T at 300 K. The atomic magnetic moments are o rdered in an antiparallel manner, and the two magnetosublattices are M (I) up {8f(Nd), 161(Nd), 4d(Fe), 161(2)(Fe)) and M(II) down {16k(Fe), 161(1)(Fe)).