TEMPERATURE-DEPENDENCE OF THE MAGNETIC COMPTON PROFILE OF FERRIMAGNETIC HOFE2

Circularly polarised synchrotron radiation has been used to measure th e spin-dependent magnetic Compton profile of the ferromagnet HoFe2 at six temperatures from 10 K to 300 K. The magnetic Compton profiles hav e been analysed using appropriate free atom Compton profiles and a fre e electron Compton profile which has allowed the determination of the individual spin moments on the Ho and Fe sites and the diffuse moment; the last two are, to a first approximation, temperature independent. The Ho moment, which is antiferromagnetically coupled to them, reduces by a factor of two across the temperature range, leading to a spin co mpensation temperature of 210 +/- 10 K. The experiments were performed with 45.9 keV photons at the KEK ARNE-1 station of the Accumulation R ing.