MAGNETISM OF LIQUID-HE-3 UP TO 200-T

We report measurements of nuclear magnetism of degenerate liquid He-3 below 0.1K. Nuclear polarization up to 60% was transiently obtained by rapid melting of a 80% polarized He-3 solid. From simultaneous measur ements of the magnetization and of the heat released during the relaxa tion towards magnetic equilibrium, we deduce the magnetization depende nce of the free energy of the liquid, and hence the magnetization curv e up to 200 T. At 26 Bar and 80 mK, we find that the susceptibility de creases with increasing magnetization. This rules out any significant metamagnetism of the liquid, in contradiction with former expectations . In order to confirm this behaviour by a static experiment, we have d eveloped a torque magnetometer to carry out precision measurements of the equilibrium magnetization up to 30T (corresponding to a 12% polari zation) and at 50mK. Preliminary results of this experiment are report ed.