NI CONTAINING SOLID KR BUBBLES STUDIED WITH NEUTRON DEPOLARIZATION AND SMALL-ANGLE NEUTRON-SCATTERING

Neutron depolarization (ND) and small-angle neutron scattering (SANS) experiments on Ni containing solid Kr bubbles are presented and discussed. The aim of the measurements is to study the effect of the Kr bubbles on the local magnetization. For the first time ND measurements in relatively large fields up to 80 kA/m could be performed. However, the ND results do not yield information about the Kr bubbles. The SANS patterns at applied fields larger than 400 kA/m are isotropic and are in agreement with a high fraction of small (radius almost-equal-to 1.5 nm) Kr bubbles. Also a small fraction of larger (radius greater-than-or-similar-to 15 nm) Kr bubbles or other nuclear inhomogeneities is likely to be present. The magnetic scattering is in agreement with a local magnetization which is affected by the demagnetization fields of these inhomogeneities.