Neutron Irradiation of LPE Bubble Domain Garnets

Five LPE iron garnets were irradiated in two steps to a total of 2 × 1015 n/cm2 (En > 10 keV). Samples included GdEr‐, GdY‐, GdYTm‐, GdYYb‐ and GdYLa‐IG's. Pre‐ and post‐irradiation measurements were made of ℓ, 4πMs, Ho, Hk and μw. A pre‐irradiation simulation of ambient reactor conditions showed that the properties were not affected by these influences. Post‐irradiation measurements revealed that negligible changes in properties had occurred. The estimated number of point defects produced in the samples is ∼ 1/10 of what would be required to cause threshold of damage property changes.