Anisotropy Fields on Implanted (100) Magnetic Garnet LPE Films

LPE-grown (100) magnetic garnet films were implanted with He⁺ ions under different conditions and annealed at 300°C, and the effect on the anisotropy field was studied. The field Hk1 for implanted layers was less than half that of unimplanted films, and decreased with increasing temperature; the change in effective anisotropy field ¿(Hk-4¿Ms) related to the magnetostriction constant ¿100 is large at high temperatures. The temperature characteristic of change in effective anisotropy field ¿(Hk-4¿Ms) exhibits an anomalous shift near Tc, which cannot be explained via a simple magnetostriction model.