Abstract
Effect of the low symmetry crystal field S4 was investigated on the spectral shape of Faraday rotation in ferrites containing tetrahedral Co2+ ions.
The calculated shape of Faraday rotation in 4T1(4F) becomes broad with increasing α′, a parameter proportional to the magnitude of the low symmetry field (S4), above about 1000 cm -1 , and has a shoulder or other structure when α′ ≥ 2000 cm -1.
Using α′ = 2000 cm -1 explains well the broad shape of the experimentally observed Faraday rotation at about 1.5 μm in a (Y2.8Gd0.2)(Fe4.6Co0.2Ge0.2)O12 thin film grown by the conventional liquid phase epitaxy (LPE) method.
