Magneto-optical properties of granular AgCo films

Ag1-xCox alloy films were prepared by RF magnetron sputtering onto glass substrate. And the samples were annealed at 200 degrees C and 400 degrees C AgCo films with Co contents below 32 at percent are generally superparamagnetic in their as-deposition state. The fraction of Co atoms in the ferromagnetic component increases monotonically with increasing annealing temperature (Ta) and/or at percent Co. The (theta) k also increase, but for the Co contents above 45 at percent, as the Ta increase, the (theta) k increase slowly. For Ag55Co45 (theta) k equals 0.08 degrees, reflection (R) equals 0.90 and Hc equals 2000 Oe, and for Ag50Co50 (theta) k equals 0.10 degrees, R equals 0.85 and Hc equals 2500 Oe are obtained. We found that most film's magnetic hysteresis loops with applied external field H normal to film surface and in film plane are similar. We analyzed these phenomenon according to the film's structure.