CoF(~204and COl.80MnO.lsFel.os04 spinels were prepared as thjn films. The as-deposited films were crystallized by conventional treatment (CT) and by rapid thermal annealing (RT A). The magneto-optical (MO) properties of oxides films were studied in relation with their thermal history. Between 600 and 800 nm the Faraday effect of RTA samples were different from those of CT films because the RTA process modified the cationic distribution of oxides and particularly the distribution of C02+ ions on the sites of the spinel structure. We put the structural changes to advantage in order to optimize the MO properties of Mn-Fe cobaltites at 690 nm.
To find a way to control the compositional change in Bi-substituted garnet during sputtering, we studied the effects of controlling the cathode magnetic field. The magnetic-field-controlled rf magnetron sputtering method that we developed can create a garnet film whose composition is the same as that of the sputtering target. When we deposited a film of Bi-substituted Dy iron garnet–ferrite (Bi2DyFe4GaO12) by this method, there was no compositional change between the target and the film even after a long sputtering process. Therefore, this sputtering method is effective at suppressing compositional change during the film formation process.
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