Preparation and Properties of Thin Ferrite Films

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Abstract
Thin films of ferrites, of the order of 1000 A thickness, have been prepared by vacuum evaporation of the metals, and subsequent high-temperature oxidation. Films of iron, nickel, cobalt, magnesium, and copper ferrites, mixed ferrites, and mixed ferrite-aluminates, as well as yttrium iron garnet, have been prepared. X-ray powder diffractometry indicates that the ferrite films are single-phase spinels, while the garnet shows the garnet structure. In many respects, the properties of the films are the same as those of bulk ferrites of similar composition. The resistivity of the films can be controlled by proper oxidizing procedures. X-band magnetic resonance measurements indicate that the saturation magnetizations of the films are comparable to those of the corresponding bulk ferrites, though the films show larger resonance linewidths. It has been possible to prepare magnesium ferrite films with magnetizations from 2200 gauss to less than 500 gauss by proper annealing and quenching. The possible advantages of thin films are that they allow optical studies of the material by transmission, and should permit determination of magnetic exchange constants through observation of spin wave resonances.

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