Magnetooptic properties of Fe/polydiphenylenephthalide/Fe thin-film systems

Currently, electrically conductive polymers created at the end of the 20th century attract the attention of researchers due to the variety of their mechanical and optical properties, as well as their high conductivity. The most noteworthy polymer is polydiphenylenephthalide - PDP. An analysis of the existing data has shown that by now quite a lot of information has been obtained on the physical properties of PDP samples, but there are practically no data on the effect of the polymer, which is part of composite multilayer magnetic systems, on their magneto-optical properties. In addition, of particular interest is the study of the previously unexplored spectral dependences of the equatorial Kerr effect (TKE) for three-layer Fe/PDP/Fe systems, which can be used to obtain information about the electronic and magnetic structure of the samples. It should be noted that the magnetic characteristics and features of the magnetic field behavior of Fe/PDP/Fe systems were studied and published by the authors of this work earlier in the journal Solid State Physics, volume 60, issue № 9., P. 1693. At the same time, the magnetooptical properties of these systems have practically not been studied. Taking this fact into account, the present work is devoted to the magneto-optical study of three-layer Fe/PDP/Fe low-dimensional thin-film magnetic systems. This paper presents for the first time the results of a study of the magneto-optical properties of three-layer Fe/PDP/Fe low-dimensional thin-film magnetic systems. The measurements were made on a magneto-optical magnetometer using the equatorial Kerr effect. It is found that the values of the saturation field observed for the studied thin-film systems depend on the thickness of both the iron layer and the PDP layer. This fact is explained by the interaction of ferromagnetic layers with PDP layers. It is found that the shape of the spectral dependences of the equatorial Kerr effect observed for Fe/PDP/Fe thin-film systems with an iron thickness of 30 nm is similar to the magneto-optical spectra found for ferromagnetic films. At the same time, the magnitude of the magneto-optical effect depends on the thickness of the PDP layer; in particular, it decreases with an increase in the thickness of the PDP layer. This fact is explained by the decrease in the influence of the ferromagnetic metal layer on the magneto-optical signal with an increase in the thickness of the non-ferromagnetic layer.