The mechanism of the influence of crystal inhomogeneities on the magnetic and domain microstructures of functional materials based on yttrium iron garnet heterostructures is an important subject of investigation due to the aim to predict parameters for manufacturingpurposes. A study of the structural and magnetic characteristics of a set of yttrium iron garnet films grown on gadolinium–gallium garnet substrate is presented. High-resolution X-ray diffractometry, Mössbauer spectroscopy, MFM, as well as ion implantation simulation and X-ray diffraction simulation were used together to determine the features of the effect of Ne+ ion implantation with different dose rates on the samples. The simulation of ion implantation with E = 82 keV showed energy loss profiles of Ne ions with subsequent defect formation up to amorphization of near-surface layers at high doses. Implantation creates two magnetically non-equivalent types of tetrahedrally located Fe3+ ions, which leads to a rotation of the total magnetic moment relative to the film surface and a change in the width of the magnetic domain stripes.
A study on the influence of the composition of the model media of the soil electrolyte (NS1-NS2) on the corrosion rate of tubular steels 17G1S and 13G1S-U in a long-term experiment. The phase composition and structure of corrosion products were determined by X-ray analysis. using an X-ray diffractometer Shimadzu XRD-7000. It was found that, regardless of the steel grade, the composition of corrosion products in the environment of NS1 will be mainly characterized by the presence of lepidocrocite, and in the environment of NS2 -goethite. The corroding samples in both media will have a small amount of magnetite. During the exposure (609 days) of steel samples in the studied model media, the rate of corrosion processes depends on the component composition of the model media, steel grade and pH. The obtained results are important for predicting the behavior of underground pipelines in soils of different corrosive activity.
The Mossbauer studies of yttrium iron garnet (YIG) films grown on the gadolinium gallium garnet (GGG) substrate was realized for different films thickness (2.85 and 5.42 mm) at the applied external magnetic field. It is shown that the main changes in the magnetic microstructure of YIG/GGG films are occurred at magnetic field value up to 2.20 kOe. The changes of the hyperfine magnetic fields on the iron nuclei have been investigated and its isotropic component was analyzed. It was determined that the domain structure changes (in particular, the domains width enlarging) under the applied magnetic field increase with the film thickness decreasing.
Здійснено аналіз впливу умов росту на магнітну мікроструктуру та параметри напруженого стану епітаксійних плівок LaGa-заміщеного залізоітрієвого ґранату (ЗІҐ). Для незаміщеної плівки ЗІҐ/ҐҐҐ доведено наявність двох магнітонееквівалентних тетракоординованих позицій іонів
The article gives a literary review of the current state of research of ferrite-garnet films. The basic crystalline and magnetic characteristics of thin films of iron-yttrium garnet are considered. We analyzed the causes of the appearance of the labyrinth, stripe and cylindrical domain structure. It is shown that the domain structure of the yttrium iron garnet strongly depends on many parameters of the films, in particular on the thickness, structural perfection of the surface and the sample as a whole. The article reviews the most common methods of synthesis, ion implantation and post-growth treatment of ferrite-garnet films.The study of dependencies between the conditions of obtaining, the chemical composition, the posttreatment conditions, the defective structure and the magnetic properties of ferrite-garnet films have great practical value for obtaining films with predetermined properties.
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