Abstract
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.
Highlights
Epitaxial yttrium iron garnet (YIG)/gadolinium gallium garnet (GGG) films are widely used as material for magnetic spin waves generation in microwave techniques in the frequency range of 1081011 Hz and for magnetical and optical applications as modulators, analyzers, correlators, deflectors [1]
The aim of this work is the investigation of epitaxial YIG/GGG films domain structure and its dependence on the external magnetic field and films thickness
Another task is to find the relationship between the magnetic microstructure parameters and the domain structure of films with different thicknesses using Mössbauer spectroscopy
Summary
Epitaxial YIG/GGG films are widely used as material for magnetic spin waves generation in microwave techniques in the frequency range of 1081011 Hz and for magnetical and optical applications as modulators, analyzers, correlators, deflectors [1]. The high performance of materials practical application involves the minimizing of electromagnetic waves extinction with high magnetic Q-factor. The solution of this problem involves the YIG magnetic properties understanding especially its domain structure transformation with external influences. The aim of this work is the investigation of epitaxial YIG/GGG films domain structure and its dependence on the external magnetic field and films thickness. Another task is to find the relationship between the magnetic microstructure parameters and the domain structure of films with different thicknesses using Mössbauer spectroscopy
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