Abstract
Epitaxial yttrium-iron garnet (YIG) films with various thicknesses were fabricated on gadolinium-gallium garnet substrates by a metal–organic decomposition (MOD) method, and their dynamic and static magnetic properties were investigated. We varied the thickness of the YIG films by repeating spin-coating of the MOD solution and pre-annealing. The lattice constant and the crystal size of the YIG films were almost independent of the thickness (the coating count N). The damping factor and coercive field increased with N. Moreover, the saturation magnetization MS measured using a vibrating sample magnetometer increased with N, although that measured by ferromagnetic resonance was almost independent of N. Thus, both dynamic and static magnetic properties for the YIG films obviously degraded with increasing N. Judging from these results, the repetition of the coating process generates other ferromagnetic micro-crystalline phases at grain boundaries, for instance, γ-Fe2O3 and Fe3O4, which could cause degradation of the magnetic properties of the YIG films prepared by the MOD method.
Highlights
Magnons are one of the most expected candidates as information carriers for future low-consumption and high-speed computing systems
Since gadolinium-gallium garnet (GGG) substrates can be etched by thermal phosphoric acid, it is difficult to measure the thickness of a Yttrium-iron garnet (YIG) film prepared on a GGG substrate using this method, and we considered that the relation between film thickness and N for the YIG films prepared on GGG substrates is almost equal to one on SiO2/Si substrates
We investigated the dynamic and static magnetic properties of epitaxial YIG films with various thicknesses on the GGG substrates prepared by an metal–organic decomposition (MOD) method
Summary
Magnons are one of the most expected candidates as information carriers for future low-consumption and high-speed computing systems. Scitation.org/journal/adv achieving clear MO images.22,27,28 there are few investigations on the dynamic magnetic properties of RIG films prepared by an MOD method.23,29 In this study, we fabricated YIG films with various thicknesses on GGG substrates using an MOD method by repeating spin-coating and pre-annealing, and their static and dynamic magnetic properties were investigated and compared using a vibrating sample magnetometer (VSM) and a ferromagnetic resonance (FMR) method. Spin Seebeck effect.26 the static magnetic and MO properties have been widely investigated for various RIG films prepared by an MOD method.
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