Iron garnets also attract a large amount of attention because of the high figure of merit of MO properties. Furthermore, based on the availability of low-damping iron garnet waveguides, many spin-wave-based analogue signal processing devices have been developed. In addition, the production of spin-wave waveguides composed of thin-film YIG having high quality makes it possible for spin waves and spin-wave dynamics to be studied. Therefore, because of their unique linear and nonlinear spin-wave dynamics, these materials have been widely used as microwave devices such as high- Q microwave oscillators, filters, generators, and power limiters) 6, 7. Moreover, this ferrimagnetic insulator has the narrowest known line of ferromagnetic resonance (FMR), resulting in a magnon lifetime of a few nanoseconds 4. In particular, yttrium iron garnet Y 3Fe 5O 12 (YIG) exhibits low spin-wave damping, leading to spin-wave propagation with over centimeter distances 3, 4, 5. Iron garnet materials have been extensively utilized in magneto-optical (MO) devices because of their high thermal strength, high Verdet constants, and low optical absorption coefficient 1, 2. These analyses at the atomic scale provide important guidance for optimizing MO functional materials. Furthermore, the formation of APBs can be eliminated by optimizing the growth rate, thus contributing to the enhanced MO performance. In particular, the segregation of oxygen deficiencies across the APBs directly leads to reduced magnetic elements, further decreases the magnetic moment of Fe and results in a higher absorption coefficient close to the APBs. We reveal that magnetic signals decrease in the regions close to APBs, which implies degraded MO performance.

Here, by analyzing the structure and magnetic properties, two different antiphase boundaries (APBs) with individual interfacial structure are investigated in substituted iron garnet film.

The adjustment on synthesis always induces structural variation, which is underestimated due to the limited knowledge of the local structures.

The ferrimagnetic insulator iron garnets, tailored artificially with specific compositions, have been widely utilized in magneto-optical (MO) devices.

Iron atomic radius