METHOD OF PRODUCING EPITAXIAL FILMS OF FERRO-GARNETS WITH HIGH SPECIFIC FARADAY ROTATION Russian patent published in 2025 - IPC C30B19/02 C30B19/12 C30B29/28 H01F10/24 G02F1/09 

FIELD: chemistry.

SUBSTANCE: invention relates to the technology of producing epitaxial films of ferro-garnets and can be used in magneto-optics, spintronics and magnonics. First, a mixture is prepared, consisting of a mechanical mixture of garnet-forming oxides, polycrystalline ferro-garnet and solvent oxides, which are represented by oxides of lead, boron and bismuth: PbO, B₂O₃, Bi₂O₃, taken in mol.% ratio PbO+B₂O₃/Bi₂O₃=1.9±0.2. Polycrystalline component used is bismuth-substituted ferro-garnet with bismuth content less than the limit of thermodynamic stability of ferro-garnet. Then said components are melted and solution-melt is homogenised at temperature of 1365-1375 K for 3-4 hours. Temperature of the solution-melt is reduced to a saturation point and epitaxial films are grown on a substrate of gadolinium-gallium garnet Gd₃Ga₅O₁₂ with orientation of 100.

EFFECT: obtained epitaxial films of bismuth-substituted ferro-garnets have a defect-free crystalline structure and are characterized by high specific Faraday rotation – up to 8⋅10⁴ deg/cm, at content of bismuth is less than limit of thermodynamic stability of ferro-garnet.

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