4 results about "Yttrium iron garnet" patented technology

This invention discloses a method for preparing highly stable gyromagnetic ferrites, belonging to the field of magnetic material preparation technology. The method includes formulation preparation, multi-stage sand milling and granulation, molding and sintering, composite structure preparation, and precision machining steps. The formulation consists of VIII-series, IIIB-series, lanthanide-series, IVB-series, and VIIB-series metal oxides in a specific molar ratio, with rare earth nano-additives added to enhance lattice stability. Uniform slurry particle size is achieved through two-stage sand milling and spray granulation. A curved sintering process is used to control the temperature rise and oxygen content to obtain a high-density green body. A yttrium iron garnet or dysprosium iron garnet functional layer is formed on the surface of the green body by magnetron sputtering, constructing a multi-layer composite structure. Finally, a conductive modification layer is formed on the surface through integrated laser cutting and chemical mechanical polishing. The gyromagnetic ferrite material prepared by this method exhibits high saturation magnetization, low high-frequency loss, and excellent thermal stability, making it suitable for 5G communication, radar, and high-frequency microwave devices.

This invention discloses a photonic crystal structure with multiple types of topological edge states and its implementation method, belonging to the field of photonic crystal and topological photonics technology. The photonic crystal consists of a triangular lattice structure composed of multiple sets of lattice units with a lattice constant of . Each set of lattice units includes multiple sub-lattice units composed of yttrium iron garnet magneto-optical pillars and NdFeB permanent magnets at their upper and lower ends. The sub-lattice units are uniformly distributed in a polygonal pattern, with their circumferential spacing divided into two groups: one group shrinks inward along the center of the sub-lattice, and the other group expands outward along the center of the sub-lattice, forming two nested triangular lattice structures. This structure, through the coordinated design of magnetization direction and lattice structure symmetry, simultaneously breaks the time-space inversion symmetry, achieving for the first time the coexistence of chiral and antichiral topological edge states, and chiral and Gull-Hall topological edge states, on the same photonic crystal structure configuration.

This invention relates to a method for preparing ion-doped yttrium iron garnet powder, belonging to the field of materials preparation. The method specifies a method for preparing ion-doped yttrium iron garnet powder, wherein the chemical composition of the ion-doped yttrium iron garnet powder is Ce. a Bi b Y (3‑a‑b) Fe5O 12 Where a≤0.4, b≤0.4, and a and b are not both 0, the method includes the following process steps: first, synthesizing a polymeric network gel containing Ce, Bi, Y, and Fe ions; then calcining the obtained polymeric network gel to obtain a loose and porous oxide precursor powder; placing the obtained oxide precursor powder in a high-temperature horizontal ball mill for high-temperature controlled-pressure ball milling, and finally obtaining ion-doped yttrium iron garnet powder. The method of the present invention can obtain composite oxide powder with high phase purity, low defect density, and good compactness and grain uniformity.

This invention discloses a high-saturation magnetization, low-loss yttrium iron garnet ferrite material and its preparation method. The aim is to address the shortcomings of existing YIG ferrite materials, which have a saturation magnetization of approximately 1750 Gs, making it difficult to meet the diverse requirements of high-frequency microwave devices for wide bandwidth and low loss performance. Furthermore, simply increasing saturation magnetization through ion substitution often results in increased magnetic loss and broadened ferromagnetic resonance linewidth. This invention proposes a high-saturation magnetization, low-loss yttrium iron garnet ferrite material and its preparation method. This invention achieves a relative permittivity ε through Sr-Zr ion synergistic substitution. r The ferromagnetic resonance linewidth ΔH is 90~105 Oe, and the saturation magnetization is 4π M. s A high-saturation magnetization and low-loss yttrium iron garnet ferrite material with a magnetization range of 1800~1900 Gs has been developed, achieving synergistic optimization of high saturation magnetization and low loss, and providing a material basis for the expanded application of devices such as microwave circulators and isolators.