10 results about "Yttrium iron garnet" patented technology

The invention provides a microwave phase measurement system based on magneton-photon coupling characteristics. According to the system, an integrated electrode support / GGG / YIG / Pt multilayer structure is embedded in a microwave cavity, and magnetons carry microwave phase information through coupling of the magnetons and photons in the YIG. Magneton precession of the YIG layer causes spin current to be generated in the Pt layer, the spin current is converted into measurable voltage signals through inverse spin Hall effect, and high-resolution phase measurement is realized by means of frequency mixing, coherent detection and the like. The method is high in anti-interference capability, can realize high-sensitivity and low-cost microwave phase measurement, and is expected to be used in the fields of spintronics, microwave measurement, quantum information reading and the like.

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.

The invention discloses a high-mechanical-property low-loss high-frequency manganese-zinc power ferrite and a preparation method, and relates to the technical field of soft magnetic ferrite materials. The high-mechanical-property low-loss high-frequency manganese-zinc power ferrite is composed of main components and auxiliary components; the main components comprise, in terms of oxide, 53.5 to 56.5 mol% of Fe2O3, 3.5 to 5.5 mol% of ZnO, and 38.0 to 43.0 mol% of MnCO3; the auxiliary components comprise 0.01-0.03 wt% of nano yttrium iron garnet, 0.01-0.03 wt% of nano yttrium iron garnet, 0.01-0.03 wt% of nano yttrium iron garnet, 0.01-0.03 wt% of nano yttrium iron garnet and 0.01-0.03 wt% of nano yttrium iron garnet, caSiO3: 0.01 wt% to 0.05 wt%; the content of Nb2O5 is 0.01 to 0.04 weight percent; ho2O3: 0.1 wt% to 0.8 wt%; and Co2O3: 0.1 to 0.3 wt%. On the basis of improving the bending strength, the eddy-current loss is reduced, and the high-frequency low-loss high-bending-strength cable has high bending strength and high-frequency low-loss performance.

The application discloses a tunable one-way and two-way microwave wave trap filter and a design method, which has one-way and two-way filtering functions. The device structure mainly comprises an artificial surface plasmonic polariton planar waveguide and a yttrium iron garnet microwave resonator. Circular polarization spin polarized microwave fields with spin-momentum locking characteristics are generated at specific positions in the planar waveguide, and the magnon mode generated in the microwave resonator is spin-selectively coupled with the spin polarized microwave field. Under the critical coupling condition, the microwave input in one direction is completely filtered after the magnon, and the microwave input in the other direction is completely transmitted, so that the one-way filtering function of the microwave at a specific frequency is realized. Further loading of additional microwave resonators and through the extension of the experimental configuration, the two-way filtering function can also be realized. The application provides a more simple and flexible method to realize the multifunctional microwave wave trap filter without complex structure design and strict parameter control.

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.

The invention relates to a preparation method of ion-doped yttrium iron garnet powder, and belongs to the field of material preparation. The invention relates to a preparation method of ion-doped yttrium iron garnet powder, the chemical composition of the ion-doped yttrium iron garnet powder is CeaBibY (3-a-b) Fe5O12, a is less than or equal to 0.4, b is less than or equal to 0.4, and a and b are not 0 at the same time, the method comprises the following process steps: firstly synthesizing polymerized network hydro-gel containing Ce, Bi, Y and Fe ions, then calcining the polymerized network hydro-gel, and drying the calcined polymerized network hydro-gel to obtain the ion-doped yttrium iron garnet powder. Loose and porous oxide precursor powder is obtained; and placing the obtained oxide precursor powder in a high-temperature horizontal throwing type ball mill for high-temperature pressure-controlled atmosphere ball milling, and finally obtaining the ion-doped yttrium iron garnet powder. According to the method, the composite oxide powder with high phase purity, low defect density and good density and grain uniformity can be obtained.

The invention belongs to the technical field of magneto-optical crystal preparation, and relates to a bismuth-doped europium yttrium iron garnet magneto-optical crystal and a preparation method and application thereof. According to the preparation method, a magneto-optical crystal with a chemical formula of Eu < 3-x-y-z > Bi < x > Y < y > Tb < z > Fe < 5-w > Ga < w > O < 12 > is grown by adopting a top seed crystal method, wherein x ranges from 0.30 to 0.43, y ranges from 1.20 to 2.06, z ranges from 0.08 to 0.17, and w ranges from 0.09 to 0.17. The method has the advantages of high crystal growth speed, simple process and the like, and can be used for preparing centimeter-level single crystals. A Bi2O3-Fe2O3 self-service solvent is used for crystal growth, and compared with a Pb-containing cosolvent system, the Bi2O3-Fe2O3 self-service solvent is more environmentally friendly, and harm to a human body and pollution to the environment can be reduced. The Faraday rotation angle of the garnet crystal can be increased by doping Bi in a proper amount.

The invention discloses a high-dielectric high-power low-loss ferrite material and a preparation method thereof, the matrix structure is yttrium iron garnet, the ferrite material belongs to a gyromagnetic ferrite material, the chemical formula of the ferrite material is Y3-a-b-cBiaCabDycZrbIndFe5-b-d-fO12-1. 5f, a is greater than or equal to 0.9 and less than or equal to 1.55, b is greater than or equal to 0.2 and less than or equal to 0.45, c is greater than or equal to 0 and less than or equal to 0.06, d is greater than or equal to 0 and less than or equal to 0.3, and f is greater than or equal to 0 and less than or equal to 0.2. The invention also discloses a preparation method of the ferrite material, the specific gravity of a liquid phase medium is gradually reduced in two times of ball milling, the particle size of the material is reduced, and the particle uniformity is improved. And a sectional sintering process is combined, so that uniform generation of fine grain ferrite is promoted, and precipitation of a second phase is inhibited. According to the ferrite material prepared by the invention, the dielectric constant is 22-31, the ferromagnetic resonance line width is 70-110 Oe, the saturation magnetization is 1600-1950 Gs, and the electromagnetic loss is tan delta epsilon lt; the ferrite material has good performance stability, and can be applied to a small-size ultra-wideband circulator.