39 results about "High saturation magnetization" patented technology

The invention provides amorphous nanocrystalline soft magnetic alloy powder, a preparation method thereof and a magnetic powder core, and relates to the technical field of soft magnetic materials. According to the preparation method of the amorphous nanocrystalline soft magnetic alloy powder, a high-energy electric pulse technology is adopted, an amorphous alloy material is instantly and rapidly heated and exploded, the particle size of the powder is accurately regulated and controlled by accurately regulating and controlling an energy input parameter and a spacing parameter, and the high-sphericity soft magnetic powder with the median particle size being 0.5-5 microns is prepared; the uniformity and dispersity of the powder are remarkably improved, and the problem of low particle size control precision in the prior art is solved. The preparation method is simple in technological process and low in energy consumption, impurities and defects introduced in a traditional multi-step technology are avoided, and the purity and performance of the material are improved. The prepared amorphous nanocrystalline soft magnetic alloy powder has the characteristics of small particle size, high sphericity, high saturation magnetization, low coercive force and high yield, and is particularly suitable for the fields of high-frequency magnetic elements and precision electronic devices.

The application belongs to the technical field of ferrite material preparation, and particularly provides a modified self-biased hexagonal gyromagnetic ferrite material and a preparation method thereof. The modified self-biased hexagonal gyromagnetic ferrite material comprises a main component and an additive. The main component comprises 74.5 mol% to 82.8 mol% of Fe2O3, 1.3 mol% to 6.1 mol% of Cr2O3, and the rest of BaCO3. Taking the weight of the main component after pre-sintering as a calculation basis, the additive comprises 0.5 wt% to 2.0 wt% of CaCO3, 0.5 wt% to 2.0 wt% of SiO2, and 0.1 wt% to 2.0 wt% of Bi2O3. The modified self-biased hexagonal gyromagnetic ferrite material (BaM) prepared through a sintering process optimization has the characteristics of high saturation magnetization (4πM s : 3.9~4.2kGs), high remanence ratio (M r / M s : 0.6~0.8), coercivity (H c : 450~550Oe), and low ferromagnetic resonance line width (ΔH: 230~280Oe), and meets the engineering requirements of microwave devices.

The present invention provides hexagonal ferrite magnetic powder which is extremely useful in achieving both an increase in recording density and an increase in SNR of a magnetic recording medium, is crystalline and has a high saturation magnetization. The hexagonal ferrite magnetic powder contains Bi in a range of a Bi / Fe molar ratio of 0.035 or less, has a saturation magnetization σs of 42.0 Am 2 / kg or more, and a Dx volume of 1800 nm 3 or less, based on a microcrystal diameter. The magnetic powder can be produced by a method for producing hexagonal ferrite magnetic powder, comprising a process of immersing hexagonal ferrite magnetic powder containing Bi in a solution in which a compound X that forms a complex with Bi is dissolved, thereby performing a treatment of dissolving a part of the Bi present in the hexagonal ferrite magnetic powder into the solution.

The application provides a magnetic tunnel junction device, comprising: a reference layer, a barrier layer, a free layer and a cap layer which are stacked, the reference layer has a fixed magnetization which is substantially perpendicular to the plane of the reference layer, the free layer has a magnetization which is substantially perpendicular to the plane of the free layer and can be switched between parallel or anti-parallel to the magnetization direction of the reference layer, the free layer comprises a first ferromagnetic layer and a second ferromagnetic layer which are stacked, the first ferromagnetic layer is arranged adjacent to the barrier layer and has a high saturation magnetization. The application can reduce the switching current of the magnetic tunnel junction device.

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.

The application discloses a kind of dual-phase soft magnetic high-entropy alloy and preparation method thereof.The high-entropy alloy is composed of iron (Fe), cobalt (Co), chromium (Cr) and vanadium (V), with face-centered cubic (FCC) and body-centered cubic (BCC) dual-phase structure.The preparation method includes the following steps: design of dual-phase high-entropy alloy; preparation of alloy; homogenization treatment; controlled cold rolling; two-stage isothermal treatment.Based on the above process, the prepared high-entropy alloy has FCC and BCC dual-phase, FCC phase rich in Co, Cr and V, and BCC rich in Fe.Two-phase layered lamellar phase alternately forms pearlite-like structure.The dual-phase soft magnetic high-entropy alloy has high saturation magnetization (50-200 emu / g), low coercivity (50-100 Oe), high tensile yield strength (800-2000 MPa) and moderate plasticity (10-30%), and the mechanical and magnetic properties of the high-entropy alloy can be further adjusted by adjusting the heat treatment conditions.The method is simple and easy to operate, and can be widely applied to the preparation of various high-entropy alloys, with wide application prospect.

The invention relates to the technical field of amorphous alloy, in particular to a Fe-based amorphous alloy strip and a preparation method and application thereof, and the Fe-based amorphous alloy strip comprises the following elements of, by atomic percent, 75%-85% of Fe, 0.5%-4% of Si, 5%-12% of B, 0.1%-4% of P, 0.1%-4% of C, 0.5%-6% of Mo and 0.5%-5% of Ni. The sum of the atomic percentage contents of Fe, Si, B, P, C, Mo and Ni is 100%. According to the invention, the molybdenum element and the nickel element are introduced, so that the Fe-based amorphous alloy strip has high saturation magnetization, and meanwhile, the wear resistance and the toughness are remarkably improved.

This invention belongs to the field of metallic materials technology, and particularly relates to an Fe-Nb-B-Y amorphous alloy, its preparation method, and its applications. The alloy has the following atomic percentage expression: (Fe 85 B 14.7 Nb 0.3 ) 100‑x Y x Where 0.2≤x≤0.3. This Fe-Nb-B-Y amorphous alloy maintains high glass-forming ability while also possessing low coercivity and high saturation magnetization.

The invention discloses a metal-doped magnetic algae-based composite material as well as a preparation method and application thereof, and belongs to the technical field of composite material preparation. The preparation method comprises the following steps: crushing an algae biomass raw material to obtain pretreated algae slurry; the preparation method comprises the following steps: dissolving soluble trivalent ferric salt, soluble divalent ferrous salt and metal salt Mn < + > in water to prepare a mixed metal salt solution; adding the pretreated algae slurry into a mixed metal salt solution, under a stirring state, adjusting the pH value of a mixed system to be alkaline, carrying out a heating reaction, and after the reaction is finished, carrying out solid-liquid separation and washing to obtain a metal-doped magnetic algae-based precursor; and placing the metal-doped magnetic algae-based precursor in a high-temperature furnace under the protection of an inert atmosphere, carrying out heating treatment, and after pyrolysis is finished, cooling to room temperature to obtain the metal-doped magnetic algae-based composite material. The metal-doped magnetic algae-based composite material has high saturation magnetization, and can realize efficient adsorption of heavy metal ions and organic pollutants when being applied to wastewater treatment.

The invention discloses a high-entropy alloy modified fiber, a composite material and a preparation method thereof, and belongs to the technical field of protection. The high-entropy alloy modified fiber comprises carbon fiber and nano-particles which are physically pinned on the surface of the carbon fiber in a semi-embedded state; the nanoparticle comprises a metastable state high-entropy alloy core with high saturation magnetization, a dense dielectric oxide middle layer and a carbon shell. The ultra-fast Joule thermal shock technology is adopted to form a gradient sandwich core-shell structure of a metastable state alloy core, a compact oxide middle layer and a few-layer defect state carbon shell. The high-entropy alloy / fiber reinforced multifunctional composite material has a multi-stage interface structure, comprises a macroscopic fiber / matrix interface, a mesoscopic particle / fiber pinning interface and a microscopic particle internal core-shell interface, and is suitable for multifunctional integrated protection scenes such as electromagnetic stealth, severe environment corrosion resistance and impact and explosion resistance.

This invention discloses an iron-based amorphous nanocrystalline nanoparticle and its pressed magnetic core, preparation method, and application, belonging to the field of soft magnetic materials technology. The preparation method includes: target material preparation, using an induction melting furnace to prepare a master alloy ingot, and then machining it into the desired alloy target material using wire cutting; atomic fabrication of nanoparticles, using laser inert gas condensation technology to prepare iron-based amorphous nanocrystalline nanoparticle powder; and pressing molding, with a minimum molding pressure of less than 0.1 GPa. The iron-based amorphous nanocrystalline nanoparticle magnetic core of this invention has the following advantages: extremely low high-frequency loss, P cv (0.05 T, 100 kHz)=78‑94 mW / cm 3 , P cv (0.01 T, 1 MHz)=11‑53 mW / cm 3 It has a loss value far lower than that of traditional amorphous and nanocrystalline magnetic powder cores under the same conditions; and a high saturation magnetization intensity, which can reach 160-188 emu / g.

The invention provides a hollow PtAgS nanocrystalline material as well as a preparation method and application thereof, and belongs to the technical field of synthesis of nano materials. A simple two-step hydrothermal method is adopted, firstly, a gel precursor is synthesized to serve as a self-sacrifice template, then a platinum source, a silver source, a sulfur source and the template are subjected to a hydrothermal reaction together, and the hollow PtAgS nanocrystal is obtained. According to the preparation method disclosed by the invention, platinum and silver atoms are induced to diffuse outwards from a sulfur-containing core by utilizing twin crystal defects formed in the initial stage of reaction, so that a hollow structure is formed; the process is simple and efficient, the product is pure, the structure is uniform and controllable, and the prepared hollow PtAgS nanocrystal is a ternary alloy nanocrystal with a uniform hollow structure, has twin crystal defects, shows excellent soft magnetic properties including high saturation magnetization and low coercive force, is particularly suitable for high-frequency and low-loss magnetic devices, and has wide application prospects. Such as miniaturized electronic components and magnetic sensors, and has a wide industrial application prospect.

The present application belongs to the field of electronic information functional materials and microelectronic devices, and relates to a microwave ferrite material, and particularly provides an LTCC high-curie-temperature NiZn ferrite substrate material and a preparation method thereof, to solve the defects of the existing low-temperature sintering NiCuZn ferrite substrate material, such as low curie temperature, high microwave magnetic loss and dielectric loss, low saturation magnetization and low dielectric constant; the present application uses Cu-doped high Ni / Zn ratio NiZn ferrite as a main material, and uses Bi2O3-CuO composite eutectic mixture as an auxiliary material, and the two are low-temperature co-fired to form a substrate material, which not only has a low sintering temperature (about 900 DEG C), but also has excellent microwave characteristics: high curie temperature (about 302 DEG C), low ferromagnetic resonance line width (about 100 Oe), low dielectric loss (loss tangent value about 8*10 ‑4 ) and high saturation magnetization (about 4959 Guass), which not only meets the requirements of the LTCC process, but also has excellent magnetic properties of the key substrate material required by the microwave ferrite device.

The invention belongs to the field of electrochemical catalytic materials, and particularly relates to a method for preparing a ferromagnetic NiFeCo / CNFs alkaline OER catalyst based on Joule heat, which comprises the following steps: preparing a spinning solution, preparing CNFs precursor fibers by electrostatic spinning, and preparing the catalyst by Joule heat at different temperatures (600 / 800 / 1000 / 1200 / 1400 DEG C). Compared with other temperature samples, the NiFeCo / CNFs prepared by Joule heat at 1200 DEG C has the highest saturation magnetization intensity (13.7 emu / g) and the optimal alkaline OER performance, and the 30h stability retention rate exceeds 95%. The preparation method is simple and controllable, the material has high magnetism and high catalytic activity, a high-quality catalyst can be provided for the field of hydrogen production through water electrolysis, and the application prospect is good.

The present invention provides an undercooling solidification method for preparing an amorphous or nanocrystalline soft magnetic alloy with high Fe content and the applicable amorphous or nanocrystalline alloy composition. The undercooling solidification is realized by glass purification combined with cyclical superheating or electromagnetic levitation melting. An undercooling solidification alloy is prepared into amorphous strips or powders through rapid quenching or atomization of melt, and can be prepared into a nanocrystalline alloy through heat treatment. The chemical formula of the applicable amorphous or nanocrystalline alloy is FeSiBM, wherein M is one or more of P, C, Nb, Mo, Zr, Hf, Mo, Y, Cu and Co. The amorphous or nanocrystalline alloy prepared by undercooling non-equilibrium solidification has the characteristics of high amorphous forming ability, high saturation magnetization and low coercive force.

The application discloses a composite gyromagnetic ferrite substrate material for an LTCF phase shifter and belongs to the technical field of electronic ceramic materials. 4+ 3+ 3+ The main LiZn ferrite is selected from Ti 4+ , Mn 3+ , Bi 3+ ion substituted iron-deficient formula, which ensures low-temperature sintering and has high saturation magnetization and low ferromagnetic resonance line width; the auxiliary SrM ferrite is selected from micro-nano structure particles with high Curie temperature, the SrM ferrite with the structure has high sintering activity, and is beneficial to forming a multiple dense microstructure mainly with fine grains in the low-temperature sintering process, so that the material has high residual magnetism ratio and high saturation magnetization.

To provide a Co-free ferrite calcined body having a high saturation magnetization σs. [Solution] General formula showing the atomic ratio of metallic elements Ca, R, Fe, and Zn (where R is at least one rare earth element and must contain La): Ca 1-x R x Fe 2n-y Zn y A ferrite calcined body in which x, y, and n (where 2n is a molar ratio and is expressed as 2n = (Fe + Zn) / (Ca + R)) satisfy the following conditions: 0.35 ≤ x ≤ 0.7, 0 ≤ y < 0.5, and 4.5 ≤ n ≤ 6.0.

This invention relates to a low-loss microwave ferrite material for LTCF phase shifters and its preparation method, belonging to the field of electronic ceramic materials technology. The microwave ferrite material comprises a main material and auxiliary materials, with the auxiliary materials accounting for 0.01–2 wt.% of the main material. The main material consists of: Li₂CO₃ 11.65–12.33 mol%, ZnO 17.61–22.18 mol%, TiO₂ 8.22–13.31 mol.%, Mn₃O₄ 1.85–1.96 mol%, Fe₂O₃ 50.93–59.79 mol%, and Bi₂O₃ 0.08–0.09 mol%. The auxiliary material is rutile or anatase TiO₂ with a particle size of 5 nm–50 nm. The low-loss microwave ferrite material for LTCF phase shifters prepared by this invention, in addition to having a low sintering temperature (≤910℃), also has a narrow ferromagnetic resonance linewidth (≤90Oe) and low dielectric loss (<3×10⁻⁶). ‑4 It possesses high saturation magnetization (>3700 Gauss), high remanence ratio (>0.85), and high Curie temperature (>300℃). The fabricated microwave ferrite not only meets the requirements of LTCF process but also possesses excellent magnetic properties required for key substrate materials in microwave devices such as low-loss phase shifters.

The invention discloses a system, a process and a catalyst for driving rapid cold start of ammonia decomposition through magnetic induction heating, and belongs to the technical field of hydrogen energy preparation. The system comprises a gas path unit, a catalyst bed filled with a magnetic cobalt-based catalyst, a detection unit, a magnetic induction heating device and a hydrogen fuel cell integration unit. The catalyst takes Al2O3 as a carrier, metal cobalt nanoparticles are loaded, and the catalyst has high saturation magnetization. When the system works, the magnetic induction heating device generates an alternating magnetic field, so that the catalyst quickly generates heat, the ammonia decomposition reaction temperature can be reached within 10 seconds, and second-level cold start is realized. Meanwhile, the catalyst has high activity on ammonia decomposition, and the ammonia conversion rate is close to 100%. The problems that a traditional ammonia decomposition system is slow in starting and high in energy consumption are solved, and the system is particularly suitable for mobile scenes such as ammonia power vehicles and portable fuel cells needing rapid and instant hydrogen production.

This invention belongs to the field of microwave absorbing materials technology, specifically relating to a carbon composite microwave absorbing material and its preparation method. The invention uses degummed waste filter cotton as a carbon source, employing an impregnation method to impregnate the pretreated waste filter cotton in magnetic metal salts, followed by heat treatment to obtain the composite microwave absorbing material. The carbon skeleton formed by the heat-treated waste filter cotton constitutes a conductive network in the composite material, exhibiting good dielectric loss. Magnetic metal elements and their alloys possess high saturation magnetization, providing magnetic loss in the composite material. The synergistic effect of dielectric and magnetic losses solves the problem of poor impedance matching in single carbon materials. The preparation process of this invention is simple and pollution-free, solving the environmental pollution problems caused by traditional waste filter cotton treatment methods, and is easy for large-scale production. The resulting composite microwave absorbing material is lightweight, efficient, has good impedance matching, and possesses excellent microwave absorption performance.

The invention relates to the field of magnetic nano materials, in particular to a superparamagnetic composite magnetic material and a preparation method and application thereof. The superparamagnetic composite magnetic material is of a jujube cake structure in which superparamagnetic nanoparticles are dispersed and embedded in a polymer matrix. The superparamagnetic composite magnetic material with the jujube cake structure has high saturation magnetization intensity; according to the preparation method disclosed by the invention, the superparamagnetic nano-particles can be prepared into the superparamagnetic composite magnetic material with a larger size, the prepared superparamagnetic composite magnetic material is high in saturation magnetization intensity, and the limitation of the size of the superparamagnetic nano-particles on the magnetic intensity is broken through; the superparamagnetic composite magnetic nano material with the jujube cake structure is suitable for preparing a demulsifier in oilfield development.

The application provides an amorphous nanocrystalline soft magnetic alloy powder and a preparation method and a magnetic powder core thereof, and relates to the technical field of soft magnetic materials. The preparation method of the amorphous nanocrystalline soft magnetic alloy powder adopts high-energy electric pulse technology to realize instantaneous rapid heating and explosion of the amorphous alloy material, and realizes accurate control of the powder particle size by accurately controlling energy input parameters and interval parameters, thereby preparing high-sphericity soft magnetic powder with a median particle size of 0.5-5 mu m, significantly improving the uniformity and dispersity of the powder, and solving the problem of low particle size control accuracy in the prior art. Moreover, the preparation method has a simple process flow and low energy consumption, avoids impurities and defects introduced in the traditional multi-step process, and improves the purity and performance of the material. The prepared amorphous nanocrystalline soft magnetic alloy powder has the characteristics of small particle size, high sphericity, high saturation magnetization, low coercivity and high yield, and is particularly suitable for the field of high-frequency magnetic elements and precision electronic devices.

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 Fe-Gd-B-Cu nanocrystalline alloy with excellent soft magnetic performance and a preparation method and application of the Fe-Gd-B-Cu nanocrystalline alloy, and belongs to the technical field of alloy materials. The invention provides Fe-Gd-B-Cu with excellent soft magnetic performance, the atomic percentage expression of the nanocrystalline alloy is FexGdyBmCin, x is the atomic content corresponding to the Fe element, y is the atomic content corresponding to the Gd element, m is the atomic content corresponding to the B element, n is the atomic content corresponding to the Cu element, 85 < = x < = 95, 1 < = y < = 3, 5 < = m < = 8, 0.1 < = n < = 2, and x + y + m + n = 100. The Cu element is added into a Fe-Gd-B nanocrystalline alloy system, the soft magnetic performance of the nanocrystalline alloy material is optimized, the Fe-based alloy with excellent soft magnetic performance is obtained, typical soft magnetic performance is presented, and the nanocrystalline alloy with low coercive force and high saturation magnetization intensity is obtained.

The invention belongs to the technical field of intelligent magnetic material preparation and low-temperature sealing environment application thereof, and particularly relates to a preparation method of high-performance magnetic liquid for a low-temperature sealing environment. The method comprises the following steps: (1) controllably doping different ions to prepare ferrite nanoparticles with high saturation magnetization at low temperature; (2) adjusting the pH value of the reaction liquid to change the zeta potential on the surface of the nano magnetic particles; (3) carrying out effective chemical coating on the particles by using oleic acid; and (4) uniformly dispersing the coated particles in low-temperature hydraulic oil to prepare the low-temperature-resistant magnetic liquid with high dispersion stability. The prepared magnetic liquid has a saturation magnetization value and fluidity which are obviously higher than those of conventional magnetic liquid at low temperature, and can be applied to the application fields of hydraulic mechanical sealing and low-temperature environment high-end sealing.

The application belongs to the field of polymer composite materials, and provides a low-frequency wave-absorbing / heat-conducting composite material and a preparation method thereof.The low-frequency wave-absorbing / heat-conducting composite material is prepared from CoNi fillers and polydimethylsiloxane; the CoNi fillers are prepared from cobalt salt and nickel salt under the conditions of a directing agent and a reducing agent; and the directing agent includes one or more of polyvinylpyrrolidone, cetyltrimethylammonium bromide and diethylenetriamine. The CoNi fillers are prepared by using one or more of polyvinylpyrrolidone, cetyltrimethylammoniun bromide and diethylenetriamine as a shape directing agent, so that the composite material has excellent heat conductivity and wave-absorbing performance; meanwhile, the composite material has high saturation magnetization, low coercivity and low-frequency wave-absorbing performance.

The application provides an amorphous nanocrystalline soft magnetic alloy powder and a preparation method and a magnetic powder core thereof, and relates to the technical field of soft magnetic materials. The preparation method of the amorphous nanocrystalline soft magnetic alloy powder adopts high-energy electric pulse technology to realize instantaneous rapid heating and explosion of the amorphous alloy material, and realizes accurate control of the powder particle size by accurately controlling energy input parameters and interval parameters, thereby preparing high-sphericity soft magnetic powder with a median particle size of 0.5-5 mu m, significantly improving the uniformity and dispersity of the powder, and solving the problem of low particle size control accuracy in the prior art. Moreover, the preparation method has a simple process flow and low energy consumption, avoids impurities and defects introduced in the traditional multi-step process, and improves the purity and performance of the material. The prepared amorphous nanocrystalline soft magnetic alloy powder has the characteristics of small particle size, high sphericity, high saturation magnetization, low coercivity and high yield, and is particularly suitable for the field of high-frequency magnetic elements and precision electronic devices.

The application discloses a kind of magnetic calix [4] areal covalent organic framework and its preparation method and application, it is related to organic compound technical field.The magnetic calix [4] areal covalent organic framework of the application has core-shell structure, with magnetic nano particle as core;With aldehyde group calix [4] areal connection and 4,4'-diamino azobenzene covalent organic framework formed as shell.The magnetic calix [4] areal covalent organic framework of the application has excellent adsorption performance, strong enrichment capacity, also has the characteristics of high saturation magnetization, can satisfy magnetic separation demand, and good thermal stability, can be repeatedly used.The magnetic calix [4] areal covalent organic framework can be used for fusarium toxin detection, also has practical application value in food analysis and environmental analysis.

The invention discloses a high-magnetism composite film layer for a glass substrate as well as a preparation method and application of the high-magnetism composite film layer, and belongs to the technical field of functional coating materials and surface engineering. The problems that the binding force between a magnetic composite film layer and the glass substrate is low, internal stress is high, and large thickness and high saturation magnetization cannot be achieved are solved. A Cr layer, a NiCr layer and a Fe layer are sequentially deposited on the surface of a glass substrate by adopting a magnetron sputtering technology, and a strong bonding layer, a stress buffering and toughening transition layer and a magnetic functional layer are sequentially arranged from the surface of the glass substrate to the outside by utilizing a functional gradient three-layer structure design. Under the support of the bottom layer structure, the magnetic functional layer can be deposited to a micron-level thickness, so that the magnetic performance of the magnetic functional layer is maximized, and the magnetic attraction force of a far-surface magnetic patch is provided. The film layer can be positioned on the back surface and the front surface of the glass, so that complete glass texture and attractiveness are kept, and the dual requirements of high-end household appliances on aesthetics and functions are perfectly met.

This invention provides a core-shell structured iron-based nanocrystalline alloy composite powder, its preparation method, and its applications. The alumina coating layer has a thickness of 60-100 nm, and the alumina accounts for 2-5% of the mass percentage of the composite powder. The carbon coating layer has a thickness of 40-60 nm, and the carbon accounts for 4-15% of the mass percentage of the composite powder. This invention uses an iron-based nanocrystalline alloy as the core, surrounded by an alumina and carbon composite coating layer. The resulting composite powder is lightweight, highly corrosion-resistant, and possesses excellent magnetic properties such as high saturation magnetization and high permeability.