34 results about "Iron platinum" patented technology

A spin-torque transfer memory random access memory (STTMRAM) element includes a fixed layer formed on top of a substrate and a a tunnel layer formed upon the fixed layer and a composite free layer formed upon the tunnel barrier layer and made of an iron platinum alloy with at least one of X or Y material, X being from a group consisting of: boron (B), phosphorous (P), carbon (C), and nitride (N) and Y being from a group consisting of: tantalum (Ta), titanium (Ti), niobium (Nb), zirconium (Zr), tungsten (W), silicon (Si), copper (Cu), silver (Ag), aluminum (Al), chromium (Cr), tin (Sn), lead (Pb), antimony (Sb), hafnium (Hf) and bismuth (Bi), molybdenum (Mo) or rhodium (Ru), the magnetization direction of each of the composite free layer and fixed layer being substantially perpendicular to the plane of the substrate.

A magnetic recording disc is provided according to the present invention for magnetic recording. The magnetic recording disc includes a disc substrate having a locking pattern etched therein. Chemically synthesized iron-platinum particles are provided in the locking pattern and completely fill the locking pattern. The chemically synthesized iron-platinum nanoparticles exhibit short-range order characteristics forming self organized magnetic arrays.

An erosion resistant protective structure for a turbine engine component comprises a shape memory alloy. The shape memory alloy includes nickel-titanium based alloys, indium-titanium based alloys, nickel-aluminum based alloys, nickel-gallium based alloys, copper based alloys, gold-cadmium based alloys, iron-platinum based alloys, iron-palladium based alloys, silver-cadmium based alloys, indium-cadmium based alloys, manganese-copper based alloys, ruthenium-niobium based alloys, ruthenium-tantalum based alloys, titanium based alloys, iron-based alloys, or combinations comprising at least one of the foregoing alloys. Also, disclosed herein are methods for forming the shape memory alloy onto turbine component.

The invention discloses a high efficient metal-semiconductor composite photocatalyst for photocatalytic synthesis for preparing ammonia gas from nitrogen and hydrogen, and a preparation method and applications thereof, and belongs to the technical field of catalysis of ammonia synthesis. Super para-magnetic dual-metal (iron-platinum, iron-palladium, iron-gold, or iron-nickel) nano clusters are loaded on semiconductor nitrides, semiconductor oxides, and semiconductor silicon (g-C3N4, ZnO, MoO2, or Si) to obtain the composite photocatalyst with high catalytic activity. The photocatalytic can catalyze synthesis of ammonia namely reactions between N2 and H2 at a room temperature under a normal pressure in the presence of light. The provided novel photocatalyst can be used to replace a conventional catalyst, NH3 can be synthesized from N2 and H2 under milder conditions, the NH3 synthesis cost is reduced, and thus the energy consumption and environmental pollution are effectively reduced.

The invention relates to a method for preparing benzaldehyde through catalytic oxidation of styrene, in particular to a method for preparing the benzaldehyde through the catalytic oxidation of the styrene by using an iron-platinum (FePt) nano-wire as a catalyst. The method comprises the following steps of: using the iron-platinum nano-wire as the catalyst and one of toluene, dioxane, dimethyl formamide, dimethyl sulfoxide, acetonitrile or chloroform as a solvent; in an oxygen atmosphere and under normal pressure, reacting for 3 to 32 hours at the temperature of between 50 and 90 DEG C; cooling the mixture after the reaction, and separating the mixture to obtain the benzaldehyde. The preparation method has a mild reaction condition, has an improved yield compared with that of the prior art, and is more economical and environment-friendly.

The invention discloses a method for preparing hard magnetism iron platinum (FePt) nanometer-particles by using inorganic salt as a precursor and relates to the method for preparing the hard magnetism FePt nanometer-particles. According to the method for preparing the hard magnetism FePt nanometer-particles, the present technical problems of the complex preparation process, high energy consumption, irregular morphology of the nanometer particles and uncontrollable sizes of hard magnetism L10- FePt nanometer-particles obtained by using the surface coating method to conduct high-temperature annealing or a salt bath method are resolved. The method includes the following steps that 1, mixing and stirring are conducted under the shielding gas; 2, heating is conducted; 3, cooling is conducted; and 4, washing and drying are conducted. An easy liquid phrase thermal synthesis method is adopted; oleylamine is used as a solvent, a surfactant and a reducing agent; then, high-temperature thermal reduction of ferrous chloride and potassium chloroplatinate is conducted under a nitrogen atmosphere; the hard magnetism L10- FePt nanometer-particles with excellent magnetic performance is obtained through one step of preparation; and the magnetic performance, morphology and sizes of a product are adjusted further by adjusting the heating rate and the reaction time.

The invention relates to a method for preparing magnetic recording exchange coupling complex film. The method takes flat glass as a substrate and takes a silver target, an iron target, a ruthenium target and an iron-platinum alloy target as a target source, and in a magnetron sputtering furnace, at normal temperature of 20 DEG C plus or minus 1 DEG C, in argon atmosphere and magnetic field condition, in a water circulating cooling state and under constant vacuum degree of 1.0Pa, the exchange coupling complex film is prepared by magnetron sputtering, then high temperature annealing is carried out in a vacuum condition, the iron-platinum alloy is phase-changed to ensure a soft magnetic layer and a hard magnetic layer to combine tightly, and the complex film is silver-gray and of the thickness of 55nm, thus reducing the coercive force of the complex film, satisfying the writing field of a magnetic head and increasing the properties of a super-high density magnetic disk. The preparing method has short process flow, does not pollute the environment and is an ideal method for preparing the magnetic recording exchange coupling complex film.

The invention provides a magnetic recording material compounded by iron-platinum nano-particle self-assembly monofilm and B4C and a preparation method thereof. The preparation method comprises the following steps: the mono-disperse nanometer FePt particles with adjustable grain diameters are spread on an inorganic material substrate to form a self-assembly monofilm structure, a B4C protective layer with thickness of 10-50 nanometers is sputtered on the monofilm by the magnetron sputtering technology, and the B4C protective layer covers and protects the iron-platinum nano-particle monofilm; after high temperature annealing, the complex film magnetic recording material formed by the FePt nano-particles with magnetic phase transition and stable self-assembly is formed. The material has the advantages of good stability, high coercive force, high integration, high repeatability, and the like, which can greatly improve recording density.

Iron-platinum (FePt) based magnetic recording media structures that provide small grain size and isolated-grain configurations suitable for high-density magnetic recording. In one of the structures, the recording media structure includes a thin film containing grains of L1₀ FePt and boron as a segregant contained in intergranular regions located among the FePt grains. In another structure, the recording media structure includes a thin film containing grains of L1₀ FePt, wherein the film is formed on an underlayer containing at least one material selected to control the size of the FePt grains in the film. Proper choices of materials, relative amounts of the materials, processing parameters, and other variables permit these structures to be formed with grain sizes, magnetization orientations, and perpendicular coercivities that allow designers to create magnetic storage devices having storage densities of 1 Tbit/in² and greater.

It has been discovered that iron-platinum ferromagnetic particles can be dispersed in a polymer and coated into or onto, or directly linked to or embedded on to, medical devices and magnetized. The magnetized devices are used to attract, capture, and/or retain magnetically labeled cells on the surface of the device in vivo. The magnetic particles have an iron/platinum core. Annealing the Fe/Pt particle is very important for introducing a L10 interior crystalline phase. The Fe:Pt molar ratio for creation of the crystal phase is important and a molar range of 1.2-3.0 Fe to Pt (molar precursors, i.e. starting compounds) is desired for magnetization. The magnetic force as a whole can be measured with a “Super Conducting Quantum Interference Device”, which is a sensitive magnetometer. The overall magnetic force is in the range from 0.1 to 2.0 Tesla.

A magnetic film comprises a platinum layer having a (001) plane orientation and an island-shaped iron-platinum crystalline arranged on the platinum layer and having a (001) plane orientation parallel to the (001) plane orientation of the platinum layer, wherein the island-shaped iron-platinum crystalline has a composition region consisting of 50 atomic % of each of iron and platinum and exhibits a perpendicular magnetic anisotropy having a high coercive force in a direction perpendicular to the surface of the platinum layer.

The invention provides a method for preparing an FePt pseudo-spin-valve material, and belongs to the field of magnetic materials or spintronics materials. According to the method, prestretching treatment, surface acidification descaling treatment and surface polishing treatment are carried out on a copper-zinc-aluminum Cu-Zn-Al memory alloy substrate; a thin film material is deposited on the Cu-Zn-Al substrate; the structure of the thin film material is iron-platinum FePt/ruthenium Ru/iron-platinum FePt/tantalum Ta; thermal treatment is carried out in a vacuum environment after deposition is completed to induce ordered arrangement of atoms of two FePt layers to form hard magnetic property; and finally, lithographic processing is carried out on a thin film system to obtain a nano columnar array structure and an electrode is led out. Switching of a high resistance state and a high resistance state, namely a pseudo-spin-valve function is achieved by controlling a temperature and controlling a stress state of the thin film system. The method has the characteristics of being simple in preparation and convenient to control; and a high-cost rare metal or an expensive additional device is not needed, so that the method has the advantages of high efficiency, low cost and the like, and is suitable for being applied to a spintronics technology in the future.

The invention relates to a strong magnetic dielectric film, and in particular relates to a vertical orientation strong magnetic dielectric film and a preparation method thereof. The technical scheme is as follows: the vertical orientation strong magnetic dielectric film comprises a substrate, a buffer layer, a vertical orientation strong magnetic dielectric protective layer and a protective layer sequentially stacked, wherein the substrate is a single crystal, polycrystal or amorphous base plate; the buffering layer is made of inorganic nonmetal nitride ceramic with a hexagonal crystal structure; the vertical orientation strong magnetic dielectric protective layer is a samarium-cobalt diaphragm, an aluminum-nickel-cobalt diaphragm, an iron-platinum diaphragm, an iron-palladium nitride, a cobalt-platinum diaphragm or a cobalt-palladium diaphragm; the protective layer is made of transition metal, nitride diaphragm material or oxide diaphragm material. The vertical orientation strong magnetic dielectric film and the preparation method thereof provided by the invention have the advantages of being small in volume, vertical in magnetization direction, small in size of grains serving as a storage unit, large in coercivity and high in stability, and is simple in production technology and wider in application range.

The invention provides a self-assembly magnetic memorizer which comprises a memorizer body. The memorizer body comprises a disc-shaped hard disk substrate, a plurality of annular rail grooves are formed in the hard disk substrate by taking the circle center of the hard disk substrate as the center, a silicon dioxide nanosphere array is arranged in the rail grooves, the surfaces, in contact with the air, of silicon dioxide nanospheres are provided with iron platinum thin films, and an iron platinum dot matrix is formed. A forming method of the self-assembly magnetic memorizer comprises the steps that the annular rail grooves are etched in the hard disk substrate with the photoetching technique; the silicon dioxide nanosphere array is prepared in the rail grooves in a nanometer self-assembly micromachining way; the iron platinum thin films are grown on the silicon dioxide nanospheres, and the regular iron platinum dot matrix is formed. The self-assembly magnetic memorizer lowers the coupling effect of magnetic domains to the maximum degree, meets the requirement for high magnetic recording density, and has environmental stability at the same time. The forming method of the self-assembly magnetic memorizer overcomes physical defects of traditional continuous magnetic storage media.

The invention provides a magnetic resonance mutation spectrum material and a preparation method thereof, and in particular, the preparation method of the magnetic resonance mutation spectrum material comprises the following steps: 1) sample loading: iron platinum powder is put in an induction composite heating powder preparation device containing a heat resisting crucible; argon is charged after vacuumizing; and the pressure of the argon is kept at 1 KPa; 2) melting: a high-frequency induction power supply is started for heating to melt the iron platinum powder; and the input power is 10 KW; and 3) irradiation:an ultrasonic source or an ultrasonic wave-laser composite source radiation source is leaded in to adjust a distance between an argon shielding gas nozzle and a molten metal level as 20-25 mm to obtain black powder, namely the magnetic resonance mutation spectrum material. The magnetic resonance mutation spectrum material with different crystal form ratios is obtained through changing a laser-induction composite heating powder preparation device.

The invention relates to a method for directly driving ordering of atoms of a magnetic recording medium film by current, belonging to the technical field of high-density magnetic recording media material. The method of the invention comprises the following steps: sequentially depositing iron platinum FePt atoms and tantalum Ta atoms the thickness of which is in a range of 50-500 angstrom on a glass substrate by a magnetron sputtering method, wherein the background vacuum degree is 1*10<-5>-7*10<-5>Pa, the pressure of argon gas (99.99%) when sputtering is 0.4-1.2Pa, and the temperature of the substrate is 20-800 DEG C; after deposition, cooling the film to the room temperature, leading out Cu electrodes from the two ends of the film and connecting with a constant current source; and putting a sample into a vacuum furnace, and when the vacuum degree in the furnace is 2*10<-5>-7*10<-5>Pa, conducting current at the two ends of the film, wherein the current size is 50mA-1000mA, and the conduction time is 5s-300s. In the invention, the Fe atoms and the Pt atoms are driven to move in order by the heat generated by the resistance of the film, thereby greatly reducing heat loss in the traditional annealing process, and improving the effective utilization ratio of heat; and the invention has simple structure and low cost and is suitable for production in the future.

The invention provides a disk disc. The disk disc comprises a substrate layer, a first electrode layer and a second electrode layer, the magnetic layer is positioned on the substrate layer. The protective layer is positioned on the magnetic layer; wherein the magnetic layer comprises a first iron-platinum alloy film. The substrate layer is a crystal, so that the substrate layer induces the first iron-platinum alloy film to form an ordered magnetic layer. The invention further provides a disk disc manufacturing method and a magnetic memory device. According to the disk disc, the iron-platinum alloy material is adopted as the magnetic layer, the magnetic anisotropy energy of the iron-platinum alloy is high, the requirement for the magnetic anisotropy energy of all grain sizes can be met, themagnetic layer is induced to form the ordered phase magnetic layer based on the substrate layer, and the magnetic recording medium is high in heat stability.