94results about How to "High polarization" patented technology

A MTJ for a spintronic device is disclosed and includes a thin composite seed layer made of at least Ta and a metal layer having fcc(111) or hcp(001) texture as in Ta/Ti/Cu to enhance perpendicular magnetic anisotropy (PMA) in an overlying laminated layer with a (CoFe/Ni)_X, (Co/NiFe)_X, (Co/NiCo)_X, (CoFe/NiFe)_X, or (CoFe/NiCo)_X composition where x is from 5 to 30. In one embodiment, a CPP-TMR spin valve has one or both of a laminated free layer and laminated reference layer with the aforementioned compositions. The MTJ includes an interfacial layer made of CoFeB, CoFeB/CoFe, or CoFe/CoFeB between each laminated structure and the tunnel barrier. The laminated layers are deposited by a low power and high Ar pressure process to avoid damaging interfaces between adjoining layers. Annealing occurs at 220° C. to 400° C. A laminated layer with high PMA may also be included in one or more layers of a spin transfer oscillator.

It is made possible to obtain high performance having high controllability in polarization mode even when a vertical cavity surface emitting laser diode is fabricated on an ordinary substrate with a plane orientation (100) plane or the like. A vertical cavity surface emitting laser diode includes: a substrate; a semiconductor active layer which is formed on the substrate and has a light emitting region; a first reflecting mirror and a second reflecting mirror sandwiching the semiconductor active layer; a first recess which has a first groove depth penetrating at least the semiconductor active layer from the outermost layer of the first reflecting mirror; a second recess having a second groove depth shallower than the first groove depth; a mesa portion which is surrounded by the first and second recesses; and an insulating film which is buried in the first recess.

A ferroelectric memory device has a high performance, includes no Pb, and can be directly mounted onto an Si substrate. The ferroelectric memory device includes a (001)-oriented BiFeO₃ ferroelectric layer 5 with a tetragonal structure, which is formed on an electrode 4 made of a perovskite material formed on an Si oxide film. The electrode 4 with a perovskite structure is formed by an ion beam assist method.

A magnetic memory element utilizing spin transfer switching includes a pinned layer, a tunneling barrier layer and a free layer structure. The tunneling barrier layer is disposed on the pinned layer. The free layer structure includes a composite free layer. The composite free layer includes a first free layer, an insert layer and a second free layer. The first free layer is disposed on the tunneling barrier layer and has a first spin polarization factor and a first saturation magnetization. The insert layer is disposed on the first free layer. The second free layer is disposed on the insert layer and has a second spin polarization factor smaller than the first spin polarization factor and a second saturation magnetization smaller than the first saturation magnetization. Magnetization vectors of the first free layer and the second free layer are arranged as parallel-coupled.

A precursor for forming a thin film of layered superlattice material is applied to an integrated circuit substrate. The precursor coating is heated using rapid thermal processing (RTP) with a ramping rate of 100° C./second at a hold temperature in a range of from 500° C. to 900° C. for a cumulative heating time not exceeding 30 minutes, and preferably less than 5 minutes. In fabricating a ferroelectric memory cell, the coating is heated in oxygen using RTP, then a top electrode layer is formed, and then the substrate including the coating is heated using RTP in oxygen or in nonreactive gas after forming the top electrode layer. The thin film of layered superlattice material preferably comprises strontium bismuth tantalate or strontium bismuth tantalum niobate, and preferably has a thickness in a range of from 25 nm to 120 nm. The process of fabricating a thin film of layered superlattice material typically has a thermal budget value not exceeding 960,000° C.-sec, preferably less than 50,000° C.-sec.

The invention provides a Bi0.92-xHo0.08AExFe0.97Mn0.03O3-Zn1-yNiyFe2O4 ferromagnetic composite film and a preparation method thereof. The ferromagnetic composite film comprises a Bi0.92-xHo0.08AExFe0.97Mn0.03O3 crystalline film and a Zn1-yNiyFe2O4 crystalline film, which are compounded together. The preparation method is as below: first respectively preparing a Zn1-yNiyFe2O4 precursor solution and a Bi0.92-xHo0.08AExFe0.97Mn0.03O3 precursor solution, wherein AE is Sr, Ca, Ba or Pb, x equals to 0.01-0.04, and y equals to 0.1-0.9; preparing a plurality of Zn1-yNiyFe2O4 films on a substrate by spin coating; and then preparing plurality of Bi0.92-xHo0.08AExFe0.97Mn0.03O3 films on the Zn1-yNiyFe2O4 films by spin coating, so as to obtain the ferromagnetic composite film. The method regulates the crystal structure of BiFeO3 by doping, and uses ferromagnetic Zn1-yNiyFe2O4 as the magnetic layer, so as to substantially increase the ferroelectric and ferromagnetic properties of the film, and effectively reduce the leakage current density of the film.

Belonging to the field of electronic composite materials and nano-functional materials, the invention provides a double-layer structure flexible piezoelectric film with high output, a preparation andapplication method thereof. A layer-by-layer solution spin coating-heat treatment process is adopted, an inorganic piezoelectric material is used as the filler to enhance the piezoelectric output of the composite film, and the double-layer structure is utilized to acquire high output and good mechanical properties at the same time. The inorganic filler is nanoparticles or nanofiber of barium titanate, barium strontium titanate, lead zirconate titanate and other piezoelectric ceramics, or nanoparticles or nanofiber of magnesium oxide, zinc oxide and other metal oxides, or multiwalled carbon nanotube. The polymer matrix can be polyvinylidene fluoride, polyvinylidene fluoride-trifluoroethylene, polyvinylidene fluoride-trifluoroethylene-hexafluoropropylene and other materials. By adjusting thefiller content and the filler distribution in the double layers, the filler efficiency can be improved. The composite material has the characteristics of good flexibility, high piezoelectric output,high sensitivity and light weight, and can be used as a power supply of wearable equipment, as a flexible sensor to detect human activities and the like.

A current perpendicular to plane magnetoresistive sensor having improved resistance amplitude change and reduced spin torque noise. The sensor has an antiparallel coupled pinned layer structure with at least one of the layers of the pinned layer structure includes a high spin polarization material such as Co₂FeGe. The sensor can also include an antiparallel coupled free layer.

The invention discloses a multiferroic Bi0.96-xSr0.04RExFe0.94Mn0.04Cr0.02O3-NiFe2O4 composite film and a preparation method thereof. The composite film comprises a Bi0.96-xSr0.04RExFe0.94Mn0.04Cr0.02O3 crystalline state film and a NiFe2O4 crystalline state film which are compounded together. The preparation method comprises the following steps: respectively preparing a Bi0.96-xSr0.04RExFe0.94Mn0.04Cr0.02O3 precursor solution and a NiFe2O4 precursor solution; and spinning on a substrate to prepare a multilayer NiFe2O4 film, and spinning on the NiFe2O4 film to prepare a multilayer Bi0.96-xSr0.04RExFe0.94Mn0.04Cr0.02O3 film, thereby obtaining the target product. The equipment requirement is simple, the prepared film is high in uniformity, the doping amount is easy to control, and the ferroelectric properties and ferromagnetic properties of the film are greatly improved. Meanwhile, the leakage current density of the film is effectively reduced.

Disclosed herein are layered Heusler alloys. The layered Heusler alloys can comprise a first layer comprising a first Heusler alloy with a face-centered cubic (fcc) crystal structure and a second layer comprising a second Heusler alloy with a fcc crystal structure, the second Heusler alloy being different than the first Heusler alloy, wherein the first layer and the second layer are layered along a layering direction, the layering direction being the [110] or [111] direction of the fcc crystal structure, thereby forming the layered Heusler alloy.

The invention discloses a bismuth-based lead-free high energy storage density ceramic material and a preparation method thereof, the material and the preparation method relate to the technical field of electronic ceramics and components, and are used in related fields of energy storage capacitor application. The chemical composition of the material conforms to the general formula: (1-x)Bi0.5Na0.5TiO3+x SrTiO3+ywt%Nb2O5, which is synthesized by traditional ceramic preparation process. Through the addition of Nb, the grain size of ceramics is refined, and the breakdown field strength is increased. The ceramic components can obtain Wrec-1.8J/cm3 energy storage density under a direct current field of E = 13kV/mm, and the energy efficiency eta can reach 80 %; and meanwhile, the material has good temperature stability of energy storage performance.

A ferroelectric thin film element comprises a substrate and an epitaxial ferroelectric thin film provided on the substrate. The thin film satisfies z/z₀>1.003 and 0.997≦x/x₀≦1.003, where a crystal face of said thin film parallel to a crystal face of a surface of the substrate is taken as a Z crystal face, a face spacing of the Z crystal face is taken as z, a face spacing of the Z crystal face of a material constituting the thin film in a bulk state is taken as z₀, a crystal face of the thin film perpendicular to the Z crystal face is taken as an X crystal face, a face spacing of the X crystal face is taken as x and a face spacing of the X crystal face of the material constituting the thin film in a bulk state is taken as x₀.

A brightness-enhancing integral polarizer and optical film structure and manufacture are described. The brightness-enhancing integral polarizer and optical film have an absorptive polarizer and a reflective polarizer. The reflective polarizer generates a reflective light source effect, and uses a nonlinear optic design to coat a brightness-enhancing integral polarizer and optical film with a different dye on at least one substrate and produce the effects of brightness enhancement, high polarization, high transmittance, wide viewing angle and high contrast for the brightness-enhancing integral polarizer and optical film structure and manufacturing method.

The invention discloses an NBT/PVDF three-layer structured composite material for energy storage and a preparation method of the NBT/PVDF three-layer structured composite material for the energy storage. NBT particle powder is prepared through a ball-milling method; PVDF is divided into three parts which are respectively dissolved in a solvent to obtain three PVDF solutions; the NBT particle powder is divided into two parts and respectively added to two PVDF solutions to obtain two NBT/PVDF stock solutions; the NBT/PVDF stock solutions, the PVDF solutions and the NBT/PVDF stock solutions are laminated and subjected to tape casting on a glass substrate sequentially by using a multi-layer tape casting process. A middle layer of the composite material is a pure PVDF polymer, and the two layers of the upper and lower layers are NBT/PVDF composite layers, dielectric ceramic particles are added in an upper-lower two-layer structure, the polarization intensity and energy storage density are used, and the middle layer uses the pure PVDF polymer to obtain high breakdown field strength.

The invention discloses a multiferroic Bi(0.98-x)Sr0.02RExFe0.97Mn0.03O3-CuFe2O4 composite film and a preparation method thereof. The composite film comprises Bi(0.98-x)Sr0.02RExFe0.97Mn0.03O3 crystal films and CuFe2O4 crystal films which are composited together. The preparation method comprises the following steps: firstly, preparing a Bi(0.98-x)Sr0.02RExFe0.97Mn0.03O3 precursor solution and a CuFe2O4 precursor solution respectively; secondly, preparing multiple layers of CuFe2O4 films on a substrate by spin coating, and preparing multiple layers of Bi(0.98-x)Sr0.02RExFe0.97Mn0.03O3 films on the CuFe2O4 films by spin coating to obtain a target product. The equipment requirement is simple, the uniformity of the prepared film is high, the doping amount is easy to control, the ferroelectric and ferromagnetic properties of the film are improved, and the leakage current density of the film is effectively reduced.

The invention discloses an SrTiO<3>-based lead-free high-energy-density ceramic material and a preparation method thereof, and belongs to the technical field of material preparation. According to the method, firstly, 10 to 30 mol percent of Na<0.5>Bi<0.5>TiO<3> powder is added into SrTiO<3> powder to form a mixture; the mixture is subjected to ball milling and drying to obtain dried materials; then, the dried materials are sequentially granulated and sieved to form granulation materials; the granulation materials are made into test specimens; then, sintering is performed to obtain sintering test specimens; grinding and cleaning are performed on the obtained sintering test specimens; the front side and the back side of the ground and cleaned sintering test specimens are uniformly coated with silver electrode slurry; then, sintering is performed; and (1-x)SrTiO<3>-xNa<0.5>Bi<0.5>TiO<3> ceramics are obtained. The high-energy-density ceramic material obtained by using the method provided by the invention has the advantages that the preparation process is simple; the material cost is low; and the mass production can be realized, so that an effective path is provided for the application of the high-energy-density ceramic material.

A spin transfer torque (STT) device has a free ferromagnetic layer that includes a Heusler alloy layer and a template layer beneath and in contact with the Heusler alloy layer. The template layer may be a ferromagnetic alloy comprising one or more of Co, Ni and Fe and the element X, where X is selected from one or more of Ta, B, Hf, Zr, W, Nb and Mo. A CoFe nanolayer may be formed below and in contact with the template layer. The STT device may be a spin-torque oscillator (STO), like a STO incorporated into the write head of a magnetic recording disk drive. The STT device may also be a STT in-plane or perpendicular magnetic tunnel junction (MTJ) cell for magnetic random access memory (MRAM). The template layer reduces the critical current density of the STT device.

The invention belongs to the technical field of physico-chemical material preparation, and relates to a chemical preparation method of a Bi4LaTi3FeO15 multiferroic film. The method is characterized in that single-layer magnetic octahedral group LaFeO3 is inserted into three-layer of layered perovskite-type ferroelectric Bi4Ti3O12 to form a novel four-layer layered perovskite-type Bi4LaTi3FeO15 multiferroic film. According to the method of the invention, a Bi4LaTi3FeO15 precursor sol is firstly prepared by a chemical preparation method, and then is deposited on a clean substrate of (111)Pt/Ti/SiO2/Si(100) directly to form a wet film; and annealing treatment in O2 atmosphere is carried out in a rapid heat treatment furnace. The method is simple in required equipment, low in cost, compatible with microelectronic technology and process, and suitable for industrial production. The prepared Bi4LaTi3FeO15 multiferroic film is pure in phase, good in ferroelectric properties, and quite beneficial to application and popularization of Bi4LaTi3FeO15 multiferroic films.

A functionalized active-nucleus complex sensor that selectively associates with one or more target species, and a method for assaying and screening for one or a plurality of target species utilizing one or a plurality of functionalized active-nucleus complexes with at least two of the functionalized active-nucleus complexes having an attraction affinity to different corresponding target species. The functionalized active-nucleus complex has an active-nucleus and a targeting carrier. The method involves functionalizing an active-nucleus, for each functionalized active-nucleus complex, by incorporating the active-nucleus into a macromolucular or molecular complex that is capable of binding one of the target species and then bringing the macromolecular or molecular complexes into contact with the target species and detecting the occurrence of or change in a nuclear magnetic resonance signal from each of the active-nuclei in each of the functionalized active-nucleus complexes.