4 results about "Spin filtering" patented technology

The invention provides a CrBr3-based spin filtering magnetic tunnel junction, and belongs to the technical field of spin electronic devices. Two two-dimensional Van der Waals layered materials are adopted for construction, and the specific structure is that metallic 1T-phase multi-layer MoSe2 serves as a non-magnetic NM electrode, semiconductor double-layer CrBr3 serves as a tunnel magnetic barrier layer, and a symmetric sandwich structure of MoSe2 / double-layer CrBr3 / MoSe2 is formed; the lattice matching of the electrode and the barrier layer is realized through a cell expansion stacking design, and the interlayer magnetic coupling state of the double-layer CrBr3 is regulated and controlled through an external magnetic field; the semimetallic property of CrBr3 is induced by utilizing an interface charge transfer effect to form a'spin filter ', so that electrons are freely transported only in a PC state in a spin direction. The MoSe2 / double-layer CrBr3 / MoSe2 sf-MTJ designed by the invention has good application potential in the field of high-speed, low-power-consumption and miniaturized spinning electronic devices.

The invention relates to the technical field of catalysts, in particular to a chiral-metal defect coupling catalyst, a preparation method and application thereof and a preparation method of fuel. The chiral structure and the metal defect structure are coupled and synergistically constructed in the same metal oxide catalyst, so that the chiral-metal defect coupled catalyst has the advantages of the chiral structure and the metal defect structure, and shows excellent catalytic performance in photocatalytic reaction. Wherein the metal defect structure can regulate and control the energy band structure of the metal oxide, improve the visible light absorption capacity, promote the electron-hole separation efficiency and improve the spin photocatalytic reaction activity. A chiral spinning structure can generate a CISS effect, electron-hole recombination is further inhibited, the service life of a carrier is prolonged, a spinning triplet-state reaction intermediate is formed through a spinning filtering effect in a photocatalytic synthesis fuel reaction so as to improve the reaction rate, the fuel substrate conversion rate and the fuel selectivity, and the chiral spinning structure is especially suitable for photocatalytic synthesis of high-density fuel and has a wide application prospect. And the prepared fuel meets the requirements of aerospace.

The invention discloses a design method of a spin thermoelectric conversion and spin filtering electronic device based on a boron and phosphorus doped SiC7 nanobelt. The design method comprises the following steps: (1) establishing single hydrogen atom terminal SiC7 nanobelt one-dimensional primitive cells with different nanobwidths by using software Device Studio; (2) performing geometric structure optimization on one-dimensional primitive cells of the SiC7 nanobelt by utilizing DS-PAW software; (3) calculating the electronic property of the one-dimensional primitive cell of the SiC7 nanobelt by using software Nanodcal; (4) constructing a nano electronic device consisting of three parts, namely a left electrode, a central scattering region and a right electrode, by using a SiC7 nanobelt with the nanobelt width of 9; (5) carrying out atom replacement doping in three modes on the nano electronic device in the step (4); (6) calculating and analyzing transmission spectrums of the four nanobelt devices, and calculating and comparing real space scattering states of the four nanobelt devices to obtain influences of different doping conditions on nanobelt spinning electron transmission conditions; (7) designing the SiC7 nanobelt of which the upper edge is doped with BP atoms and the lower edge is doped with B atoms into a thermoelectric conversion device in a ferromagnetic state; (8) changing the magnetic state of the SiC7 nanobelt of which the upper edge and the lower edge are doped at the same time, calculating a transmission spectrum and a spin polarization current in an antiferromagnetic state, and designing a spin-through device; according to the invention, the application space of the SiC7 material in spintronics is expanded.

This invention provides a visible light responsive titanium dioxide photocatalyst, its preparation method, and its application. The photocatalyst has a core-shell structure or a heterojunction interface structure and includes the following components: matrix material: modified nano-titanium dioxide; modifying material: chiral carbon quantum dots; the chiral carbon quantum dots are grown in situ or grafted onto the surface of the matrix material through Ti-O-C chemical bonds or strong electrostatic interactions; the photocatalyst utilizes the spin filtering effect generated by the CISS effect of the chiral carbon quantum dots, so that the photogenerated electrons injected into the matrix and the remaining holes are in a spin-forbidden state, thereby inhibiting recombination; this invention uses physical laws rather than simple energy level matching to inhibit recombination, significantly improving the quantum efficiency; the long-lived electrons and holes can continuously generate active free radicals, effectively overcoming the difficult-to-degrade VOCs containing benzene ring structures such as toluene, and reducing the generation of intermediate products; the raw materials used are all inexpensive chemical products, free from heavy metal pollution, and suitable for large-scale industrial production.