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Half-metallic multiferroic superlattice material

A half-metal and superlattice technology, applied in polycrystalline material growth, single crystal growth, crystal growth, etc., can solve problems such as weak magnetoelectric coupling and weak magnetism

Active Publication Date: 2019-05-21
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current research on composite multiferroic materials, there are still problems of weak magnetism and weak magnetoelectric coupling.

Method used

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  • Half-metallic multiferroic superlattice material
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Embodiment Construction

[0012] In order for those skilled in the art to better understand the present invention, the present invention will be further described below in conjunction with specific examples, but the present invention is not limited to the following examples.

[0013] 1) Based on ABO 3 In the perovskite material system, BCO and LSMO are periodically stacked along the [001] direction, and a new type of semi-metallic multiferroic superlattice material is invented. Its crystal structure is as follows: figure 1 shown.

[0014] 2) In order to achieve semi-metallicity, the interface configuration was designed, and through the calculation of the formation energy, it was found that the formation energy of the designed superlattice was -8.52eV, indicating that the material may be prepared using the existing heterojunction Technology acquired.

[0015] 3) The theoretical calculation of the electronic structure of the superlattice shows that it has semi-metallic properties and the spin polarizab...

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Abstract

The invention discloses a half-metallic multiferroic superlattice material and relates to the field of novel functional materials. La0.67Sr0.33MnO3 and BiCoO3, the crystal structures of which are of tetragonal structures and the space groups of which are P4mm, are circularly stacked in a [001] direction to construct (BiCoO3)1 / (La0.67Sr0.33NnO3)1 superlattices. The lattice parameters of the superlattices are as shown in a formula. The electron structure of the superlattice material has a half-metallic characteristic, namely, band gaps appear at Fermi levels of minority of spinon bands and majority of spinon bands have the metallic characteristic, the superlattice material has 100% spin polarization, and the half-metallic band gap is greater than 1.0eV. The superlattice material designed bythe invention not only is multiferroic, but also is half-metallic, and has an important application prospect in the fields of spinning electron devices, information storage, magnetoelectric sensing and the like.

Description

Technical field: [0001] The invention relates to the field of novel functional materials, in particular to a novel semi-metallic multiferroic superlattice material (BiCoO 3 ) 1 / (La 0.67 Sr 0.33 MnO 3 ) 1 . Background technique: [0002] Multiferroic materials have two or more ferroic orders at the same time, such as ferroelectricity, ferroelasticity, and ferromagnetism. In multiferroic materials, due to the mutual coupling between ferroelectricity and ferromagnetism, it is possible to realize the regulation of magnetic properties by electric field or the regulation of electrical properties by magnetic field. This has great potential applications in fields such as multi-state memory devices and electric field-tuned spintronic devices. [0003] In recent years, composite multiferroic materials have been developed rapidly. Such as PbTiO 3 In the / Fe / Au / Fe heterotunnel junction, due to the interfacial magnetoelectric effect, under different polarization states, PbTiO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/68C30B29/22C30B23/00
Inventor 张铭张威王朝崔艳雷李雪伟李鹏飞王如志严辉
Owner BEIJING UNIV OF TECH
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