Magneto-electric composite material compounded by magnetic nano-fibers and ferroelectric film and preparation method thereof

Abstract

The invention puts forward a magneto-electric composite material compounded by magnetic nano-fibers and a ferroelectric film and a preparation method thereof. CoFe2O4(CFO) magnetic nano-fibers are prepared on a Pt / Ti / SiO2 / Si or Nb-SrTiO3 substrate by an electrostatic spinning method, and a ferroelectric layer Pb(Zr, Ti)O3 film is plated on the CoFe2O4(CFO) magnetic nano-fibers by a pulse laser deposition method to coat the CoFe2O4(CFO) magnetic nano-fibers, so that the 1-2 type ferroelectric-ferromagnetic composite is realized. The preparation method comprises the following steps of: preparingCFO precursor solution; cleaning a substrate; preparing CFO nano-fibers by the electrostatic spinning method; annealing crystallization; continuously growing a ferroelectric material PZT by the pulselaser deposition method; and preparing a Pt top electrode and the like. Through adoption of the magneto-electric composite material and the preparation method of the invention, a clamping effect of arigid substrate is effectively weakened, a strain transfer area of a ferroelectric material and a ferromagnetic material is enlarged, and a magneto-electric coupling effect is enhanced; in addition,a magneto-electric coupling coefficient of a magneto-electric composite film prepared by the method can reach 320 mV / Oe*cm.

Description

technical field [0001] The invention belongs to the field of thin-film magnetoelectric materials, and relates to a magnetoelectric composite material composed of magnetic nanofiber ferroelectric thin films and a preparation method thereof. Background technique [0002] The magnetoelectric coupling effect is a phenomenon in which materials are magnetized (electrically polarized) under the action of an electric field (magnetic field). Because multiferroic magnetoelectric composite materials have both ferroelectricity, ferromagnetism and ferroelasticity, they can not only be used in the technical field of single ferromaterials, but also in the fields of new magneto-electric sensor devices, spintronic devices, and new information storage. Show great application prospects. [0003] According to the different composite methods of ferroelectric phase and ferromagnetic phase, it is mainly divided into 0-3 type particle mosaic composite material, 2-2 type laminated composite materia...

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Problems solved by technology

At present, for the 0-3 type particle mosaic composite structure, it is difficult to obtain a large magnetoelectric coupling coefficient due to the limited volume percentage of the ferromagnetic phase and a certain degree of leakage current; the 2-2 type connection method It is a heterojunction, double-layer film, or two-phase alternate multilayer film formed by depositing one film on another film or sheet. The 2-2 type interlayer composite magnetoelectric film will be limited by the substrate clamping effect; the 1-3 type magnetoelectric composite structure is a magnetoelectric composite film formed by dispersing ferromagnetic nanocolumns in a ferroelectric material matrix in a manner perpendicular to the film plane. This type of composite material also has leakage current and iron The volume fraction of the magnetic phase is limited, and there are problems such as difficult preparation, difficult to control the microstructure of the film, and high production costs.

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