Magnetoelectric composite material composed of magnetic nanofiber ferroelectric thin film and preparation method thereof

Abstract

The invention proposes a magnetoelectric composite material composed of magnetic nanofibers and ferroelectric thin films and a preparation method thereof. It is in Pt / Ti / SiO 2 / Si or Nb‑SrTiO 3 Preparation of CoFe on substrate by electrospinning method 2 o 4 (CFO) magnetic nanofibers, on which a ferroelectric layer of Pb(Zr,Ti)O was plated by pulsed laser deposition 3 The thin film wraps it, and realizes 1-2 type ferroelectric ferromagnetic recombination. The preparation is completed by preparing the CFO precursor solution, cleaning the substrate, preparing CFO nanofibers by electrospinning, annealing and crystallizing, continuing to grow the ferroelectric material PZT by pulsed laser deposition, and preparing the Pt top electrode. The invention effectively weakens the clamping effect of the rigid substrate, increases the strain transfer area between the ferroelectric material and the ferromagnetic material, and enhances the magnetoelectric coupling effect. The magnetoelectric composite film prepared by the method of the invention has a magnetoelectric coupling coefficient of up to 320mV / 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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