Stack ferro-electricity /magnetic multiferrou magnetoelectric compound film with conductive oxide as buffer layer and preparation thereof

Abstract

The invention discloses laminated ferroelectric/magnetic multiferroic and magnetoelectric composite film and preparation method thereof. The film comprises a substrate, a ferroelectric oxide layer and a magnetic oxide layer, and also a buffer layer positioned between the substrate layer and the ferroelectric oxide layer or the magnetic oxide layer. The layer can be LaNiO3, YBa2Cu3O7-x or SrRuO3, among which LaNiO3 is preferred. The preparation method comprises the following steps: firstly, buffer layer sol is prepared; secondly, the buffer layer sol is uniformly coated on the substrate to obtain the buffer layer; thirdly, sol of the ferroelectric oxide layer and the magnetic oxide layer is respectively prepared; fourthly, the sol obtained in step 3 is coated on the buffer layer, and then the end product is obtained. After the composite film is introduced into the buffer layer, the stress restraint of the substrate to the composite film is effectively reduced, the magnetoelectric coupling performance of the composite film with laminated structure is obviously enhanced, the cost is reduced, the preparation technique is simple, the requirement on the equipment is low, and the compatibility with the prior technique is good.

Description

technical field [0001] The invention relates to a laminated ferroelectric / magnetic multiferroic magnetoelectric composite film and a preparation method thereof, in particular to a laminated ferroelectric / magnetic multiferroic magnetoelectric composite film using conductive oxide as a buffer layer and its Preparation. Background technique [0002] Ferroic materials (such as ferroelectric and ferromagnetic materials) are a large class of very important advanced functional materials, which can be widely used in electronic devices such as transducers, sensors, and sensors. High-tech areas such as systems dominate. In modern life and production with miniaturization of devices and diversified demands, there is an increasingly urgent need for materials with multiple functions at the same time, and multiferroic materials are a typical representative of them. Multiferroic materials have ferroelectricity, ferromagnetism and other ferroic properties at the same time, and due to the c...

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Problems solved by technology

[0008] The existing layered magnetoelectric composite thin films mostly use PLD method and sol-gel method on SrTiO 3 Deposited on a single crystal substrate or a Si substrate with a Pt electrode, due to the constraints of the substrate, the magnetoelectric properties of the composite film are poor (DengC Y, Zhang Y, Ma J, et al.Magnetic-electric properties of epitaxial multiferroicNiFe 2 o 4 -BaTiO 3 heterostructure. Journal of Applied Physics, 2007, 102(7): 074114; He HC, Ma J, Wang J, et al. Orientation-dependent multiferroic properties in Pb(Zr 0.52 Ti 0.48 )O 3 -CoFe 2 o 4 nanocomposite thin films derived by a sol-gel processing. Journal of Applied Physics, 2008, 103(3): 034103; He H C, Wang J, Zhou B P, et al. Ferroelectric and ferromagnetic behavior of Pb(Zr 0.52 Ti 0.48 )O 3 -Co 0.9 Zn 0.1 Fe 2 o 4 multilayeredthin films prepared via solution processing. Advanced Functional Materials, 2007, 17(8): 1333-1338)

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