Method for preparing ferrite epitaxial film with room temperature broadband large magnetocapacitance effect

Abstract

The invention relates to a method for preparing a ferrite epitaxial thin film with an indoor temperature broadband big magnetocapacitance effect. The method comprises the first step of preparing the ferrite, wherein the component of the ferrite is represented by AFe12-xMxO19, A is one or more of Ba element or Sr element, M is one or more of Sc element, Mg element or Cr element, x is content of the M, and the range of the x is : 0<x<=4; the second step of conducting bombardment on the ferrite using pulse laser in a vacuum background, conducting precipitation of the bombarded ferrite material on a substrate, and growing the ferrite epitaxial thin film on the substrate, wherein the substrate is one of monocrystal Si substrate, Si / Pt substrate, monocrystal Al2O3 substrate and monocrystal SrTiO3 substrate; the third step of conducting cooling treatment on the ferrite epitaxial thin film after the film finishes growing and the fourth step of conducting post annealing treatment on the ferrite epitaxial thin film. The prepared ferrite epitaxial thin film has the indoor temperature broadband big magnetocapacitance effect, and makes up insufficiency of current single-phase magnetocapacitance film materials which have weak indoor temperature magnetocapacitance effect and a narrow frequency domain.

Description

technical field [0001] The invention relates to a magnetic capacitance thin film material, in particular to a method for preparing a ferrite epitaxial thin film with room temperature broadband and large magnetic capacitance effect. Background technique [0002] Magnetocapacitance effect (Magnetocapacitance effect) refers to the phenomenon that the capacitance or dielectric constant of the material changes under the external magnetic field. Materials with magnetocapacitive effects can have important applications in electromagnetic devices such as magnetic field detectors, smart filters, and magnetic field controllers. [0003] Materials with magnetocapacitive effects can be divided into single-phase materials and composite materials. Among them, single-phase materials were the first to be discovered, but so far, most single-phase materials (such as BiMnO 3 etc.) can only be more obvious under the condition of far lower than room temperature (about 100K), which is far from t...

AI Technical Summary

Problems solved by technology

The reported single-phase thin film materials with large magnetocapacitive effect at room temperature mainly include BiFeO 3 , SnO 2 and Cr 2 o 3 and other materials, but the large magnetocapacitive effects of these thin film materials can only appear in the low frequency range

Therefore, at present, there are very few single-phase thin film materials with room temperature large magnetocapacitance effect and broadband characteristics, and single-phase epitaxial thin film materials with the above characteristics have not been reported.

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