Preparation Of Co₂Z Hexagonal Ferrite And Research On Magnetoelectric Effect At Room Temperature

Single-phase multiferroic material is a kind of new functional material with a variety of iron order,and its unique magnetoelectric coupling effect provides a new opportunity for the development of next-generation multi-function electronic devices.Co₂Z hexagonal ferrite Sr₃Co₂Fe₂₄O₄₁ is a single-phase and multiferroic material with strong magnetoelectric coupling effect at room temperature and low field.However,the ion substitution research for Co₂Z has little involvement in its multiferroic content.In this paper,polycrystalline Co₂Z ferrite was prepared and the effect of ion substitution on the magnetoelectric coupling effect at room temperature was studied.The conclusions are as follows:Firstly,polycrystalline Co₂Z hexagonal ferrite was prepared by solid state reaction method.The effect of sintering temperature on microstructure and properties of target material was studied.At the sintering temperature of 1100?¹210?,with the increase of the sintering temperature,the main phase of the sample changed from M phase to Z phase and get the highest quality sample at 1200?,the magnetoelectric effect current is relatively large;at the same time,the grain size becomes larger,the coercivity decreased gradually,magnetodielectric effect gradually enhanced.Secondly,the effects of Zn-Ti,Cr and Cu ion substitution on the magnetoelectric coupling effect of Co₂Z hexagonal ferrite were investigated.The phase structure,microstructure,static magnetic properties,magnetoelectric effect current and magneto-dielectric effect of the target materials were studied in detail.Within the scope of inspection,although substitution of Zn-Ti ions reduce the magnetoelectric effect of the material under the scope of the study,it could enhance the magnetiodielectric effect,The maximum magnetodielectric effect occurs in the sample with the substitution amount x=0.1.The magnetodielectric effect of Cr ion substitution system appears to increase first and then decrease,and the maximum magnetodielectric effect appears in the sample of x=0.2.The amount of Cu ions substituted can improve the magnetoelectric effect of the size of the current,the maximum current magnetoelectric effect appeared in the substituted amount of x=0.1.In addition,Cu ion substitution can also enhance the magnetodielectric effect of Co₂Z,the magnetodielectric effect changes with the content showed first increased and then decreased,the maximum magnetodielectric effect appears in the x=0.2 sample.