Bi0.90Dy0.10Fe1-XMnxO3 ferroelectric film with high dielectric constant, and preparation method for Bi0.90Dy0.10Fe1-XMnxO3 ferroelectric film with high dielectric constant

Abstract

The invention provides a Bi0.90Dy0.10Fe1-XMnxO3 ferroelectric film with a high dielectric constant, and a preparation method for the Bi0.90Dy0.10Fe1-XMnxO3 ferroelectric film with the high dielectric constant. The film adopts a rhombohedral structure and has high homogeneity, the remanent polarization ranges from 59.3 [mu]C / cm<2> to 95.2 [mu]C / cm<2>, the coercive field ranges from 280 kV / cm to 368 kV / cm, and the high dielectric constant ranges from 239.2 to 348.57. The preparation method includes the following steps: bismuth nitrate, ferric nitrate, dysprosium nitrate and manganese acetate are dissolved in a mixed liquor of ethylene glycol monomethyl ether and acetic anhydride, so as to obtain a precursor; a substrate is spin-coated with the precursor; glue evening and baking are carried out in sequence to obtain a dry film; the dry film is annealed to obtain a Bi0.90Dy0.10Fe1-XMnxO3 film; the procedures of precursor spin-coating, baking and annealing are repeated until a required film thickness is reached, so that the film is obtained. The ferroelectric film has the advantages of simple equipment requirements and high controllability of the doping amount; the dielectric properties of a BiFeO3 (bismuth ferrite) film can be greatly improved.

Description

technical field

[0001] The invention belongs to the field of functional materials, in particular to a high dielectric constant Bi 0.90 Dy 0.10 Fe 1-x mn x o 3 Ferroelectric thin film and its preparation method. Background technique

[0002] BiFeO 3 It is currently the only ferroelectric that has both ferroelectricity and G-type-weak ferromagnetism at room temperature, and has a high ferroelectric Curie temperature (T C ~1023K) and antiferromagnetic Neel temperature (T N ~643K). The coexistence of magnetism and ferroelectricity in BFO makes the multiferroic material not only can be used as a single ferroelectric material or magnetic material, but also the coupling effect of magnetism and electricity in the material makes the electric field in the material can induce magnetization, and the magnetic field can induce polarization. This feature has an attractive application prospect in the new memory element of magnetic reading and writing. For example, a magnetoelectri...

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