Single-phase oxide multiferroic ceramic with exchange bias effect and preparation method thereof

A technology of multiferroic ceramics and bias effect, which is applied in the field of magnetoelectric mutual control nonvolatile storage, can solve problems such as restricting magnetoelectric coupling performance, and achieve the effect of low cost and simple preparation

Active Publication Date: 2015-07-08
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, there are co-firing matching and interfacial diffusion between the composite phases, which restrict the magnetoelectric coupling performance of the material; in addition, the elastic strain / stress coupling between the piezoelectric effect of the ferroelectric phase and the magnetostrictive effect of the ferromagnetic phase Energy loss is unavoidable in the process, so researchers hope to find single-phase materials with exchange bias phenomenon

Method used

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  • Single-phase oxide multiferroic ceramic with exchange bias effect and preparation method thereof
  • Single-phase oxide multiferroic ceramic with exchange bias effect and preparation method thereof
  • Single-phase oxide multiferroic ceramic with exchange bias effect and preparation method thereof

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preparation example Construction

[0028] The present invention also provides a corresponding preparation method for the above-mentioned multiferroic ceramic material, comprising the following steps: A) mixing titanate compounds, bismuth source compounds, iron source compounds and cobalt source compounds in a solvent according to the ratio of metal ions, and The mixture is mixed, evaporated to dryness and burned into powder, and the powder is obtained after pre-calcination;

[0029] B) Pressing the powder into tablets and sintering to obtain the multiferroic ceramics.

[0030] In order to clearly illustrate the present invention, the experimental processes of step A and step B are described in detail below respectively.

[0031] The step A is specifically: dissolving the bismuth source compound, iron source compound, cobalt source compound and titanate compound in the solvent according to the molar ratio of metal ions, adding a complexing agent, mixing and stirring to obtain a clear solution, heating and evapor...

Embodiment 1

[0044] According to the purity of each raw material listed in Table 1 and its weighing amount, get chemically pure n-butyl titanate (C 16 h 36 o 4 Ti), analytically pure bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O), analytically pure ferric nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) and analytically pure cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 (0) is raw material, after being accurately weighed according to molar ratio 3:10:5.9:0.1, be dissolved in 100mL mass percent concentration and be 80% nitric acid aqueous solution, add the complexing agent that is made up of ethylenediaminetetraacetic acid and citric acid, its The amount to be added is such that the molar ratio of ethylenediaminetetraacetic acid and citric acid in the complexing agent to the metal ions contained in the solution is 0.6:1:1, and stirred at a constant speed until a clear solution is formed.

[0045] Prepare Bi in the embodiment 1 of table 1 10 Fe 5.9 co 0.1 Ti 3 o 30 Raw materials a...

Embodiment 2

[0054] Using the same preparation method and experimental conditions in Example 1, synthesize Bi 10 Fe 5.9 co 0.1 Ti 3 o 30 sample.

[0055] The hysteresis loops of samples cooled to 100K in zero field and 100K in a magnetic field of 2 kOe were measured by Dynacool comprehensive physical property measurement system (PPMS) produced by Quantum Design Company in the United States. Under the cooling of the magnetic field of 2kOe, the hysteresis loop of the sample shifted, which has the effect of exchange bias. The exchange bias field is H E =1115Oe, the coercive field is H C =2019Oe.

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Abstract

The invention provides a single-phase oxide multiferroic ceramic with exchange bias effect. The single-phase oxide multiferroic ceramic is as shown in the formula (I): Bi10Fe5.9Co0.1Ti3O30 (I). The single-phase oxide multiferroic ceramic has high Curie temperature, has ferroelectricity and ferromagnetism under the room temperature at the same time, and has intrinsic exchange bias effect. Not only a magnetic field can be regulated and controlled, but also an electric field can be regulated and controlled, the possibility of encoding storage information through the adoption of electric polarization and magnetic polarization at the same is provided, and then a magneto-electric mutual-control nonvolatile storage magnetic medium with ultrahigh storage density becomes possible.

Description

technical field [0001] The invention belongs to the technical field of magnetoelectric mutual control nonvolatile storage, and in particular relates to a single-phase oxide multiferroic ceramic with an exchange bias effect and a preparation method thereof. Background technique [0002] The exchange bias effect is a very important physical phenomenon in the study of material magnetism. In 1991, the discovery of the spin valve structure based on the exchange bias effect made giant magnetoresistance materials take a crucial step towards application. Since then, spintronic devices such as magnetic tunnel junction structures have been developed. Today, the exchange bias effect has become an important basis for information storage technology, and is widely used in magnetic read heads, magnetic random access memories, and magnetic sensors. [0003] It is generally believed that the exchange bias effect originates from the exchange coupling effect at the interface between the ferr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622
Inventor 陆亚林黄妍彭冉冉傅正平翟晓芳
Owner UNIV OF SCI & TECH OF CHINA
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