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Determination method of optimal DC bias magnetic field value based on DC bias magnetic field

A technology of DC bias and determination method, which is applied in the field of materials and sensing, and can solve the problems of single material system and application scenario, the size of the optimal bias magnetic field is not universal, etc.

Active Publication Date: 2020-02-04
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, most of the research on improving the magnetoelectric effect of materials by using DC magnetic field bias only focuses on a single material system and application scenario, and analyzes based on the experimental results. Therefore, the optimal bias magnetic field size selected in different systems does not have universal suitability

Method used

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  • Determination method of optimal DC bias magnetic field value based on DC bias magnetic field
  • Determination method of optimal DC bias magnetic field value based on DC bias magnetic field
  • Determination method of optimal DC bias magnetic field value based on DC bias magnetic field

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Embodiment 1

[0062] A theoretical model design that uses a DC bias magnetic field to effectively enhance the magnetoelectric effect of materials. Taking a specific ferromagnetic material as an example, a single-domain energy model of the ferromagnetic material is established to determine the optimal DC magnetic field bias for enhancing the magnetoelectric effect.

[0063] Amorphous or nanocrystalline metal ferromagnetic materials have great magnetoelastic coupling properties, high magnetic susceptibility, and are easy to process, and are commonly used in ferromagnetic material applications. Among films, tapes and bulk materials, tapes are the most versatile. Example 1 mainly takes Metglas, a strip-shaped amorphous metal material, as an example. The main elements contained in this material are Fe, B, Si, and C, which are used as ferromagnetic phases when building an energy model to study the best DC bias magnetic field .

[0064] figure 1 The coordinate relationship of each physical quan...

Embodiment 2

[0077] On the basis of Example 1, the relevant parameters are calculated by using the numerical calculation method, and the relationship between the magnetization angle and the material strain caused by the external force can be obtained. In the case of a small external bias magnetic field, the magnetization angle and axial strain ε zz relationship such as figure 2 . When the applied bias magnetic field is small, the bias magnetic field can excite the magnetization and rotate the magnetic domains towards the axial direction. In the case of a large external bias magnetic field, the magnetization angle and axial strain ε zz relationship such as image 3 . When the applied bias magnetic field is large, when the strain is zero, the magnetization angle remains at 0, and as the external pulling force increases, the magnetization angle will jump accordingly. At this time, the strain generated by the external force is enough to activate the magnetic domain flipping, and the m...

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Abstract

A determination method of an optimal DC bias magnetic field value based on a DC bias magnetic field comprises the following steps in sequence: determining the magnetization of a material in a steady state in the DC bias magnetic field by using a principle of minimum energy, establishing a single domain physical model, using a numerical calculation method to determine the steady state of the material under the DC bias magnetic field, and determining the magnitude of the DC bias magnetic field when the sensitivity of a device reaches optimal. The determination method has the beneficial effect that for different types of materials, anisotropy constants K and MD of the materials also can affect the selection of the optimal DC bias magnetic field, and analysis can be performed by the same method.

Description

technical field [0001] The invention relates to the field of materials and sensing, in particular to a method for determining an optimal DC bias magnetic field value based on a DC bias magnetic field. Background technique [0002] The magnetoelectric effect is a phenomenon in which the electrical polarization properties of materials change with an applied magnetic field (positive magnetoelectric effect) or the magnetic properties of materials change with an applied electric field (inverse magnetoelectric effect). Magnetoelectric materials are composed of ferromagnetic materials and ferroelectric materials through strain adjustment. The magnetostrictive effect of ferromagnetic materials and the piezoelectric effect of ferroelectric materials are coupled through strain to make materials have magnetoelectric effects. Because magnetoelectric materials can realize mutual conversion between electric field energy and magnetic field energy, this material has broad application prosp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/12
CPCG01R33/1253
Inventor 何金良胡军韩志飞薛芬张波余占清曾嵘李琦庄池杰
Owner TSINGHUA UNIV
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