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Soft magnetic powder and composite magnetic material using same

A soft magnetic powder, magnetic material technology, applied in the field of composite magnetic materials, can solve the problem of ineffective anti-noise measures

Inactive Publication Date: 2002-08-07
TOKIN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the signal path itself acts like a component with a lumped constant in a high-speed integrated electronic component or a wiring board, because the noise generated involves harmonic components
Therefore, general noise immunity measures based on circuits with lumped constants have become ineffective

Method used

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  • Soft magnetic powder and composite magnetic material using same
  • Soft magnetic powder and composite magnetic material using same
  • Soft magnetic powder and composite magnetic material using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Three kinds of Fe-Al-Si alloy powders with different specific surface areas were prepared using the above compositions. The specific surface areas of these samples measured by the BET method were 0.67 m 2 / g, 1.33m 2 / g and 0.17m 2 / gram.

[0055] figure 1 It shows that the specific surface area is 0.67 meters 2 Particle diameter distribution of Fe-Al-Si alloy powder per gram. The particle diameter distribution curve shown in the figure has a maximum without any other peaks and valleys, which indicates that the alloy powder has a single mode particle diameter distribution. The particle diameter distribution curves of other alloy powders also show similar patterns. By analyzing the powder, it can be considered that the surface of the alloy powder particles contains excess iron compared with the bulk composition of the raw material.

[0056] These alloy powders were formed into composite magnetic material sheets by the above-mentioned method in order to evaluate th...

Embodiment 2

[0067] An example using Fe-Ni alloy powder as the soft magnetic powder will be described below. In the present embodiment, the same method as in embodiment 1 is adopted, and the specific surface areas are respectively 0.13 m 2 / g, 0.47m 2 / g and 0.61 m 2 / g of alloy powder containing flat particles to prepare a composite magnetic material. All powders confirmed a single mode particle diameter distribution curve.

[0068] For convenience, the specific surface area will be 0.13 m 2 / g, 0.47m 2 / g and 0.61 m 2 The samples per gram of alloy powder are called No. 4, No. 5 and No. 6 samples respectively.

[0069] exist Image 6 , 7 and 8 show the evaluation results of the magnetic permeability characteristics of samples Nos. 4, 5 and 6, respectively, and these results will be discussed below. Using sample No. 4 with an alloy powder having a relatively small specific surface area, only one resonance point was observed, while samples No. 5 and 6 using alloy powders with a rel...

Embodiment 3

[0071] The flat-shaped magnetic powders described in Examples 1 and 2 were used. However, since the expression of two magnetic resonance points is believed to be due to the magnetic anisotropy of the powder particle surface, the same phenomenon can be expressed when the powder contains non-flat particles. This embodiment is described below. Magnetite (Fe 3 o 4 ) powder as magnetic powder. Also used has a specific surface area of ​​0.20 m 2 / g and 1.3m 2 / g of magnetic powder, and the samples containing the composite magnetic material prepared as described in Example 1, these samples are called No. 7 sample and No. 8 sample respectively.

[0072] Depend on Figure 9 and 10 The evaluation results of the magnetic permeability characteristics of samples No. 7 and No. 8 are shown, and it can be seen that the sample using magnetic powder having a relatively small specific surface area expresses two resonance points, although the powder has a single-mode particle diameter dist...

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Abstract

The present invention provides an electromagnetic interference suppressing material for obtaining wide band electromagnetic suppressing effect in high frequency regions by permitting a composite magnetic material comprising a soft magnetic powder and a binder to express two magnetic resonances. In the composite magnetic material, the specific surface area of the soft magnetic material is maintained at a prescribed level to exhibit mutually different intensities of two anisotropic magnetic fields.

Description

technical field [0001] The present invention relates to magnetic materials having excellent magnetic loss characteristics in the high frequency range. More particularly, the present invention relates to soft magnetic materials having excellent complex permeability characteristics effective in suppressing extraneous radiation, which is a problem in high-frequency electronic parts and electronic devices, and to using the soft magnetic material composite magnetic material. Background technique [0002] Highly integrated semiconductor elements that can operate at high speeds are extremely widely used. Examples of such elements include random access memory (RAM), read only memory (ROM), microprocessor (MPU), and central processing unit (CPU). [0003] Computing speed and signal processing speed are handled continuously in these active elements. Since the electrical signals emitted by high-speed electronic circuits are accompanied by large voltage and current fluctuations, they...

Claims

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Application Information

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IPC IPC(8): B22F1/00C01G49/00H01F1/20H01F1/24H01F1/36H01F1/37H05K1/02H05K9/00
CPCH01F1/37H01F1/20H05K1/0233H01F1/36H01F1/24
Inventor 吉田荣吉安藤慎辅
Owner TOKIN CORP
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