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Magnetic substance with maximum complex permeability in quasi-microwave band and method for production of the same

A complex magnetic permeability, material technology, applied in the field of electromagnetic interference magnetic material, can solve the problem of inability to effectively suppress high-frequency noise, etc.

Inactive Publication Date: 2002-08-21
TOKIN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] On the other hand, using a lumped constant circuit cannot effectively suppress high-frequency noise caused in a circuit using high-speed operating electronic devices, because the frequency of the noise increases, so that the circuit line actually functions as a distributed constant circuit

Method used

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  • Magnetic substance with maximum complex permeability in quasi-microwave band and method for production of the same
  • Magnetic substance with maximum complex permeability in quasi-microwave band and method for production of the same
  • Magnetic substance with maximum complex permeability in quasi-microwave band and method for production of the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0041] Under the sputtering conditions shown in Table 1, use Figure 2A M-X-Y magnetic composite thin films were formed on a glass plate using the sputtering device shown in .

[0042] Vacuum before sputtering

-6 support

atmosphere

Ar gas

power supply

RF

Target

Fe (diameter 100nm) and Al 2 o 3 Sliced ​​(120 pieces)

(Slice size: 5mm×5mm×2mm)

[0043] The resulting thin film sample 1 was analyzed by fluorescence X-ray spectroscopy and confirmed to be the synthetic Fe72 Al 11 o 17 film. Film sample 1 has a thickness of 2.0 micrometers (μm), a DC resistivity of 530 microohm centimeters (μΩ·cm), an anisotropy field (Hk) of 18 Oe (Oersted), and a saturation magnetization (Ms) of 16,800 gauss.

[0044] The percentage {Ms(M-X-Y) / Ms(M)}×100 of the saturation magnetization of the thin film sample 1 to the saturation magnetization of the metal material M itself was 72.2%.

[0045] To measure the magnetic perm...

example 2

[0046] Similar to example 1 but using 150Al 2 o 3 Thin film sample 2 was formed on a glass plate under sectioning conditions.

[0047] The resulting thin film sample 2 was analyzed by fluorescence X-ray spectroscopy and confirmed to be the composite Fe 44 Al 22 o 34 film. Film sample 2 has a thickness of 1.2 micrometers (μm), a DC resistivity of 2400 microohm centimeters (μΩ·cm), an anisotropy field (Hk) of 120 Oe, and a saturation magnetic field strength (Ms) of 9600 Gauss. Note that film sample 2 has a higher resistivity than film sample 1.

[0048] The percentage {Ms(M-X-Y) / Ms(M)}×100 of the saturation magnetization of the thin film sample 2 to the saturation magnetization of the metal material M itself was 44.5%.

[0049] The μ "-f response of film sample 2 was also obtained in a manner similar to Example 1 and shown in Figure 4 . Note that this peak also has a high value similar to Example 1. However, the frequency point at the peak, or the natural response freq...

example 9

[0078] Under the sputtering conditions shown in Table 12, use Figure 2A M-X-Y magnetic composite thin films were formed on a glass plate using the sputtering device shown in . The film was heat-treated under a magnetic field at a temperature of 300° C. in vacuum for 2 hours to obtain a film sample 9 .

[0079] Vacuum before sputtering

-6 support

atmosphere

Ar gas

power supply

RF

Target

Fe (diameter 100mm) and TiO 2 Slices (150

slice) (Slice size: 5mm×5mm×2mm)

[0080] The properties of Film Sample 9 are shown in Table 13.

[0081] membrane thickness

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Abstract

A magnetic substance having the maximum value of complex permeability in quasi-microwave range is provided for suppressing a high frequency noise in a small-sized electronic apparatus. The magnetic substance is of a magnetic composition comprising M, X and Y, where M is a metallic magnetic material consisting of Fe, Co, and / or Ni, X being element or elements other than M and Y, and Y being F, N, and / or O. The M-X-Y magnetic composition has a concentration of M in the composition so that said M-X-Y magnetic composition has a saturation magnetization of 35-80 % of that of the metallic bulk of magnetic material comprising M alone. The magnetic composition has the maximum mu 'max of complex permeability mu ' in a frequency range of 0.1-10 gigahertz (GHz).

Description

[0001] technical field of invention [0002] The present invention relates to a magnetic substance for suppressing or absorbing high-frequency noise in electric or electronic devices, especially a magnetic substance suitable for suppressing electromagnetic interference (EMI) caused in active electronic devices, high-frequency circuit components and high-frequency electronic devices . technical background [0003] It is known in the art to attach a cylindrical ferrite core to a power cord connected to an electronic device, such as a computer, to suppress high frequency noise flowing into or out of the computer through the power cord. The ferrite core absorbs high frequency noise currents flowing through the power line. Compared with the rapid miniaturization of electronic devices with high density placement of electronic circuit components, the volume of ferrite cores used is too large. [0004] It is also known in the art to have lumped constant circuits (such as decoupling ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F10/14H01F1/00H01F1/33H01F10/00H01F41/30H05K9/00
CPCH01F41/301H01F10/007H01F1/0063H05K9/0083B82Y25/00H05K9/0084H01F1/33B82Y40/00H01F1/00
Inventor 吉田荣吉小野裕司安藤慎辅李卫东岛田宽
Owner TOKIN CORP