KR102018305B1 - Magnetic Sheet for High Frequency Application and Method of Fabricating the Same - Google Patents

Magnetic Sheet for High Frequency Application and Method of Fabricating the Same Download PDF

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Publication number
KR102018305B1
KR102018305B1 KR1020140124836A KR20140124836A KR102018305B1 KR 102018305 B1 KR102018305 B1 KR 102018305B1 KR 1020140124836 A KR1020140124836 A KR 1020140124836A KR 20140124836 A KR20140124836 A KR 20140124836A KR 102018305 B1 KR102018305 B1 KR 102018305B1
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KR
South Korea
Prior art keywords
magnetic sheet
permanent magnets
magnetic
high frequency
polarity
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Application number
KR1020140124836A
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Korean (ko)
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KR20160033953A (en
Inventor
김진모
김학관
서정욱
나은혜
김인규
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삼성전기주식회사
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Priority to KR1020140124836A priority Critical patent/KR102018305B1/en
Publication of KR20160033953A publication Critical patent/KR20160033953A/en
Application granted granted Critical
Publication of KR102018305B1 publication Critical patent/KR102018305B1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F10/00—Thin magnetic films, e.g. of one-domain structure
    • H01F10/32—Spin-exchange-coupled multilayers, e.g. nanostructured superlattices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/0302—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions
    • H01F1/0311—Compounds
    • H01F1/0313—Oxidic compounds
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/32—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying conductive, insulating or magnetic material on a magnetic film, specially adapted for a thin magnetic film
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Soft Magnetic Materials (AREA)
  • Hall/Mr Elements (AREA)

Abstract

A magnetic sheet for high frequency is provided. The high frequency magnetic sheet includes a plurality of magnetic sheets having a lateral spin magnetic moment and a plurality of permanent magnets provided in the magnetic sheet and having polarities in at least one specific direction.

Description

Magnetic Sheet for High Frequency and Manufacturing Method Thereof {Magnetic Sheet for High Frequency Application and Method of Fabricating the Same}

The present invention relates to a magnetic sheet and a method of manufacturing the same, and more particularly, to a magnetic sheet for high frequency and a method of manufacturing the same that can be applied to an electronic device used in the high frequency band.

Examples of applications in which magnetic sheets are used include noise suppression applications and radio frequency identification (RFID) applications. Noise suppression applications include electromagnetic waves from the outside of these electronic devices in response to rapid progress in miniaturization and high frequency of electronic devices such as personal computers (PCs) or mobile phones. In order to suppress interference between noise interference and noise generated inside the electronic device, various countermeasures against noise may be mentioned. For example, the provision of a magnetic sheet (i.e., a noise suppression sheet) in the vicinity of the noise source or the noise source has been applied.

The magnetic sheet is a magnetic paint (ie, magnetic sheet composition) containing a magnetic material such as an iron (Fe) -silicon (Si) -aluminum (Al), an epoxy resin, an acrylic resin, and a volatile solvent. ) Is applied to the surface of an insulating support such as polyethylene terephthalate (PET) or exfoliated polyethylene terephthalate, and cured by heat compression to form a sheet. The magnetic body has a function as a so-called noise suppressor, which suppresses noise. The noise suppression effect of the magnetic sheet is higher as the imaginary part of permeability increases.

On the other hand, a coil antenna by an electromagnetic induction method, as represented by a personal digital assistant (PDA) having an integrated circuit tag (IC tag) function called RFID for radio wave identification purposes. Wireless communication using the above method. For example, due to the miniaturization of personal digital assistants, various conductors such as metal cases or metal components are arranged in the vicinity of the antenna components for transmitting and receiving personal digital assistants. In this case, due to the presence of the metal near the antenna component, the magnetic field available for communication is greatly attenuated, the RFID communication distance in the electromagnetic induction method is reduced, or the resonance frequency is shifted, so that the wireless It becomes difficult to transmit and receive frequencies. Therefore, in order to suppress such electronic disturbances, the arrangement of the magnetic sheet between the antenna component and the conductor in the vicinity thereof has been applied. The suppression effect of these magnetic disturbances of the magnetic sheet is higher as the real part of permeability is larger and the imaginary part of permeability is smaller.

The problem to be solved by the present invention is to provide a high frequency magnetic sheet with improved high frequency characteristics.

Another object of the present invention is to provide a method of manufacturing a magnetic sheet for high frequency with improved high frequency characteristics.

If the problem to be solved by the present invention is not limited to the above-mentioned problems, other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the present invention provides a magnetic sheet for high frequency. The magnetic sheet may include a plurality of magnetic sheets having a high-frequency spin magnetic moment in the magnetic sheet and a magnetic sheet having a polarity in at least one specific direction.

The magnetic sheet may include hexagonal iron oxide.

Permanent magnets may be provided to have a constant arrangement.

Permanent magnets may have polarity in the same one particular direction. The same one specific direction may be a direction perpendicular to or parallel to the plane direction of the magnetic sheet. If the permanent magnets have a polarity that is a direction perpendicular to the plane direction of the magnetic sheet, the axial magnetic anisotropy of the magnetic sheet for high frequency can be adjusted. If the permanent magnets have a polarity that is a direction parallel to the plane direction of the magnetic sheet, the plane direction magnetic anisotropy of the high frequency magnetic sheet can be adjusted.

The permanent magnets may have polarities in two specific directions opposite to each other. The polarities, which are two specific directions opposite to each other, may be in a direction perpendicular to or parallel to the plane direction of the magnetic sheet. If the permanent magnets have polarities that are directions perpendicular to the plane direction of the magnetic sheet, the axial magnetic anisotropy of the high frequency magnetic sheet can be adjusted. If the permanent magnets have polarities that are directions parallel to the plane direction of the magnetic sheet, the plane direction magnetic anisotropy of the high frequency magnetic sheet can be adjusted.

Permeability or resonant frequency of the magnetic sheet for high frequency can be adjusted according to the size or length of the permanent magnets.

Moreover, in order to achieve the said another subject, this invention provides the manufacturing method of a high frequency magnetic sheet. The method may include forming a magnetic sheet having a plurality of permanent magnets having a polarity in at least one particular direction therein, the magnetic sheet having a planar spin magnetic moment.

The magnetic sheet may include hexagonal iron oxide.

Permanent magnets may be provided to have a constant arrangement.

Permanent magnets may have polarity in the same one particular direction. The same one specific direction may be a direction perpendicular to or parallel to the plane direction of the magnetic sheet.

The permanent magnets may have polarities in two specific directions opposite to each other. The polarities, which are two specific directions opposite to each other, may be in a direction perpendicular to or parallel to the plane direction of the magnetic sheet.

The size or length of the permanent magnets can be adjusted.

As described above, according to the solution of the present invention, the high-frequency magnetic sheet has flexibility by providing permanent magnets having a polarity in at least one specific direction while having a constant arrangement in the magnetic sheet. It can have, adjust the overall magnetic field direction, secure the target permeability, have a high resonant frequency, and induce a large spin magnetic moment change for a small external magnetic field. Accordingly, a magnetic sheet for high frequency having high frequency characteristics suitable for an electronic device used in a high frequency band of 2 GHz or more can be provided.

In addition, according to the solution of the problem of the present invention, while the magnetic sheet for high frequency has a certain arrangement therein, a plurality of permanent magnets having a polarity in at least one specific direction is provided, the magnetic body having a spin direction magnetic moment By being formed into a sheet, the magnetic sheet for high frequency can be flexible, adjust the overall magnetic field direction, obtain a target permeability, have a high resonance frequency, and have a large spin magnetic field for a small external magnetic field. Moment change can be induced. Accordingly, a method of manufacturing a magnetic sheet for high frequency having high frequency characteristics suitable for an electronic device used in a high frequency band of 2 GHz or more can be provided.

1 is a three-dimensional view illustrating a magnetic sheet for high frequency and a method of manufacturing the same according to an embodiment of the present invention.
2 is a three-dimensional view for explaining a magnetic sheet for high frequency according to another embodiment of the present invention.
3 is a three-dimensional view for explaining a magnetic sheet for high frequency according to another embodiment of the present invention.
Figure 4 is a three-dimensional view for explaining a magnetic sheet for high frequency according to another embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in different forms. Rather, the embodiments introduced herein are provided so that the disclosure may be made thorough and complete, and to fully convey the spirit of the invention to those skilled in the art, and the invention is defined only by the scope of the claims.

Like reference numerals refer to like elements throughout the specification. Accordingly, the same or similar reference numerals may be described with reference to other drawings, even if not mentioned or described in the corresponding drawings. Also, although reference numerals are not indicated, they may be described with reference to other drawings.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, the words "comprises" and / or "comprising" refer to the presence of one or more other components, steps, operations and / or elements. Or does not exclude additions. In addition, since it is in accordance with the preferred embodiment, reference numerals presented in the order of description are not necessarily limited to the order. In addition, in the present specification, when it is mentioned that a film is on another film or substrate, it means that it may be formed directly on the other film or substrate or a third film may be interposed therebetween.

When an element is referred to as being 'connected to' or 'coupled to' with another element, when one element is directly connected or combined with another element, or in between Includes all cases that intervene. On the other hand, when one component is referred to as 'directly connected to' or 'directly coupled to' with another component, it means that the other component is not intervened. 'And / or' includes each and all combinations of one or more of the items mentioned.

The spatially relative terms 'below', 'beneath', 'lower', 'above', 'upper' and the like are shown in FIG. It may be used to easily describe the correlation of a device or components with other devices or components. Spatially relative terms are to be understood as terms that include different directions of the device in use or operation in addition to the directions shown in the figures. For example, when the device shown in the figure is reversed, a device described as 'below' or 'beneath' of another device may be placed 'above' of another device. Thus, the exemplary term 'below' may include both directions below and above. The device can also be oriented in other directions, so that spatially relative terms can be interpreted according to orientation.

In addition, the embodiments described herein will be described with reference to cross-sectional and / or plan views, which are ideal exemplary views of the present invention. In the drawings, the thicknesses of films and regions are exaggerated for effective explanation of technical content. Accordingly, shapes of the exemplary views may be modified by manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention are not limited to the specific forms shown, but also include variations in forms generated by the manufacturing process. For example, the etched region shown at right angles may be rounded or have a predetermined curvature. Accordingly, the regions illustrated in the figures have schematic attributes, and the shape of the regions illustrated in the figures is intended to illustrate a particular form of region of the device and not to limit the scope of the invention.

1 is a three-dimensional view illustrating a magnetic sheet for high frequency and a method of manufacturing the same according to an embodiment of the present invention.

Referring to FIG. 1, the high-frequency magnetic sheet 100 includes a magnetic sheet 110 having a plane spin magnetic moment (bidirectional dotted block arrow) and permanent magnets provided in the magnetic sheet 110. 120). That is, the high frequency magnetic sheet 100 may be manufactured by forming a magnetic sheet 110 having a plurality of permanent magnets 120 therein and having a spin direction magnetic moment.

The magnetic sheet 110 may include hexagonal iron oxide (hexa-ferrite). Since the magnetic sheet 110 includes hexagonal iron oxide having high magnetic anisotropy, the magnetic sheet 100 for high frequency according to the embodiment of the present invention may have a high resonance frequency. In addition, since the magnetic sheet 110 may be formed of a material having flexibility, the magnetic sheet 100 for high frequency according to the embodiment of the present invention may have flexibility.

The permanent magnets 120 may be provided to have a constant arrangement. FIG. 1 illustrates that the permanent magnets 120 are arranged in a matrix form in the magnetic sheet 110, but is not limited thereto. According to the object of the present invention, the permanent magnets 120 may be arranged in the magnetic sheet 110 in various forms. In addition, the shape of each of the permanent magnets 120 may vary. That is, the size or length of each of the permanent magnets 120 may vary. Although the permanent magnets 120 are illustrated in FIG. 1 in a cylindrical shape, the present invention is not limited thereto. According to the purpose of the present invention, the permanent magnets 120 may have various forms.

The permanent magnets 120 may have a polarity (dashed arrow) in at least one particular direction. Here, the polarity means one of the direction from the N pole to the S pole of the magnet and the direction from the S pole to the N pole. Accordingly, the permanent magnets 120 may be polarized in four specific directions with respect to the surface direction of the magnetic sheet 110. As shown, since the magnetic sheet 110 is a three-dimensional structure, the permanent magnets 120 may have polarity in six specific directions substantially relative to the plane direction in the three-dimensional structure of the magnetic sheet 110. However, in this case, the plane direction of the magnetic sheet 110 refers to a direction in which the magnetic sheet 110 extends to the xy plane while being placed on the xy plane of the three-dimensional coordinate system. Accordingly, the permanent magnets 120 may have polarity in two specific directions and two parallel directions perpendicular to the surface direction of the magnetic sheet 110. In addition, the z-axis perpendicular to the x-y plane of the three-dimensional coordinate system may be referred to as the axial direction of the magnetic sheet 110.

The permanent magnets 120 may have polarity in the same one particular direction. The same one specific direction may be a direction perpendicular to or parallel to the surface direction of the magnetic sheet 110. The case where the permanent magnets 120 have the same one specific direction of polarity is described in more detail in FIG. 2 or FIG. 4.

The permanent magnets 120 may have polarities in two specific directions opposite to each other. Polarities, which are two specific directions opposite to each other, may be a direction perpendicular to or parallel to the plane direction of the magnetic sheet 110. The case where the permanent magnets 120 have polarities in two specific directions opposite to each other is described in more detail in FIG. 3 or FIG. 4.

The high-frequency magnetic sheet 100 according to the embodiment of the present invention is provided with permanent magnets 120 inside the magnetic sheet 110 including hexagonal iron oxide, whereby the high-frequency magnetic sheet 100 provides flexibility. Can have In addition, the high-frequency magnetic sheet 100 is provided so that the permanent magnets 120 have a certain arrangement inside the magnetic sheet 110 and have polarities in specific directions, so that the entire magnetic field of the high-frequency magnetic sheet 100 is provided. The direction can be adjusted. In addition, the high frequency magnetic sheet 100 is provided such that the permanent magnets 120 have polarities in specific directions inside the magnetic sheet 110, thereby controlling magnetic anisotropy of the high frequency magnetic sheet 100. The investment rate can be secured. In addition, the high-frequency magnetic sheet 100 is provided so that the permanent magnets 120 have a polarity in the plane direction of the magnetic sheet 110 inside the magnetic sheet 110, so that the entire resonance of the high-frequency magnetic sheet 100 is performed. The frequency can be high. In addition, the high-frequency magnetic sheet 100 is provided such that the permanent magnets 120 have a polarity in the same one specific direction inside the magnetic sheet 110, so that the high-frequency magnetic sheet 100 is applied to a small external magnetic field. Large spin magnetic moment change can be induced.

2 to 4, magnetic sheets for high frequency according to other embodiments of the present invention are described. 2 to 4 are three-dimensional views of the magnetic sheets for high frequency in accordance with each of the other embodiments of the present invention. Components described through the embodiments of the present invention described above use the same reference numerals and description thereof will be omitted.

Referring to FIG. 2, the high-frequency magnetic sheet 100a includes a magnetic sheet 110 having a planar spin magnetic moment (bidirectional dotted block arrow) and permanent magnets 120 and 130 provided in the magnetic sheet 110. It may include.

The permanent magnets 120 and 130 may have polarities in two specific directions opposite to each other. Two specific directions opposite to each other may be directions perpendicular to the plane direction of the magnetic sheet 110. That is, the permanent magnets 120 and 130 may include the first permanent magnets 120 having a polarity perpendicular to the surface direction of the magnetic sheet 110 and the second permanent magnets 130 having the polarity perpendicular to the downward direction. It can be composed of). Accordingly, the axial magnetic anisotropy of the high frequency magnetic sheet 100a may be weakly adjusted.

Referring to FIG. 3, the high frequency magnetic sheet 100b may include a magnetic sheet 110 having a plane spin magnetic moment (bidirectional dotted block arrow) and permanent magnets 120 provided in the magnetic sheet 110. Can be.

The permanent magnets 120 may have polarity in the same one particular direction. The same specific direction may be directions perpendicular to the surface direction of the magnetic sheet 110. That is, the permanent magnets 120 may have only the same polarity perpendicular to the plane direction of the magnetic sheet 110. Alternatively, although not shown, the permanent magnets (see 130 of FIG. 2) may have only the same polarity perpendicular to the plane direction of the magnetic sheet 110. Accordingly, the axial magnetic anisotropy of the high frequency magnetic sheet 100b can be strongly controlled.

Referring to FIG. 4, the high frequency magnetic sheet 100c may include a magnetic sheet 110 having a plane spin magnetic moment (dashed block arrow) and permanent magnets 140 provided in the magnetic sheet 110. have.

The permanent magnets 140 may have polarity in the same one particular direction. The same specific direction may be directions parallel to the plane direction of the magnetic sheet 110. That is, the permanent magnets 140 may have only the same polarity as one of both directions of the planar spin magnetic moment of the magnetic sheet 110. Accordingly, one-way magnetic anisotropy of the high frequency magnetic sheet 100c may be strongly controlled.

On the contrary, although not shown, the permanent magnets may have only the same polarity as the other direction opposite to one of both directions of the planar spin magnetic moment of the magnetic sheet 110. Accordingly, the magnetic anisotropy in the other direction of the high frequency magnetic sheet 100c may be strongly controlled.

In addition, although not shown, the permanent magnets may have polarities in two specific directions opposite to each other. Two specific directions opposite to each other may be directions parallel to both directions of the planar spin magnetic moment of the magnetic sheet 110. That is, the permanent magnets are third permanent magnets 140 having polarities parallel to one of the two directions of the planar spin magnetic moment of the magnetic sheet 110 and fourth permanent magnets having polarities parallel to the other directions. It can be configured as. Accordingly, the surface direction magnetic anisotropy of the high frequency magnetic sheet 100c may be weakly adjusted.

The high-frequency magnetic sheet according to the embodiments of the present invention has a constant arrangement in the magnetic sheet and has permanent magnets having polarity in at least one specific direction, whereby the high-frequency magnetic sheet may have flexibility, and the entire magnetic field Direction can be adjusted, target permeability can be secured, high resonant frequency can be obtained, and large spin magnetic moment change can be induced for small external magnetic field. Accordingly, a magnetic sheet for high frequency having high frequency characteristics suitable for an electronic device used in a high frequency band of 2 GHz or more can be provided.

In addition, the high-frequency magnetic sheet manufactured according to the embodiments of the present invention has a predetermined arrangement therein, and is provided with a plurality of permanent magnets having a polarity in at least one specific direction, and having a spin direction magnetic moment in a plane direction. By forming a magnetic sheet, the high-frequency magnetic sheet can be flexible, adjust the overall magnetic field direction, secure a target permeability, have a high resonance frequency, and have a large spin for a small external magnetic field. It can induce magnetic moment change. Accordingly, a method of manufacturing a magnetic sheet for high frequency having high frequency characteristics suitable for an electronic device used in a high frequency band of 2 GHz or more can be provided.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. You will understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

100, 100a, 100b, 100c: Magnetic Sheet for High Frequency
110: magnetic sheet
120, 130, 140: permanent magnet

Claims (20)

A magnetic sheet having a lateral spin magnetic moment; And
Is provided in a plurality of the magnetic sheet, including permanent magnets having a polarity in at least one specific direction,
The permanent magnets have the same polarity in one particular direction,
The same one specific direction is a direction perpendicular to or parallel to the surface direction of the magnetic sheet,
The magnetic sheet for high frequency magnetic axial anisotropy is adjusted if the permanent magnets have a polarity that is a direction perpendicular to the plane direction of the magnetic sheet. The method of claim 1,
The magnetic sheet is a high-frequency magnetic sheet containing a hexagonal iron oxide. delete delete delete delete A magnetic sheet having a lateral spin magnetic moment; And
Is provided in a plurality of the magnetic sheet, including permanent magnets having a polarity in at least one specific direction,
The permanent magnets have the same polarity in one particular direction,
The same one specific direction is a direction perpendicular to or parallel to the surface direction of the magnetic sheet,
The magnetic sheet for high-frequency magnetic sheet is controlled when the permanent magnets have a polarity that is a direction parallel to the surface direction of the magnetic sheet. A magnetic sheet having a lateral spin magnetic moment; And
Is provided in a plurality of the magnetic sheet, including permanent magnets having a polarity in at least one specific direction,
The permanent magnets have polarities in two specific directions opposite to each other,
Polarities in two specific directions opposite to each other are directions perpendicular to or parallel to the plane direction of the magnetic sheet,
And axial magnetic anisotropy when the permanent magnets have polarities that are directions perpendicular to the plane direction of the magnetic sheet. delete delete A magnetic sheet having a lateral spin magnetic moment; And
Is provided in a plurality of the magnetic sheet, including permanent magnets having a polarity in at least one specific direction,
The permanent magnets have polarities in two specific directions opposite to each other,
Polarities in two specific directions opposite to each other are directions perpendicular to or parallel to the plane direction of the magnetic sheet,
And magnetic direction anisotropy of surface direction is controlled when the permanent magnets have polarities in directions parallel to the surface direction of the magnetic sheet. The method of claim 1,
Magnetic sheet for high frequency magnetic permeability or resonant frequency is adjusted according to the size or length of the permanent magnets. delete delete delete delete delete delete delete delete
KR1020140124836A 2014-09-19 2014-09-19 Magnetic Sheet for High Frequency Application and Method of Fabricating the Same KR102018305B1 (en)

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KR102018305B1 true KR102018305B1 (en) 2019-09-04

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001053486A (en) * 1999-08-16 2001-02-23 Sony Corp Electromagnetic wave absorption method
JP2003055038A (en) * 2001-08-22 2003-02-26 Kitagawa Ind Co Ltd Method for producing soft magnetic hexagonal ferritic sintered compact and soft magnetic hexagonal ferritic sintered compact
JP2013253122A (en) * 2011-04-25 2013-12-19 Sumitomo Osaka Cement Co Ltd Composite magnetic material, method for manufacturing the same, antenna, and communication device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2885594B2 (en) * 1993-01-11 1999-04-26 日本電気株式会社 Radio wave absorber

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001053486A (en) * 1999-08-16 2001-02-23 Sony Corp Electromagnetic wave absorption method
JP2003055038A (en) * 2001-08-22 2003-02-26 Kitagawa Ind Co Ltd Method for producing soft magnetic hexagonal ferritic sintered compact and soft magnetic hexagonal ferritic sintered compact
JP2013253122A (en) * 2011-04-25 2013-12-19 Sumitomo Osaka Cement Co Ltd Composite magnetic material, method for manufacturing the same, antenna, and communication device

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