JP5088813B2 - COMPOSITE MAGNETIC MATERIAL, ITS MANUFACTURING METHOD, CIRCUIT BOARD USING THE SAME, AND ELECTRONIC DEVICE USING THE SAME - Google Patents

Description

  The present invention relates to a high-frequency circuit board and a high-frequency electronic component, and more particularly to a composite magnetic body suitable as a material for the high-frequency circuit board and the high-frequency electronic component and a method for manufacturing the same.

With the increase in speed and density of information communication devices, there is a strong demand for downsizing and low power consumption of electronic components and circuit boards mounted on electronic devices. In general, the wavelength λg of the electromagnetic wave propagating in the material is obtained by using the wavelength λ0 of the electromagnetic wave propagating in the vacuum, the relative permittivity εr and the relative permeability μr of the material,
λg = λ0 / (εr · μr) ^1/2
Therefore, it is known that the larger the relative dielectric constant εr and the relative magnetic permeability μr, the larger the wavelength shortening rate and the smaller electronic components and circuit boards.

Moreover, the characteristic impedance Zg of the material uses the vacuum characteristic impedance Z0,
Zg = Z0 · (μr / εr) ^1/2
For example, an attempt to reduce the power consumption of an electronic component or a circuit board by increasing the relative permeability μr to increase the characteristic impedance Zg and the resistance value of the termination resistor and reducing the current flowing through the wiring. Has been reported.

However, eddy currents are generated on the surface of magnetic materials in the high-frequency band used by information and communication equipment, and this eddy current generates a magnetic field in a direction that cancels the change in the applied magnetic field, resulting in a decrease in the apparent permeability of the material. Was invited. Moreover, since an increase in eddy current causes energy loss due to Joule heat, it has been difficult to use it as a material for circuit boards and electronic components. To reduce eddy currents,
d = 1 / (π · f · μ0 · μr · σ) ^1/2
It is effective to make the diameter of the magnetic powder smaller than the skin depth d expressed by Here, f is the signal frequency, σ is the conductivity of the magnetic powder, and μ 0 is the permeability of the vacuum. In recent years, with the advancement of nanotechnology, the miniaturization of magnetic particles has progressed, and some cases have been reported in which the decrease in the relative permeability μr of materials at high frequencies is suppressed.

  Patent Document 1 discloses that a flat magnetic powder is dispersed in a resin to increase the relative magnetic permeability and loss and use it as an electromagnetic wave absorbing sheet.

Further, Patent Document 2 provides a composite magnetic body having a small loss at about 300 MHz or less by dispersing magnetic particles having a plurality of particle diameters in a resin using a dispersion mixing method using screw stirring and ultrasonic stirring. ing.

Japanese Patent Laid-Open No. 11-354773 JP 2006-269134 A

  However, in Patent Document 1, there is no specific description about the method of dispersing the magnetic particles, and since the purpose is to shield and absorb electromagnetic waves, a material having a large magnetic loss at the operating frequency is provided. However, it does not provide a material with a small magnetic loss for the purpose of use for a circuit board, an electronic component or the like.

  Further, as shown in Patent Document 2, when a spherical magnetic powder is used, the demagnetizing coefficient of each magnetic particle increases, leading to a decrease in the relative permeability μr. In this case, in order to increase the relative permeability μr, it is necessary to increase the mixing concentration, and when the mixing concentration is increased, there is a tendency for manufacturing difficulties such as difficulty in obtaining uniform dispersibility.

  Moreover, since the magnetic interaction is added to the magnetic double particles in addition to the interaction of the electric double layer and the attractive energy of van der Waals, the fine magnetic fine particles easily cause aggregation and form an aggregate. Aggregates in the composite magnetic body behave as one large magnetic particle, and thus easily generate eddy currents at high frequencies, causing a decrease in magnetic properties. It has been found that the mixing method disclosed in Patent Document 2 is insufficient for crushing these aggregates and does not lead to loss reduction at several hundred MHz to 1 GHz.

The present invention has been made in view of the above problems, in the composite magnetic body composed by dispersing a magnetic powder in an insulating material, the shape of the magnetic powder is a Bian flat shape, the frequency of 1GHz It is an object of the present invention to provide a composite magnetic body having a relative permeability μr of greater than 1 and a loss tangent tan δ of 0.1 or less, a manufacturing method thereof, and an electronic device using the same. Is.

  As a result of intensive studies, the present inventors have found that loss can be reduced even in a frequency band of 500 MHz to 1 GHz by suitably performing dispersion of magnetic powder.

According to a first aspect of the present invention, the composite magnetic comprising a step of preparing a slurry by mixing an insulating material with magnetic powder is dispersed in a solvent, applying the slurry, drying, and firing a method of manufacturing a body, a process of manufacturing the slurry includes a step of producing a dispersion solvent containing a surfactant in a solvent, and a step of mixing the magnetic powder in the dispersion solvent, the magnetic powder Mixing the dispersion medium having a hardness larger than that of the magnetic powder and a particle diameter of 0.1 mm to 3.0 mm to the dispersion solvent, and mixing the spherical magnetic powder and the dispersion medium. by performing the rotation revolution type mixing at the revolving speed 500rpm or more and rotational speed 200rpm or more to the dispersion solvent, thereby crushing the aggregates of the magnetic powder, spherical of the magnetic powder the dispersion medium Method for producing a composite magnetic body characterized by comprising the step of deforming mechanically flat by N shear stress is obtained.

According to the second aspect of the present invention, the manufacturing process of the slurry further includes a step of adding and mixing an insulating material to the slurry, the solvent, the surfactant, the magnetic powder, the dispersion medium, and the Separating the dispersion medium from a mixture of insulating materials. The method for producing a composite magnetic body according to the first aspect is obtained.

According to the third aspect of the present invention, in the step of separating the dispersion medium, the mixture is allowed to stand or is centrifuged to separate the mixture from the part containing the dispersion medium. The method for producing a composite magnetic body according to the second aspect is characterized in that the method includes the step of separating into two .

According to the fourth aspect of the present invention, the magnetic powder is any one of nickel (Ni), permalloy (Fe—Ni alloy), copper (Cu), cobalt (Co), zinc (Zn), and molybdenum (Mo). The method for producing a composite magnetic body according to any one of the first to third aspects, wherein the composite magnetic body is selected from permalloy containing at least one kind.

According to the fifth aspect of the present invention, the insulating material includes polyimide resin, polybenzoxazole resin, polyphenylene resin, polybenzocyclobutene resin, polyarylene ether resin, polysiloxane resin, epoxy resin, polyester resin, fluorine Synthetic resin or liquid phase resin including at least one of resin, polyolefin resin, polycycloolefin resin, cyanate resin, polyphenylene ether resin, and polystyrene resin, or Al2O3, SiO2, TiO2, 2MgO · SiO2, MgTiO3, CaTiO3, The method for producing a composite magnetic body according to the first to fourth aspects is obtained, which is a raw material for at least one ceramic selected from the group consisting of SrTiO3 and BaTiO3 ceramics.

According to a sixth aspect of the present invention, the dispersion medium to be added in the mixing step of powder the magnetic properties powder, metal, metal oxide, the oxide sintered body, nitride sintered body, silicide sintered, And the method of producing a composite magnetic body according to any one of the first to fifth aspects, wherein the composite magnetic body is at least one particle selected from the group consisting of glass and glass.

According to a seventh aspect of the present invention, the dispersion medium comprises aluminum, steel, lead, iron oxide, amilna, zirconia, silicon dioxide, titania, silicon nitride, silicon carbide, soda glass, lead glass, and high specific gravity. The method for producing a composite magnetic body according to the sixth aspect, comprising at least one glass, is obtained.

According to an eighth aspect of the present invention, there is provided the method for producing a composite magnetic body according to the sixth or seventh aspect, wherein the dispersion medium has a specific gravity of 6 or more.

According to a ninth aspect of the present invention, there is obtained the method for producing a composite magnetic body according to the eighth aspect, wherein the dispersion medium contains any one of zirconia, steel, and stainless steel.

According to the tenth aspect of the present invention, there is obtained a composite magnetic body produced by the manufacturing method according to any one of the first to ninth aspects.

According to an eleventh aspect of the present invention, the circuit board characterized in that it comprises at least a double engagement magnetic mounting serial to a tenth aspect can be obtained.

According to a twelfth aspect of the present invention, an electronic component comprising at least the composite magnetic body according to the tenth aspect is obtained.

According to a thirteenth aspect of the present invention, there is obtained an electronic apparatus characterized by having at least the circuit board according to the eleventh aspect .

According to a fourteenth aspect of the present invention, there is obtained an electronic apparatus characterized by having at least the electronic component according to the twelfth aspect.

  According to the present invention, spherical magnetic powder or flat magnetic powder is suitably mixed and dispersed in an insulating material, so that the relative permeability μr is greater than 1 and the loss tangent tan δ is 0.1 at a frequency of 1 GHz. It is possible to provide a composite magnetic body characterized by being 1 or less. By applying the composite magnetic body according to the present invention as a material for a circuit board and / or an electronic component, an information communication device in a band of several hundred MHz to 1 MHz, which has been difficult to realize with a circuit board or electronic component using only a dielectric. It becomes possible to realize downsizing and low power consumption.

  First, the magnetic powder constituting the composite magnetic body according to the embodiment of the present invention will be described.

  The magnetic powder is made of permalloy containing at least one of nickel (Ni), permalloy (Fe—Ni alloy) or copper (Cu), cobalt (Co), zinc (Zn), and molybdenum (Mo). Although it is preferable, other alloys, for example, Fe-Si-Al alloy, Fe-Si alloy, Fe-Co alloy, Fe-Cr alloy, Fe-Cr-Si alloy, etc. may be used.

  As the magnetic powder of the above-described material, a spherical or flat shape can be used, but the case where the flat magnetic powder is used will be described below. The flat magnetic powder is obtained by mechanically deforming a spherical magnetic powder into a flat shape by the shear stress of the dispersion medium in the step of mixing the magnetic powder in the dispersion solvent, and has a thickness of 0.1 to 1 μm. It is preferable to have it. Setting the thickness of the flat magnetic powder to less than 0.1 μm is difficult in manufacturing and handling. Further, if the thickness of the flat magnetic powder exceeds 1 μm, it is not preferable because an eddy current is generated and magnetic characteristics at high frequencies are lowered. Further, if the aspect ratio (length / thickness) of the flat magnetic powder is smaller than 2, the demagnetizing factor of the powder is increased, and the relative magnetic permeability μr of the composite magnetic material is decreased, which is not preferable.

  Next, the insulating material constituting the composite magnetic body will be described.

  When the composite magnetic material is used as a material for a circuit board, it is preferable that the dielectric constant is low from the viewpoint of increasing the characteristic impedance. As the insulating material, polyimide resin, polybenzoxazole resin, polyphenylene resin, polybenzocyclobutene Low dielectric constant synthetic resins such as resins, polyarylene ether resins, polysiloxane resins, epoxy resins, polyester resins, fluororesins, polyolefin resins, polycycloolefin resins, cyanate resins, polyphenylene ether resins, polystyrene resins are suitably selected. The

When a high dielectric constant such as a capacitor or antenna element is required, ceramics such as Al ₂ O ₃ , SiO ₂ , TiO ₂ , 2MgO · SiO ₂ , MgTiO ₃ , CaTiO ₃ , SrTiO ₃ , BaTiO ₃ , or these inorganic substances A mixture of organic substances and the like can be used as appropriate.

  Hereinafter, a specific method for producing the composite magnetic body according to the present embodiment will be described.

  First, for comparison evaluation, the method described in Patent Document 2 disclosed by the present inventors as a conventional method was verified. Nitrogen-containing graft polymer as a surfactant is dissolved in 1 g of 78-permalloy magnetic powder (Ni: 78% -Fe: 22% alloy) having an average particle size of 0.15 μm and 10 g of a mixture of xylene and cyclopentanone 4: 1. The dispersion was mixed by rotation and revolution stirring and ultrasonic irradiation stirring to prepare a slurry liquid. Concentrating the paste obtained by mixing the slurry liquid and 0.5 g of a resin varnish obtained by diluting the polycycloolefin resin to a solid content ratio of 40% by rotation revolution stirring and ultrasonic irradiation stirring, The composite magnetic body is formed by performing coating, drying, heat treatment and press molding. When the complex magnetic permeability of the composite magnetic material was measured by the parallel line method, the relative magnetic permeability μr = 4 and the magnetic loss tan δ = 0.3 at a frequency of 1 GHz, and the magnetic characteristics were up to a frequency of about 2 to 300 MHz. Although it showed a good value, it was found that the magnetic loss increased at a frequency of 300 MHz or higher (see FIG. 5). Further, when the dispersibility of the magnetic powder in the composite magnetic sheet was confirmed with a scanning electron microscope, it was found that spherical particles aggregated to form aggregates of slightly over 1 μm (see FIG. 6). ).

  Therefore, as a result of intensive studies in view of the above, the present inventors have conducted mixing using the following manufacturing method, and thereby the relative permeability μr is larger than 1 at a frequency of 1 GHz or less and the loss is reduced. It has been found that a composite magnetic body having a tangent tan δ of 0.1 or less can be obtained.

  The greatest feature of the production process according to the present invention is that when mixing and stirring using the same amount of raw materials as described above, a dispersion medium is introduced into a mixing vessel at a high speed (revolution speed of 500 rpm or more, rotation speed of 200 rpm or more). Since the rotation and revolution stirring is performed, the magnetic particles are flattened by the strong shear stress generated by the dispersion medium, and at the same time, the aggregated particles are crushed and the dispersibility is improved.

  More specifically, the production method according to the present invention comprises a step of producing a dispersion solvent in which a surfactant is added to a solvent during a step of producing a slurry by dispersing and mixing magnetic powder in a solvent, A mixing step of mixing the magnetic powder in the solvent, and when the magnetic powder is mixed in the dispersion solvent, the dispersion medium is added, and with the dispersion medium added, rotation and revolution mixing is performed, and the magnetic powder is mixed. It is characterized by flattening the powder. Then, an insulating material is added and mixed with this.

  As described above, when a slurry composed of a mixture of the solvent, the surfactant, the magnetic powder, the dispersion medium, and the insulating material is generated and the rotation and revolution mixing is completed, the step of separating the dispersion medium from the mixture is performed. Done. Note that the step of separating the dispersion medium may be performed before the addition and mixing of the insulating material. The step of separating the dispersion medium may be a step of allowing the mixture to stand until the dispersion medium is separated from another solvent or the like, or separating the dispersion medium from the mixture by centrifuging the mixture. It may be a process to perform.

  Examples of the apparatus that can be used in the above mixing process of mixing the solvent, surfactant, magnetic powder, dispersion medium, and insulating material include a kneader, a roll mill, a pin mill, a sand mill, a ball mill, and a planetary ball mill. In order to use the dispersion medium according to the present invention, a sand mill, a ball mill, a planetary ball mill or the like is suitable.

  Dispersion media include metals such as aluminum, steel and lead or metal oxides, oxide sintered bodies such as amilna, zirconia, silicon dioxide and titania, nitride sintered bodies such as silicon nitride, and silicon carbide. Examples of the dispersion medium according to the present invention include zirconia having a specific gravity of 6 or more, steel, stainless steel, etc., in terms of mixing efficiency, such as silicide sintering such as soda glass, lead glass, and high specific gravity glass. To preferred. This dispersion medium is characterized by having a hardness higher than that of the magnetic powder.

  Further, since the mixing is performed by the impact of the collision of the dispersion medium, the dispersibility improves as the number of collisions increases. Therefore, the smaller the average particle size of the dispersion medium, the greater the number of particles filled per unit volume, the greater the number of collisions and the better the dispersibility. On the other hand, if the particle size is too small, it is difficult to separate from the slurry. Become. Therefore, it is necessary to have an average particle size of at least 0.1 mm. In addition, if the particle size of the dispersion medium becomes too large, the number of collisions described above decreases and the dispersion performance deteriorates, so the upper limit of the average particle size is 3.0 mm.

  If the mixing and stirring time is too short, the spherical magnetic particles are not sufficiently flattened, and if too long, the flattened magnetic particles are further ground and cannot maintain an appropriate aspect ratio (length / thickness). For this reason, the magnetic characteristics at high frequencies deteriorate. Accordingly, the mixing and stirring time is preferably about 30 minutes, but this needs to be adjusted appropriately depending on the initial amount of raw materials and the rotation and revolution speed of stirring.

  Next, a method for applying the obtained slurry will be described. As a coating method, a dry film can be produced by forming this into an arbitrary sheet shape by a known forming method such as a press method, a doctor blade method, or an injection molding method. Among these methods, it is desirable to form a laminated body of composite magnetic bodies into a sheet by a doctor blade method. The slurry is applied after volatilization of the solvent and concentration to adjust the viscosity suitable for the above application method. If necessary, after the slurry application, an orientation treatment for orienting the flat magnetic powder in a direction parallel to the sheet is performed by orientation of the magnetic field before drying.

  Finally, the dry film thus obtained is heat-treated and press-molded in a reducing atmosphere or vacuum to obtain a composite magnetic body.

  In the manufacturing method of the present invention as described above, local aggregation of magnetic particles in the composite magnetic material can be alleviated, so that improvement in relative permeability μr at high frequency and reduction in magnetic loss tan δ are simultaneously achieved. It becomes possible.

  Next, examples according to the present invention will be described.

  EXAMPLES Hereinafter, the present invention will be specifically described with reference to Examples 1 to 4, but the present invention is not limited to these Examples.

1 g of 78-permalloy magnetic powder (Ni: 78% -Fe: 22% alloy) having an average particle size of 0.15 μm is dissolved in 10 g of xylene and cyclopentanone 4: 1 mixed solution with nitrogen-containing graft polymer as a surfactant. In addition, zirconia beads having an average particle diameter of 200 μm were added as a dispersion medium, and planetary stirring was performed for 30 minutes in this state to flatten the magnetic powder. 0.5 g of a resin varnish obtained by diluting the polycycloolefin resin to a solid content ratio of 40% was added to the slurry thus obtained, and further mixed for 5 minutes by planetary stirring . Both the revolution speed of the Yu star during stirring 2000rpm, rotation speed was 800rpm.

Next, the obtained mixed liquid is allowed to stand to settle the dispersion medium (the specific gravity of the magnetic powder is 7 to 8 and the specific gravity of zirconia is 6 to 7, but the particle diameter of the zirconia beads is magnetic with respect to 200 μm. Since the particle size of the powder is 0.15 μm, the zirconia beads are heavier, so the zirconia beads settle), and the supernatant is introduced into a rotary evaporator under a reduced pressure of 50 ° C. and 2.7 kPa (the boiling point of the solvent due to the reduced pressure). The solvent was evaporated and the viscosity allowed to be applied with a doctor blade. The mixture obtained as described above was formed into a film by the doctor blade method, and then dried at room temperature while orienting the magnetic particles by applying a magnetic field of 1.6 × 10 ⁵ A / m. The dry film thus obtained was press fired with a reduced-pressure press. The press conditions were raised to 130 ° C. over 20 minutes at normal pressure, then held at pressure of 2 MPa and held for 5 minutes, then heated to 160 ° C. and held for 40 minutes to cure the resin, and the area was 30 mm square. A composite magnetic body having a thickness of about 60 μm was obtained. When the complex permeability of this composite magnetic material was measured by the parallel line method, the relative permeability μr = 6 and the magnetic loss tan δ = 0.08 at 1 GHz (see FIG. 1). A photomicrograph showing the structure of this composite magnetic material is shown in FIG. It can be seen that the magnetic particles are flattened and oriented in the direction of the applied magnetic field.

  Using 1 g of 45-permalloy magnetic powder (Ni: 45% -Fe: 55% alloy) having an average particle size of 0.15 μm, a composite magnetic body was produced under the same conditions as in Example 1 above, and the area was 30 mm square and the thickness was A composite magnetic body of 60 μm was obtained. When the complex magnetic permeability of this composite magnetic material was measured by the parallel line method, the relative magnetic permeability μr = 5 and the magnetic loss tan δ = 0.05 at 1 GHz (see FIG. 3). A photomicrograph showing the structure of this composite magnetic material is shown in FIG.

  An embodiment in which the composite magnetic material is applied to a circuit board will be described. First, six composite magnetic dry films having a thickness of about 60 μm obtained in the process shown in Example 1 were laminated and press-fired to produce a composite magnetic material having a thickness of about 350 μm. Further, the composite magnetic material is sandwiched between low dielectric constant resin films and heated to cure the resin, and then copper plating is applied to the resin surface to form a wiring pattern (microstrip line) having a length of 30 mm and a width of 0.9 mm. Formed. FIG. 7 shows an external view of the circuit board. FIG. 8 shows the transmission characteristics and reflection characteristics of the circuit board, but the actual measurement results and the values calculated by the electromagnetic field simulator HFSS are in good agreement, and desired relative permeability and loss can be obtained at high frequencies. I understand that

  As an example of applying this composite magnetic body to an electronic component, an example of an antenna for a mobile device using the composite magnetic body is shown. As shown in FIG. 9, the antenna element has a structure in which a conductor wire having a length of 44 mm and a width of 1.5 mm is sandwiched between two composite magnetic materials having a length of 42 mm, a width of 5 mm, and a thickness of 0.35 mm. The element was connected to a conductor plate having a length of 80 mm, a width of 35 mm, and a thickness of 1 mm, and 50Ω was fed at the connection point. FIG. 10 shows the input reflection characteristics of the antenna. The actual measurement result and the calculated value by the electromagnetic field simulator HFSS are in good agreement, and it can be seen that desired relative permeability and loss are obtained at high frequency.

  The present invention is applied to a semiconductor device, a circuit element, a flat panel display, and other high frequency electronic components, and is also applied to a high frequency circuit board on which these are mounted, thereby enabling miniaturization and low power consumption. Accordingly, it is possible to reduce the size and power consumption of all the high-frequency electronic devices on which the electronic components and / or circuit boards to which the present invention is applied are mounted.

It is a figure which shows the value of the magnetic characteristic of the composite magnetic body obtained in Example 1 of this invention with respect to a frequency. It is a scanning electron micrograph of the composite magnetic body obtained in Example 1 of the present invention. It is a figure which shows the value of the magnetic characteristic of the composite magnetic body obtained in Example 2 of this invention with respect to a frequency. It is a scanning electron micrograph of the composite magnetic body obtained in Example 2 of the present invention. It is a figure which shows the value of the magnetic characteristic of the composite magnetic body obtained by the conventional method with respect to a frequency. It is a scanning electron micrograph of the composite magnetic body obtained by the conventional method. It is the schematic which shows the structure of the high frequency circuit board which concerns on Example 3 of this invention. It is a figure which shows the value of the passage characteristic and reflection characteristic of the high frequency circuit board shown in FIG. 7 with respect to a frequency. It is the schematic which shows the structure of the antenna which concerns on Example 4 of this invention. It is a figure which shows the input reflection characteristic of the antenna shown by FIG. 9 with respect to a frequency.

Explanation of symbols

10 Composite Magnetic Substrate 12 Conductor Line 14 Feed Port 16 Composite Magnetic Antenna

Claims (14)

An insulating material and magnetic powder and process for producing the slurry was mixed and dispersed in a solvent, applying the slurry, drying, method of manufacturing the composite magnetic body and a step of firing,
The step of producing the slurry includes a step of producing a dispersion solvent obtained by adding a surfactant to a solvent, and a step of mixing the magnetic powder in the dispersion solvent.
The step of mixing the magnetic powder includes a step of further adding a dispersion medium having a hardness larger than the magnetic powder and a particle size of 0.1 mm to 3.0 mm to the dispersion solvent, and the spherical magnetic powder and the dispersion medium. by performing the rotation revolution type mixing at the revolving speed 500rpm or more and rotational speed 200rpm or more to the dispersion solvent obtained by mixing, with crushing the aggregates of the magnetic powder, spherical of the magnetic powder the dispersion medium And a step of mechanically deforming into a flat shape by a shear stress . The manufacturing process of the slurry further includes a step of adding and mixing an insulating material to the slurry, and a step of separating the dispersion medium from the slurry before or after the addition of the insulating material. 2. A method for producing a composite magnetic material according to 1 . The step of separating the dispersion medium includes a step of standing or centrifuging the mixture to separate the mixture into a portion containing the dispersion medium and a portion not containing the dispersion medium. The manufacturing method of the composite magnetic body of Claim 2 . The magnetic powder was selected from nickel (Ni), permalloy (Fe—Ni alloy), and permalloy containing at least one of copper (Cu), cobalt (Co), zinc (Zn), and molybdenum (Mo). The method for producing a composite magnetic body according to any one of claims 1 to 3 , wherein the method is a thing. The insulating material is polyimide resin, polybenzoxazole resin, polyphenylene resin, polybenzocyclobutene resin, polyarylene ether resin, polysiloxane resin, epoxy resin, polyester resin, fluorine resin, polyolefin resin, polycycloolefin resin, cyanate Synthetic resin or liquid phase resin including at least one of resin, polyphenylene ether resin, and polystyrene resin, or selected from the group consisting of ceramics of Al2O3, SiO2, TiO2, 2MgO.SiO2, MgTiO3, CaTiO3, SrTiO3, and BaTiO3. method for producing a composite magnetic body according to any one of claims 1 to 4, characterized in that it is a raw material of at least one ceramics are. Dispersion medium to be added in the mixing step of powder the magnetic properties powder, metal, metal oxide, the oxide sintered body, nitride sintered body, silicide sintered, and at least one selected from the group consisting of glass The method for producing a composite magnetic body according to any one of claims 1 to 5 , wherein the composite magnetic body is a granule. The dispersion medium includes at least one of aluminum, steel, lead, iron oxide, amyrna, zirconia, silicon dioxide, titania, silicon nitride, silicon carbide, soda glass, lead glass, and high specific gravity glass. The manufacturing method of the composite magnetic body of Claim 6 . The method for producing a composite magnetic body according to claim 6 or 7 , wherein the dispersion medium has a specific gravity of 6 or more. The method for producing a composite magnetic body according to claim 8 , wherein the dispersion medium includes any one of zirconia, steel, and stainless steel.   A composite magnetic body produced by the production method according to claim 1. A circuit board comprising at least the composite magnetic material according to claim 10 . An electronic component comprising at least the composite magnetic body according to claim 10 . An electronic apparatus comprising at least the circuit board according to claim 11 . An electronic apparatus comprising at least the electronic component according to claim 12 .