JP2002124408A - Ni-Cu-Zn-BASED MAGNETIC FERRITE MATERIAL - Google Patents
Ni-Cu-Zn-BASED MAGNETIC FERRITE MATERIALInfo
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- JP2002124408A JP2002124408A JP2000313072A JP2000313072A JP2002124408A JP 2002124408 A JP2002124408 A JP 2002124408A JP 2000313072 A JP2000313072 A JP 2000313072A JP 2000313072 A JP2000313072 A JP 2000313072A JP 2002124408 A JP2002124408 A JP 2002124408A
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- ferrite
- mol
- sno
- ferrite material
- fluctuation
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- 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
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
- H01F1/342—Oxides
- H01F1/344—Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Compounds Of Iron (AREA)
- Magnetic Ceramics (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、Ni−Cu−Zn系フェ
ライト磁性材料の組成に係るもので、積層チップ部品お
よび積層インダクタに適した磁性材料に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composition of a Ni-Cu-Zn ferrite magnetic material, and more particularly to a magnetic material suitable for a multilayer chip component and a multilayer inductor.
【０００２】[0002]
【従来の技術】コイル、トランスの磁性コアとして各種
のフェライト燒結体が用いられている。また、コイル、
トランスあるいは複合部品を磁性体の積層体内部に周回
する導体パターンを形成した積層インダクタで構成する
ことも実用化されている。高周波用の磁性材料としては
比抵抗の大きなNi−Zn系あるいはNi−Cu−Zn系フェライ
トが用いられる。2. Description of the Related Art Various ferrite sintered bodies are used as magnetic cores of coils and transformers. Also, coils,
It has also been put to practical use to configure a transformer or a composite component with a laminated inductor in which a conductor pattern circulating inside a magnetic laminate is formed. As the magnetic material for high frequency, Ni-Zn or Ni-Cu-Zn ferrite having a large specific resistance is used.
【０００３】積層インダクタに用いる磁性材料には、幾
つかの条件が求められる。第１は内部の銀電極と一体に
焼成するために、950°C以下の焼成温度が必要となる。
また、一般に低温焼成すると燒結密度が低くなり、機械
的強度が低下するが、ある程度の機械的強度を確保する
ことが要求される。また、透磁率等の電気的特性や温度
特性の安定なども要求される。Several conditions are required for a magnetic material used for a laminated inductor. First, a firing temperature of 950 ° C. or lower is required for firing integrally with the internal silver electrode.
In general, sintering at a low temperature lowers the sintering density and lowers the mechanical strength, but it is required to secure a certain level of mechanical strength. In addition, stability of electrical characteristics such as magnetic permeability and temperature characteristics is required.
【０００４】また、フェライト材の磁気特性は、フェラ
イト材に加えられる応力の影響を受け易いことが知られ
ており、応力が加わると透磁率に変動が生じ、インダク
タとしてのインダクタンスに変動を生じる。コアに巻線
を施した従来のインダクタでは、巻線の締め付けの程度
を調整することによってばらつきを補正できるが、同時
焼成による積層インダクタでは、内部応力にばらつきを
生じて特性の変動を避けることが非常に難しい。It is known that the magnetic properties of ferrite materials are easily affected by the stress applied to the ferrite material. When stress is applied, the magnetic permeability changes, and the inductance of the inductor changes. In conventional inductors with windings applied to the core, variations can be corrected by adjusting the degree of tightening of the windings. extremely difficult.
【０００５】また、素子を基板に搭載した時の応力、半
田の収縮による応力、基板のたわみによる外部応力によ
ってもインダクタンスが変動する。変動対策として、材
料の組成にガラスを加えたりする方法が考えられている
が、材料の電気的特性の劣化を生じるのが一般的であっ
た。寸法が小さくターン数が限られる積層インダクタで
は、材料の電気的特性を維持することが重要となる。[0005] Further, the inductance varies due to the stress when the element is mounted on the substrate, the stress due to the shrinkage of the solder, and the external stress due to the bending of the substrate. As a countermeasure against the fluctuation, a method of adding glass to the composition of the material has been considered, but generally, the electrical characteristics of the material are deteriorated. In multilayer inductors having small dimensions and a limited number of turns, it is important to maintain the electrical properties of the material.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、900°C以下
の焼成温度でも高い燒結密度を有し、良好な磁器特性を
有するNi−Cu−Zn系フェライト磁性材料を提供するもの
である。積層チップインダクタに用いるときに、電気的
特性および温度特性を損なうことなく、内部及び外部応
力に対して特性の変動が小さい磁性材料を提供するする
ものである。SUMMARY OF THE INVENTION An object of the present invention is to provide a Ni-Cu-Zn ferrite magnetic material having a high sintering density even at a sintering temperature of 900 ° C or less and having good porcelain characteristics. An object of the present invention is to provide a magnetic material having a small variation in characteristics with respect to internal and external stresses without impairing electrical characteristics and temperature characteristics when used in a multilayer chip inductor.
【０００７】[0007]
【課題を解決するための手段】本発明は、SnO２またはS
nO2とLi２CO3を添加することによって、上記の課題を解
決するものである。SUMMARY OF THE INVENTION The present invention is directed to SnO 2 or S
by adding nO2 and Li 2 CO 3, it is intended to solve the foregoing problems.
【０００８】すなわち、NiO：10.44〜44.61mol％，Zn
O：1.05〜31.32mol％、CuO：8.82mol%〜11.90mol%、残
部Fe2O3からなるフェライト材に、SnO2：0.4〜1.8wt％
を含有することを特徴とする。That is, NiO: 10.44 to 44.61 mol%, Zn
O: 1.05~31.32mol%, CuO: 8.82mol % ~11.90mol%, the ferrite material the balance being Fe 2 O 3, SnO 2: 0.4~1.8wt%
It is characterized by containing.
【０００９】あるいは、NiO：10.44〜44.61mol％，Zn
O：1.05〜31.32mol％、CuO：8.82mol%〜11.90mol%、残
部Fe2O3からなるフェライト材に、SnO2：0.4〜1.8wt％
およびLi2CO3：0．3〜0.5wt％を含有することを特徴と
する。Alternatively, NiO: 10.44 to 44.61 mol%, Zn
O: 1.05~31.32mol%, CuO: 8.82mol % ~11.90mol%, the ferrite material the balance being Fe 2 O 3, SnO 2: 0.4~1.8wt%
And Li 2 CO 3 : 0.3 to 0.5 wt%.
【００１０】[0010]
【実施例】以下、本発明の実施例について説明する。本
発明においては、フェライトの基本組成として次の組成
をベースにして添加物を加えてその特性を測定した。 A NiO：44.61mol% ZnO：1.05mol% CuO：8.82mol%
残部Fe2O3 Ｂ NiO：25.96mol% ZnO：16.23mol% CuO：11.90
mol% 残部Fe2O3 C NiO：19.83mol% ZnO：24.12mol% CuO：9.64mo
l% 残部Fe2O3 Ｄ NiO：10.44mol% ZnO：31.32mol% CuO：10.44
mol% 残部Fe2O3 Ｇ NiO：15.84mol% ZnO：27.45mol% CuO：9.50m
ol% 残部Fe2O3 Embodiments of the present invention will be described below. Book
In the invention, the following composition is used as the basic composition of ferrite.
Additives were added and the properties were measured. A NiO: 44.61 mol% ZnO: 1.05 mol% CuO: 8.82 mol%
Balance FeTwoOThree B NiO: 25.96 mol% ZnO: 16.23 mol% CuO: 11.90
mol% balance FeTwoOThree C NiO: 19.83 mol% ZnO: 24.12 mol% CuO: 9.64mo
l% balance FeTwoOThree D NiO: 10.44 mol% ZnO: 31.32 mol% CuO: 10.44
mol% balance FeTwoOThree G NiO: 15.84 mol% ZnO: 27.45 mol% CuO: 9.50 m
ol% balance FeTwoOThree
【００１１】[0011]
【実施例１】上記のＢの基本組成となるように原料酸化
物を秤量し、これにSnO2を0.6〜3.0wt％、Li2CO3を0.15
〜0.75wt％、TiO2を0.3〜1.5wt％の範囲でこれらの1種
を添加したもの、およびLi2CO3を0.3wt％そしてSnO2を
0.6〜3.0wt％の範囲でこれらを併せて添加したものを、
ボールミルで湿式混合を行い、乾燥して原料混合粉を得
た。この原料混合粉を大気中で675°Cで2時間仮焼し、
その後ボールミルにより20時間湿式粉砕を行い、乾燥し
てNi-Cu-Zn系フェライト材料を得た。Example 1 A raw material oxide was weighed so as to have the basic composition of B described above, and 0.6 to 3.0 wt% of SnO 2 and 0.15% of Li 2 CO 3 were added thereto.
~0.75wt%, obtained by adding one of these in the range of TiO 2 0.3 to 1.5%, and 0.3 wt% and SnO 2 and Li2CO3
What added these together in the range of 0.6-3.0 wt%,
The mixture was wet-mixed in a ball mill and dried to obtain a raw material mixed powder. This raw material mixed powder is calcined at 675 ° C for 2 hours in the atmosphere,
Thereafter, wet milling was performed by a ball mill for 20 hours, followed by drying to obtain a Ni-Cu-Zn ferrite material.
【００１２】上記材料を造粒し、プレス成型によりトロ
イダルコア（外径20mm、内径18mm、高さ5mm）および角
型コア（外径20mm、内径13mm、高さ5mm）に成形し、大
気中で890°Cの温度で2時間焼成してNi−Cu−Zn系フェ
ライトのコアを得た。なお、比較のために上記Ｂの基本
組成そのままの材料からなるコアも作製した。The above materials are granulated and formed into a toroidal core (outside diameter 20 mm, inside diameter 18 mm, height 5 mm) and a square core (outside diameter 20 mm, inside diameter 13 mm, height 5 mm) by press molding. The resultant was fired at a temperature of 890 ° C. for 2 hours to obtain a Ni—Cu—Zn ferrite core. For comparison, a core made of the material having the same basic composition of B was also prepared.
【００１３】このようにして作製されたフェライトコア
について、燒結密度、μiac（2MHz時）、Q値（10MH
z）、温度特性（−25〜＋85°C）、加圧変動の評価を行
った。その結果を表１に示す。加圧変動は、図１に示す
ように、角型コアの１辺に20ターンの巻線を施し、巻線
を施した辺をオートグラフにより加圧し、そのときのイ
ンダクタンス値の変動を測定した。表１には、500kgf／
cm2加圧時の結果を示す。With respect to the ferrite core thus manufactured, the sintering density, μ iac (at 2 MHz), Q value (10 MHz)
z), temperature characteristics (−25 to + 85 ° C.), and pressure fluctuation were evaluated. Table 1 shows the results. As shown in FIG. 1, the pressure fluctuation was measured by applying a 20-turn winding to one side of the square core, applying pressure to the side on which the winding was applied by an autograph, and measuring a change in inductance value at that time. . Table 1 shows that 500kgf /
The results at the time of cm 2 pressurization are shown.
【００１４】[0014]
【表１】 [Table 1]
【００１５】表１から明かなように、SnO２、Li2CO3を
添加することによって応力変動は軽減されている。ま
た、SnO2の添加量が増大するにしたがって応力（加圧）
変動は正の方向に増大するが、1.8wt％を超えると焼成
密度が低下して強度確保が困難となるとともに、透磁率
の低下が著しくなる。また、0.4wt％未満では応力変動
の軽減は確認されない場合が多くなるので、上記の範囲
とする。As is clear from Table 1, stress fluctuation is reduced by adding SnO 2 and Li 2 CO 3. In addition, as the amount of SnO 2 added increases, the stress (pressurization) increases.
The fluctuation increases in the positive direction, but if it exceeds 1.8 wt%, the firing density decreases, making it difficult to secure the strength, and significantly lowering the magnetic permeability. If the content is less than 0.4 wt%, the reduction of the stress fluctuation is often not confirmed, so the above range is set.
【００１６】上記のＧの基本組成となるように原料酸化
物を秤量し、これにSnO2を0.5〜1.5wt％の範囲で添加し
たもの、およびSnO2を1.0wt％そしてLi2CO3を0.2〜0.6w
t％の範囲でこれらを添加したものを、上記と同様の工
程でフェライトコアを作製し種々の特性の測定を行なっ
た。測定結果を表２に示す。The weighed raw material oxides so that the basic composition of the above G, which to those with the addition of SnO 2 in the range of 0.5 to 1.5%, and SnO 2 of 1.0 wt% and Li 2 CO 3 0.2-0.6w
Ferrite cores were prepared in the same steps as above by adding these in the range of t%, and various characteristics were measured. Table 2 shows the measurement results.
【００１７】[0017]
【表２】 [Table 2]
【００１８】表１、表２より明らかなように、SnO2とLi
2CO3を複合添加することにより、比較例と同等のμiac
値、Ｑ値を有するにもかかわらず、温度変動、応力変動
が大幅に軽減された材料が得られている。複合添加時に
おいてSnＯ2の添加量が増大するにつれて正の方向に増
大する。1.8wt％を超えて添加するとμiac値の低下が著
しく、また、0.4wt％未満では応力変動の軽減は確認さ
れない。また、Li2CO3においては添加量が0.3〜0.6wt％
の範囲外ではμiac値の低下が著しい。したがって、複
合添加時の範囲はSnO2の添加量は0.4〜1.8wt％、Li2CO3
の添加量は0.3〜0.5wt％の範囲とする。なお、図２に試
料17と比較例とのQ値の周波数変動を示したが、添加に
よるQ値の劣化は見られない。As is clear from Tables 1 and 2, SnO 2 and Li
By adding 2CO3 in combination, μ iac equivalent to the comparative example
Despite having a value and a Q value, a material with significantly reduced temperature fluctuation and stress fluctuation is obtained. At the time of composite addition, the amount increases in the positive direction as the added amount of SnO 2 increases. When added in excess of 1.8 wt%, the μ iac value is significantly reduced, and when it is less than 0.4 wt%, reduction in stress fluctuation is not confirmed. For Li 2 CO 3 , the addition amount is 0.3 to 0.6 wt%.
Outside the range, the μ iac value is significantly reduced. Therefore, the range at the time of addition of the composite is 0.4 to 1.8 wt% of SnO 2 , Li 2 CO 3
Is in the range of 0.3 to 0.5 wt%. FIG. 2 shows the frequency fluctuation of the Q value between the sample 17 and the comparative example, but no deterioration of the Q value due to the addition is observed.
【００１９】試料17の材料を用いてドクターブレード法
によりシート化し、銀を内部導体を銀とする積層チップ
インダクタを作製した。比較例の材料でも同等に積層チ
ップインダクタを作製した。素子の焼成は大気中で890
°Ｃで２時間とした。素子の形状は、0.8mm×0.8mm×1.
6mmで巻数は14ターンとした。A sheet was formed by the doctor blade method using the material of Sample 17, and a multilayer chip inductor using silver as an internal conductor was produced. A multilayer chip inductor was similarly manufactured using the material of the comparative example. Element firing in air at 890
C. for 2 hours. The element shape is 0.8mm x 0.8mm x 1.
The number of turns was 14 turns at 6 mm.
【００２０】このようにして得られた積層チップインダ
クタについて測定周波数10MHzにおけるインダクタンス
値、Ｑ値および直流抵抗を求めた。その結果を表３に示
す。With respect to the multilayer chip inductor thus obtained, the inductance value, Q value and DC resistance at a measurement frequency of 10 MHz were determined. Table 3 shows the results.
【００２１】[0021]
【表３】 [Table 3]
【００２２】表３に示したように積層チップインダクタ
に使用したときの電気的特性は比較例とほぼ同様となっ
ている。As shown in Table 3, the electrical characteristics when used in the multilayer chip inductor are almost the same as those of the comparative example.
【００２３】作製された素子を、図３に示したように、
ガラス基材エポキシ樹脂基板（100mm×40mm×0.8mm）に
実装し、測定用端子として30mmのリード線を装着し、応
力試験用のサンプルとした。測定用のサンプルを、図４
に示すように、支点間90mmとして中心部分を加圧し、そ
のたわみ量とインダクタンス値の変動を測定した。その
結果を示したのが図５であり、実施例の素子は比較例の
素子に比較して外部応力に対する変動が大幅に軽減され
ていることが確認された。また、たわみを解放した後の
復帰値の変動も軽減されている。As shown in FIG. 3, the fabricated device was
The sample was mounted on a glass substrate epoxy resin substrate (100 mm x 40 mm x 0.8 mm), and a 30 mm lead wire was attached as a measuring terminal, thereby forming a sample for a stress test. The sample for measurement is shown in FIG.
As shown in (2), the central portion was pressurized with the distance between the fulcrums 90 mm, and the amount of deflection and the variation in inductance value were measured. FIG. 5 shows the results, and it was confirmed that the element of the example had a significantly reduced variation with respect to the external stress as compared with the element of the comparative example. Further, the fluctuation of the return value after releasing the deflection is also reduced.
【００２４】上記の例は基本組成がＢの材料に添加物を
加えたものであるが、前記の基本組成Ａ，Ｃ，Ｇについ
てSnO2、Li2CO3を添加したときのデータを表３から表６
に示す。いずれにおいても本発明による所定範囲の添加
による応力変動および温度特性変動の防止の効果が確認
された。In the above example, an additive is added to a material having a basic composition of B. Tables 3 to 6 show data obtained when SnO 2 and Li2CO3 are added to the above basic compositions A, C and G.
Shown in In each case, the effect of preventing stress fluctuation and temperature characteristic fluctuation by addition of a predetermined range according to the present invention was confirmed.
【００２５】[0025]
【表４】 [Table 4]
【００２６】[0026]
【表５】 [Table 5]
【００２７】[0027]
【表６】 [Table 6]
【００２８】なお、SnO2とLi2CO3はフェライトの基本組
成によっては、前記の範囲を若干外れた添加量でも特性
的に満足できるものもあるが、共通して一定の特性を確
保するためには前記の添加量の範囲とすることが好まし
い。It should be noted that SnO 2 and Li 2 CO 3 may be characteristically satisfactory depending on the basic composition of ferrite even if they are added slightly outside the above range, but are commonly used to secure certain characteristics. Is preferably within the above-mentioned range.
【００２９】[0029]
【発明の効果】本発明によれば、低温焼成材料でありな
がら、外部応力、温度に対して極めて安定した電気的特
性を有するNi−Cu−Zn系フェライト磁性材料が得られ
る。また、この材料を積層チップインダクタだけでな
く、巻線タイプのインダクタに利用することもできる。According to the present invention, it is possible to obtain a Ni-Cu-Zn ferrite magnetic material which is a low-temperature fired material and has extremely stable electric characteristics with respect to external stress and temperature. In addition, this material can be used not only for a multilayer chip inductor but also for a winding type inductor.
【図１】 測定方法を示す説明図FIG. 1 is an explanatory diagram showing a measuring method.
【図２】 本発明の特性の説明図FIG. 2 is an explanatory diagram of characteristics of the present invention.
【図３】 測定方法を示す平面図FIG. 3 is a plan view showing a measuring method.
【図４】 測定方法を示す正面図FIG. 4 is a front view showing a measuring method.
【図５】 本発明により得られた積層チップインダクタ
の特性の説明図FIG. 5 is a diagram illustrating characteristics of a multilayer chip inductor obtained according to the present invention.
Claims (2)
1.32mol％、CuO：8.82mol% 〜11.90mol%、残部Fe2O3か
らなるフェライト材に、SnO2：0.4〜1.8wt％を含有する
Ni−Cu−Zn系フェライト磁性材料。1. NiO: 10.44 to 44.61 mol%, ZnO: 1.05 to 3
1.32mol%, CuO: 8.82mol% ~11.90mol %, the ferrite material the balance being Fe 2 O 3, SnO 2: containing 0.4～1.8Wt%
Ni-Cu-Zn ferrite magnetic material.
1.32mol％、CuO：8.82mol% 〜11.90mol%、残部Fe2O3か
らなるフェライト材に、SnO2：0.4〜1.8wt％およびLi2C
O3：0．3〜0.5wt％を含有するNi−Cu−Zn系フェライト
磁性材料。2. NiO: 10.44 to 44.61 mol%, ZnO: 1.05 to 3
1.32mol%, CuO: 8.82mol% ~11.90mol %, the ferrite material the balance being Fe 2 O 3, SnO 2: 0.4~1.8wt% and Li 2 C
O 3: Ni-Cu-Zn ferrite magnetic material containing 0.3~0.5wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000313072A JP4384346B2 (en) | 2000-10-13 | 2000-10-13 | Ni-Cu-Zn ferrite magnetic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| JP2000313072A JP4384346B2 (en) | 2000-10-13 | 2000-10-13 | Ni-Cu-Zn ferrite magnetic material |
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| JP2002124408A true JP2002124408A (en) | 2002-04-26 |
| JP4384346B2 JP4384346B2 (en) | 2009-12-16 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002255637A (en) * | 2001-02-23 | 2002-09-11 | Murata Mfg Co Ltd | Oxide magnetic ceramic composition and inductor component using the composition |
| WO2008133152A1 (en) * | 2007-04-17 | 2008-11-06 | Hitachi Metals, Ltd. | Low-loss ferrite, and electronic component using the same |
| US7527744B2 (en) | 2005-12-21 | 2009-05-05 | Tdk Corporation | NiCuZn-base ferrites and electronic parts using the same |
| JPWO2008096795A1 (en) * | 2007-02-07 | 2010-05-27 | 日立金属株式会社 | Low loss ferrite and electronic parts using the same |
| WO2012173147A1 (en) * | 2011-06-15 | 2012-12-20 | 株式会社 村田製作所 | Laminated coil component and method for manufacturing said laminated coil component |
| WO2015064693A1 (en) | 2013-10-31 | 2015-05-07 | 戸田工業株式会社 | Ferrite sintered body, ferrite sintered plate, and ferrite sintered sheet |
-
2000
- 2000-10-13 JP JP2000313072A patent/JP4384346B2/en not_active Expired - Lifetime
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002255637A (en) * | 2001-02-23 | 2002-09-11 | Murata Mfg Co Ltd | Oxide magnetic ceramic composition and inductor component using the composition |
| JP4576727B2 (en) * | 2001-02-23 | 2010-11-10 | 株式会社村田製作所 | Oxide magnetic ceramic composition and inductor component using the same |
| US7527744B2 (en) | 2005-12-21 | 2009-05-05 | Tdk Corporation | NiCuZn-base ferrites and electronic parts using the same |
| JPWO2008096795A1 (en) * | 2007-02-07 | 2010-05-27 | 日立金属株式会社 | Low loss ferrite and electronic parts using the same |
| US8164410B2 (en) | 2007-04-17 | 2012-04-24 | Hitachi Metals, Ltd. | Low-loss ferrite and electronic device formed by such ferrite |
| EP2141137A1 (en) * | 2007-04-17 | 2010-01-06 | Hitachi Metals, Ltd. | Low-loss ferrite, and electronic component using the same |
| WO2008133152A1 (en) * | 2007-04-17 | 2008-11-06 | Hitachi Metals, Ltd. | Low-loss ferrite, and electronic component using the same |
| EP2141137A4 (en) * | 2007-04-17 | 2012-09-12 | Hitachi Metals Ltd | Low-loss ferrite, and electronic component using the same |
| JP5841312B2 (en) * | 2007-04-17 | 2016-01-13 | 日立金属株式会社 | Low loss ferrite and electronic parts using the same |
| WO2012173147A1 (en) * | 2011-06-15 | 2012-12-20 | 株式会社 村田製作所 | Laminated coil component and method for manufacturing said laminated coil component |
| JPWO2012173147A1 (en) * | 2011-06-15 | 2015-02-23 | 株式会社村田製作所 | Multilayer coil component and method for manufacturing the multilayer coil component |
| US9281113B2 (en) | 2011-06-15 | 2016-03-08 | Murata Manufacturing Co., Ltd. | Laminated coil component, and method of manufacturing the laminated coil component |
| WO2015064693A1 (en) | 2013-10-31 | 2015-05-07 | 戸田工業株式会社 | Ferrite sintered body, ferrite sintered plate, and ferrite sintered sheet |
| KR20160079787A (en) | 2013-10-31 | 2016-07-06 | 도다 고교 가부시끼가이샤 | Ferrite sintered body, ferrite sintered plate, and ferrite sintered sheet |
| US10128029B2 (en) | 2013-10-31 | 2018-11-13 | Toda Kogyo Corp. | Ferrite ceramics, ferrite sintered plate and ferrite sintered sheet |
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