WO2010016154A1 - 磁気記録用金属磁性粉およびその製造法 - Google Patents
磁気記録用金属磁性粉およびその製造法 Download PDFInfo
- Publication number
- WO2010016154A1 WO2010016154A1 PCT/JP2008/064390 JP2008064390W WO2010016154A1 WO 2010016154 A1 WO2010016154 A1 WO 2010016154A1 JP 2008064390 W JP2008064390 W JP 2008064390W WO 2010016154 A1 WO2010016154 A1 WO 2010016154A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- metal
- child
- rare earth
- particles
- particle
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/714—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the dimension of the magnetic particles
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
- G11B5/70605—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material metals or alloys
- G11B5/70615—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material metals or alloys containing Fe metal or alloys
-
- 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
- H01F1/0036—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties showing low dimensional magnetism, i.e. spin rearrangements due to a restriction of dimensions, e.g. showing giant magnetoresistivity
- H01F1/0045—Zero dimensional, e.g. nanoparticles, soft nanoparticles for medical/biological use
- H01F1/0054—Coated nanoparticles, e.g. nanoparticles coated with organic surfactant
-
- 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
- H01F1/032—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 hard-magnetic materials
- H01F1/09—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 hard-magnetic materials mixtures of metallic and non-metallic particles; metallic particles having oxide skin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
-
- 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
- H01F1/032—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 hard-magnetic materials
- H01F1/04—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 hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
Definitions
- the present invention relates to a metal suitable for high-density gas recording and a manufacturing method thereof.
- the particle adhesion is prevented, the dispersibility is improved, and the magnetic recording medium and the surface property are improved in order to improve the magnetic recording surface and the surface property. It is taught to contain.
- the roller is sometimes added to the raw material for the purpose of preventing the heat at the beginning of heating, and the metal synthesized through the heating source has already finished its role, reducing the However, if it is possible to remove the metal contained in the metal, it is possible to increase the relative amount of the sex while achieving the stopping, and the magnetic magnetization of the fine particles can be increased. The bottom is considered to be suppressed. In addition, as a cause of the phenomenon in the gas recording medium, the influence of the presence on the particle surface can be considered, and it is effective to remove this also.
- an object of the present invention is to provide a magnetic metal powder that has high properties even in the case of fine particles.
- the particle n is 4F below and 2 above, and the particle is made of a gas recording metal composed of rounded particles.
- the diameter of the major axis is larger than the minor axis 6.
- it is a metal composed of a metal having or as a main component and particles having and having n to 45 of its child, that is, its child's short axis) is 2 and rare earth element is Y but also rare earth element
- the value of the element content () in the metal element () is used (R s) (under e 20, particle child microscope).
- a gas-recording metal is provided that has a size of 90 above the minor axis.
- those having a child volume ⁇ containing less than 500 3 are suitable targets.
- the direction perpendicular to the major axis in the image of the particle is called the minor axis direction
- the diameter of the longest part in the direction of the child is the minor axis.
- the particle size of the particle whose total shape can be confirmed is randomly measured at 300, and is calculated using the measured number of children as the denominator.
- the number of particles whose overall shape can be confirmed is measured at 2 randomly, and is calculated using the measured number of children as the denominator.
- (S) in the field of Oe is X 0 to, or is further oxidized, and the approximated child volume is 5000 3 (under 5 X 0, the activation volume determined by the powder X 2X C
- V E and V are provided to satisfy the following formula (3).
- Ming has a metal whose main component is e or eCO, rare earth (Y is also a rare earth element), A and S.
- a metal powder comprising particles containing the above Among these, a process that elutes the powder particles by reacting with the base agent in the form of the body and containing the agent, and the heat treatment process in the gas atmosphere.
- an air-recording metal that performs a process of sequentially performing a (chemical process) and a heat-treating process in an oxidizing gas atmosphere (stabilizing process). It is preferable to insert a process (process) that forms an oxide on the surface of the powder particle between the process and the process. More than sodium tartrate and kun sodium can be used as agents, and hydrazine (), thiaum umide (
- sodium chloride () and its conductors can be used.
- the particle obtained through this work is a particle characterized by the fact that the particle is on 2 and the particle always has a curvature, and is also a child of the particle. Particles having such a configuration are preferred because when they are arranged in a magnetic field, collisions between the children are reduced and the probability is high. It should be on the order of 80, more preferably 9 on particles that have a more external appearance to the child of the body.
- the metal powder consisting of e or e Co as a main component is also a child. That is, among the sex elements e C) constituting the metal, the number of atoms added by e or e Co is over 50. Also, The target is the one that has this oxidation, and the ratio of the elements present in the body including the metal oxide is 0 (50) a (CO and Co) of CO to e.
- Co e CO content (a) content () X 00 is expressed. Co e of 5 to 45 is more preferred, and up to 40 a. In this range, stable properties can be easily obtained. Although chemicals are detected, it is not necessary even if chemicals of other elements exist at the same time.
- earth also as rare earth
- S Co 20a under It is.
- R S e Co
- Elements such as e Co, earth (also rare earth elements), AS, and other elements that constitute the child are mixed, for example, the elements of the added aca group element.
- eCo also as rare earth
- the maximum force und number earth e and e calculated by using the leeks X analysis (for example, S) attached to is 0, 5 or 0 3 lower, respectively. In the case of such a large value, this means that there is a large amount in the part of the particle, which is not preferable because it is magnetic.
- a child satisfying the above-mentioned formula (2) is a particularly suitable target for the metal powder existing on 70.
- the average is 0 to 45, preferably 0 to 35, and the child volume is below 5 3 or 4500 3. If the size is larger than this, it will be difficult to adequately cope with the magnetic tape recording.
- the diameter of the major axis is such that the minor axis occupies 9 on the minor axis at both ends in the particle image.
- Examples of powders that have a large number of powdered children include those in which there are 50 or more children satisfying the formula B ().
- the ratio of the physical volume of the particle calculated by the cylindrical model (if the model) from the short axis length to the above-mentioned characterization volume is less than 2.
- the combination of the rare earth and S components that do not contribute to the properties is small, which is advantageous in terms of magnetic properties.
- the volume of particles by a cylinder (or mode). The ratio is minimum, but here the actual measurement VE is used for the latter, so there are cases where the calculation is less than. This ratio is close to, because it shows that the activation volumes are almost the same, and that the components that do not affect the recording can be formed very little. On the contrary, if this value is too large, there are many cases, and it is suitable for high-density gas recording.
- the raw materials with added can be used for common metals until the original stage.
- the metal powder containing e as a main component is obtained from this compound by vapor phase generation. This end is called the former.
- the out-treatment process it is necessary to take out the amount derived from (the out-treatment process).
- the reaction may become non-uniform, but usually results are obtained by treatment at ⁇ 00 degrees, preferably 5 ⁇ 50 degrees.
- the base agent is processed and added.
- substances known as base agents such as hydrazine (2) thianium idride () and sodium hydride (B) are used.
- the use of a weakening agent is preferred because it tends to cause the generation of sex elements.
- the base agent is too thick
- the metal powder that has been subjected to the treatment process is subjected to a process of forming an acid in the child layer as necessary.
- the method is not limited to that, and a conventionally known method can be adopted. That is, it may be performed by a wet method in which an oxide is added to the liquid used for the above-mentioned extraction treatment, or may be processed by a formula method after separation and extraction from the above-mentioned extraction treatment liquid.
- the powder may be in an unstable state, so care must be taken when handling it.
- a particle having a rounded particle tip can be obtained. It can be carried out by heat treatment in a return atmosphere such as hydrogen gas. It is desirable to increase the temperature by 50oC, but the temperature is likely to be too high. Therefore, it is necessary to do the following at 350, and the range below 30C is preferable. It can also be carried out by heat treatment in a stabilized oxidizing gas atmosphere. This is likely to occur if the degree is too high, so it is desirable to go within the range of 50 to 350C.
- Sphere On top of the Qi record, Sphere has as a lower layer and above it as an upper layer. Used in combination to form a bright upper layer.
- It can be prepared by mixing layers and lower layer materials and materials at a predetermined ratio and using a da and a sand grinder. It is preferable to use a so-called “Won-Woo” method in which the upper layer is applied as much as possible to the lower layer as much as possible.
- the following can be exemplified as the recording material.
- Stein such as Botinte Fra, Vorintato, Boffins, Sest Acetate, Carbonate, Pode, Bo, Poado, Bosphone Alla, Boado, Giving a tree such as You can.
- the iron oxyoxide was grown by continuing the addition of the 20 am solution at an acceleration of 5.0 at a temperature of A. Furthermore, oxygen was continued to flow at 50 to complete the oxidation. In addition, take a small amount of the supernatant liquid of oxidation and use the liquid of xylan oxide to confirm that does not change. Later.
- the iron oxide cake was passed through a conventional method, washed with water, and dried at 3 ° C to obtain iron oxide. This was put into a kettle, and a chemical compound containing iron oxide (tight) as a main component was obtained at 40 C in the atmosphere while adding water vapor as water.
- This iron is put into a breathable ket, and the ket is inserted through, and hydrogen gas (40) is ventilated. Was given. After the original time, the supply of water vapor was stopped, and the hydrogen atmosphere was 600 C until 0 Cm. Then, water was added and water was added every time, and the process was performed for 60 minutes to produce metal (gold powder). The floor of this floor has not yet been formed (), and this earlier and later
- the metal powder corresponding to the original was subjected to elution treatment as follows.
- sodium tartrate was mixed to 0.05, then ammonium was adjusted to 0.
- the metal corresponding to the former was added in the above manner, the temperature was maintained at 80 C, and then sodium iodide was added to become 0 3 o as a starting agent. This was done at 30 C while being 30, and a slurry was obtained. The slurry was separated and the solid-formation liquid was recovered. This formation was passed, washed with water, dried and dried.
- the powder after oxidation formation by the above-mentioned theory was processed by using an atmosphere of 2500.
- the stabilization process was implemented by implementing the same method as above.
- the metal powder obtained in this way was adjusted as described below.
- JEOL Ltd. JE 0OCX ak type was used, and a bright field observation was performed at a high voltage of 00 V.
- the image is projected at 58,000 times and enlarged, for example, 9 times.
- Measurement was performed with an external 0 Oe (795 8) using a VS (S 7P) manufactured by a formula company.
- the magnetic number was determined by the external Oe method.
- the amount of the body containing metal oxide was analyzed.
- an earth element including Co and earth Y a frequency rasp light analysis CP P) manufactured by Nippon Assy Co., Ltd. was used, and an apparatus (CO 980) manufactured by Hiranuma Corporation of e was used. Since these masses are given, Co e, (e Co, Y (e Co), (RAS e Co) were obtained by converting to (). Co is
- the electron beam level was set at a position 5 away from the tip of the child. This corresponds to the part of the image of the particle where the metal is considered to be out of the part of the comparative brightness, and it is thought that the oxide or the part is the main part.
- the pot lid is opened, the nimbo is removed, the charge is put into the stibo adapter (55), and the spum (potimim made by the formula company, brand name 5C B50, 5) Place a cloth on top. , Put it on a 5 ⁇ 5G b, and get a magnetic field.
- the stibo adapter 55
- the spum potimim made by the formula company, brand name 5C B50, 5
- a metal powder was obtained in the same manner as in the implementation except that the raw material was changed during the formation process of iron oxide. Using this, the same setting was made (the same applies below). >>
- a metal powder was obtained in the same manner as in the practice except that the raw material was changed during the synthesis of iron iron and the procedure was not carried out. In this case, the process after the above was not taken out of the battery, and the process was shifted to a physical process by switching the atmosphere to hydrogen.
- a metal powder was obtained in the same manner as in Example 1 except that the raw material was changed during the iron oxyoxide formation process.
- the e degree ratio was 0 ⁇ 765 Y e degree ratio was 0706 at the place of (A).
- a low degree of X (0 ⁇ X) is obtained at S a e ⁇ 4 at (Oe).
- the major axis (1) is as large as 50 and above.
- E5 in Reference 3 is the long axis 4 and is relatively of diameter 35 at the end of this application.
- the long axis has a relatively sharp shape because it is not processed.
- the long axis has a rounded shape with a narrow direction in the implementation after the out-processing, and finally re- and stabilization processing.
- the ratio obtained by the comparison 2 was less than 50. It was 90 on the end.
- the value obtained in the comparison 2 was 50, but the value obtained in Example 2 was 50. This rounded end shape is considered to have an advantageous effect on improving the performance.
- Figure 2 shows the S-spectrum (localized by dividing by the number of powerful undes of e) when the local composition analysis was performed on the particles in the metal powder obtained in Example 2 and Comparison 2. Illustrate. Corresponds to A to C described above.
- the comparative one has a high degree of Y and does not satisfy the above equation (2).
- the implementation which performed the outgoing processing satisfies the above equation (2).
- the comparison 2 of the children satisfying the above equation (2) was 5 in other words. No observations satisfying Eq. (2).
- implementation 2 was above 70.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Nanotechnology (AREA)
- Metallurgy (AREA)
- Molecular Biology (AREA)
- Biomedical Technology (AREA)
- General Health & Medical Sciences (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Hard Magnetic Materials (AREA)
- Powder Metallurgy (AREA)
- Magnetic Record Carriers (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/055,948 US20110123830A1 (en) | 2008-08-05 | 2008-08-05 | Metallic magnetic powder for magnetic recording and process for producing the metallic magnetic powder |
EP08792373A EP2320435A4 (en) | 2008-08-05 | 2008-08-05 | METAL MAGNETIC POWDER FOR MAGNETIC RECORDING AND PROCESS FOR MANUFACTURING THE METAL MAGNET POWDER |
CN200880130544.2A CN102138189B (zh) | 2008-08-05 | 2008-08-05 | 磁记录用金属磁性粉及其制造方法 |
PCT/JP2008/064390 WO2010016154A1 (ja) | 2008-08-05 | 2008-08-05 | 磁気記録用金属磁性粉およびその製造法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2008/064390 WO2010016154A1 (ja) | 2008-08-05 | 2008-08-05 | 磁気記録用金属磁性粉およびその製造法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010016154A1 true WO2010016154A1 (ja) | 2010-02-11 |
Family
ID=41663383
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2008/064390 WO2010016154A1 (ja) | 2008-08-05 | 2008-08-05 | 磁気記録用金属磁性粉およびその製造法 |
Country Status (4)
Country | Link |
---|---|
US (1) | US20110123830A1 (ja) |
EP (1) | EP2320435A4 (ja) |
CN (1) | CN102138189B (ja) |
WO (1) | WO2010016154A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011125914A1 (ja) * | 2010-03-31 | 2011-10-13 | Dowaエレクトロニクス株式会社 | 金属磁性粉末およびその製造方法、磁性塗料、並びに磁気記録媒体 |
CN102240802A (zh) * | 2010-05-12 | 2011-11-16 | 亚利桑那大学董事会 | 金属磁性粉末及其制造方法、磁性涂料、磁疗用磁性粉末以及磁记录介质 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4758858B2 (ja) * | 2006-03-28 | 2011-08-31 | Dowaエレクトロニクス株式会社 | 磁気記録媒体用金属磁性粉末およびその製造法 |
JP5799042B2 (ja) * | 2013-03-07 | 2015-10-21 | 富士フイルム株式会社 | 磁気記録媒体およびその製造方法 |
JP5770771B2 (ja) * | 2013-03-25 | 2015-08-26 | 富士フイルム株式会社 | 六方晶フェライト磁性粉末およびその製造方法、ならびに磁気記録媒体 |
JP7172091B2 (ja) * | 2018-03-28 | 2022-11-16 | Tdk株式会社 | 複合磁性体 |
US11682510B2 (en) * | 2019-02-21 | 2023-06-20 | Tdk Corporation | Composite magnetic material, magnetic core, and electronic component |
CN116825468B (zh) * | 2023-08-04 | 2024-01-12 | 广东泛瑞新材料有限公司 | 一种铁钴磁芯及其制备方法和应用 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002289145A (ja) * | 2001-03-28 | 2002-10-04 | West Electric Co Ltd | 放電管および電源接続線付放電管 |
JP2003296915A (ja) | 2002-03-29 | 2003-10-17 | Tdk Corp | 磁気記録媒体 |
JP2004035939A (ja) * | 2002-07-02 | 2004-02-05 | Toda Kogyo Corp | 磁気記録用紡錘状合金磁性粒子粉末及びその製造法 |
JP2005276361A (ja) | 2004-03-25 | 2005-10-06 | Fuji Photo Film Co Ltd | 磁気記録媒体およびこれを用いた磁気記録再生方法 |
JP2006128535A (ja) | 2004-11-01 | 2006-05-18 | Dowa Mining Co Ltd | 金属磁性粉末およびそれを用いた磁気記録媒体 |
JP2007257713A (ja) * | 2006-03-22 | 2007-10-04 | Fujifilm Corp | 磁気記録媒体 |
JP2007294841A (ja) * | 2006-03-28 | 2007-11-08 | Dowa Electronics Materials Co Ltd | 磁気記録媒体用金属磁性粉末およびその製造法 |
JP2008270300A (ja) * | 2007-04-16 | 2008-11-06 | Dowa Electronics Materials Co Ltd | 磁気記録用金属磁性粉およびその製造法 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3473877B2 (ja) * | 1995-10-13 | 2003-12-08 | 富士写真フイルム株式会社 | 磁気記録媒体 |
JP2003132519A (ja) * | 2001-10-25 | 2003-05-09 | Hitachi Ltd | 磁性ナノ粒子で形成された磁気記録媒体およびそれを用いた記録方法 |
JP2005259929A (ja) * | 2004-03-11 | 2005-09-22 | Fuji Photo Film Co Ltd | 強磁性金属粉末およびそれを含む磁気記録媒体 |
JP4677734B2 (ja) * | 2004-04-19 | 2011-04-27 | Dowaエレクトロニクス株式会社 | 磁気記録媒体用磁性粉末 |
CN101064205B (zh) * | 2006-03-28 | 2013-04-03 | 同和电子科技有限公司 | 磁记录介质用金属磁性粉末及其制造方法 |
CN100455994C (zh) * | 2006-12-11 | 2009-01-28 | 周岳建 | 一种滴水表 |
-
2008
- 2008-08-05 CN CN200880130544.2A patent/CN102138189B/zh not_active Expired - Fee Related
- 2008-08-05 EP EP08792373A patent/EP2320435A4/en not_active Withdrawn
- 2008-08-05 WO PCT/JP2008/064390 patent/WO2010016154A1/ja active Application Filing
- 2008-08-05 US US13/055,948 patent/US20110123830A1/en not_active Abandoned
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002289145A (ja) * | 2001-03-28 | 2002-10-04 | West Electric Co Ltd | 放電管および電源接続線付放電管 |
JP2003296915A (ja) | 2002-03-29 | 2003-10-17 | Tdk Corp | 磁気記録媒体 |
JP2004035939A (ja) * | 2002-07-02 | 2004-02-05 | Toda Kogyo Corp | 磁気記録用紡錘状合金磁性粒子粉末及びその製造法 |
JP2005276361A (ja) | 2004-03-25 | 2005-10-06 | Fuji Photo Film Co Ltd | 磁気記録媒体およびこれを用いた磁気記録再生方法 |
JP2006128535A (ja) | 2004-11-01 | 2006-05-18 | Dowa Mining Co Ltd | 金属磁性粉末およびそれを用いた磁気記録媒体 |
JP2007257713A (ja) * | 2006-03-22 | 2007-10-04 | Fujifilm Corp | 磁気記録媒体 |
JP2007294841A (ja) * | 2006-03-28 | 2007-11-08 | Dowa Electronics Materials Co Ltd | 磁気記録媒体用金属磁性粉末およびその製造法 |
JP2008270300A (ja) * | 2007-04-16 | 2008-11-06 | Dowa Electronics Materials Co Ltd | 磁気記録用金属磁性粉およびその製造法 |
Non-Patent Citations (2)
Title |
---|
S. J. F. CHADWICK ET AL., JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2005, pages 134 - 137 |
See also references of EP2320435A4 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011125914A1 (ja) * | 2010-03-31 | 2011-10-13 | Dowaエレクトロニクス株式会社 | 金属磁性粉末およびその製造方法、磁性塗料、並びに磁気記録媒体 |
JP5731483B2 (ja) * | 2010-03-31 | 2015-06-10 | Dowaエレクトロニクス株式会社 | 金属磁性粉末およびその製造方法、磁性塗料、並びに磁気記録媒体 |
EP2555194A4 (en) * | 2010-03-31 | 2016-01-27 | Dowa Electronics Materials Co | METAL MAGNETIC POWDER, METHOD FOR THE PRODUCTION THEREOF, MAGNETIC COATING COMPOSITION AND MAGNETIC RECORDING MEDIUM |
US9311947B2 (en) | 2010-03-31 | 2016-04-12 | Dowa Electronics Materials Co., Ltd. | Metal magnetic powder and process for producing the same, magnetic coating material, and magnetic recording medium |
CN102240802A (zh) * | 2010-05-12 | 2011-11-16 | 亚利桑那大学董事会 | 金属磁性粉末及其制造方法、磁性涂料、磁疗用磁性粉末以及磁记录介质 |
Also Published As
Publication number | Publication date |
---|---|
EP2320435A1 (en) | 2011-05-11 |
US20110123830A1 (en) | 2011-05-26 |
CN102138189A (zh) | 2011-07-27 |
EP2320435A4 (en) | 2011-08-03 |
CN102138189B (zh) | 2014-04-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2010016154A1 (ja) | 磁気記録用金属磁性粉およびその製造法 | |
JP6821335B2 (ja) | イプシロン酸化鉄とその製造方法、磁性塗料および磁気記録媒体 | |
JP6845491B2 (ja) | サマリウム−鉄−窒素磁石粉末及びその製造方法 | |
JP6724972B2 (ja) | 異方性磁性粉末の製造方法 | |
JP2017201672A (ja) | 磁性粉末の製造方法 | |
KR101918881B1 (ko) | 금속 자성 분말 및 이의 제조방법, 자성 도료, 및 자기 기록매체 | |
JP4505638B2 (ja) | 金属磁性粉末およびそれを用いた磁気記録媒体 | |
WO2016199937A1 (ja) | イプシロン酸化鉄とその製造方法、磁性塗料および磁気記録媒体 | |
JP2020013887A (ja) | 合金粒子の製造方法および合金粒子 | |
JP2006219353A (ja) | マグネタイト微粒子の製造方法 | |
JP4758936B2 (ja) | 磁気記録用金属磁性粉およびその製造法 | |
JP4677734B2 (ja) | 磁気記録媒体用磁性粉末 | |
JPS6135135B2 (ja) | ||
JPS6411577B2 (ja) | ||
JPH03174704A (ja) | 強磁性金属粒子およびその製法 | |
JP2015224167A (ja) | 板状ヘマタイト微粒子、板状ヘマタイト複合体、板状鉄微粒子、及び板状酸化鉄微粒子 | |
JPS5921922B2 (ja) | 針状晶Fe−Co−Zn合金磁性粒子粉末の製造法 | |
JP2015225998A (ja) | 針状ゲーサイト微粒子、針状ゲーサイト複合体、針状鉄微粒子、及び針状酸化鉄微粒子 | |
JP2001192211A (ja) | 鉄を主成分とする化合物粒子粉末の製造法 | |
JP3141907B2 (ja) | 紡錘状を呈した鉄を主成分とする金属磁性粒子粉末の製造法 | |
JPH0651574B2 (ja) | 紡錘型を呈した磁性酸化鉄粒子粉末の製造法 | |
JPS58151333A (ja) | 針状晶酸化鉄粒子粉末の製造法 | |
JPS6172628A (ja) | 短冊状を呈したゲ−タイト粒子粉末の製造法 | |
JP2019102777A (ja) | 複合磁性体の製造方法および複合磁性体ならびにそれを用いた磁性塗料および磁性部品 | |
JP2008084900A (ja) | 塗布型磁気記録媒体用磁性粉末およびその製法並びに磁気記録媒体 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200880130544.2 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 08792373 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 13055948 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2008792373 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
NENP | Non-entry into the national phase |
Ref country code: JP |