WO2016199937A1 - Oxyde de fer epsilon et procédé de production associé, peinture magnétique, et support d'enregistrement magnétique - Google Patents

Oxyde de fer epsilon et procédé de production associé, peinture magnétique, et support d'enregistrement magnétique Download PDF

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WO2016199937A1
WO2016199937A1 PCT/JP2016/067554 JP2016067554W WO2016199937A1 WO 2016199937 A1 WO2016199937 A1 WO 2016199937A1 JP 2016067554 W JP2016067554 W JP 2016067554W WO 2016199937 A1 WO2016199937 A1 WO 2016199937A1
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Prior art keywords
iron oxide
epsilon
epsilon iron
value
hydroxide
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PCT/JP2016/067554
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English (en)
Japanese (ja)
Inventor
慎一 大越
俊介 岡
飛鳥 生井
憲司 正田
Original Assignee
国立大学法人 東京大学
Ｄｏｗａエレクトロニクス株式会社
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Priority to US15/735,410 priority Critical patent/US10807880B2/en
Priority to EP16807640.4A priority patent/EP3309128A4/fr
Priority to CN201680030678.1A priority patent/CN107635924B/zh
Priority claimed from JP2016116784A external-priority patent/JP6821335B2/ja
Publication of WO2016199937A1 publication Critical patent/WO2016199937A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • 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
    • H01F1/10—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
    • H01F1/11—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles

Definitions

  • the present invention relates to an epsilon iron oxide applied to a high-density magnetic recording medium, a radio wave absorber, and the like, a manufacturing method thereof, a magnetic paint and a magnetic recording medium using the epsilon iron oxide.
  • the magnetic recording medium In order to achieve high recording density in magnetic recording media, it is necessary to reduce the recording unit. It is also necessary for the magnetic recording medium to be maintained in a ferromagnetic state under a normal environment where it is exposed during storage and use, for example, at room temperature.
  • the stability of magnetization with respect to heat is considered to be proportional to the magnetic anisotropy constant and the particle volume.
  • the magnetic anisotropy constant can be increased by increasing the coercive force of the magnetic recording medium. Therefore, in order to obtain particles having a small particle volume and high thermal stability, it is considered effective to use a substance having a high coercive force as a magnetic material.
  • the present inventors have found epsilon iron oxide as a material that develops a huge coercive force of 20 kOe under room temperature conditions even though it is nano-order particles, and published it as Non-Patent Document 1. Further, it has been found that the coercive force can be controlled by substituting a part of the iron element of the epsilon iron oxide with a metal element different from iron, and disclosed in Patent Documents 1 to 4.
  • Non-Patent Document 1 The epsilon iron oxide announced by the present inventors in Non-Patent Document 1 is a substance having a huge coercive force of 20 kOe level.
  • a magnetic head having a higher saturation magnetic flux density is used to generate a high magnetic field and write information. Necessary.
  • Patent Documents 1 to 3 the present inventors can reduce the coercive force to a desired value by using epsilon iron oxide in which a part of Fe site is replaced with a different trivalent metal. It was thought that. And as disclosed in Patent Document 4, it became possible to impart thermal stability while ensuring arbitrary adjustability of the coercivity of epsilon iron oxide.
  • the inventors have made the particle size of the epsilon iron oxide smaller to reduce the recording unit (for example, an applied magnetic field of 70 kOe). It was thought that it is important to set the coercive force to 14 kOe or less and to make the particle size of the epsilon iron oxide more uniform. Therefore, the technical problem to be solved by the present invention is epsilon iron oxide having an average particle diameter of 10 to 18 nm, a part of the iron element being substituted with a substitution element, and a coercive force of 14 kOe or less. It is to provide an epsilon iron oxide having a particle size variation coefficient of 40% or less, a method for producing the same, a magnetic paint using the epsilon iron oxide, and a magnetic recording medium.
  • the present inventors conducted research. Then, a metal compound as a substitution element is deposited on iron oxide hydroxide to obtain iron oxide hydroxide to which the metal compound is deposited, and iron oxide hydroxide to which the metal compound is deposited is converted into silicon oxide. And iron oxide hydroxide coated with silicon oxide, and heat treating the iron oxide hydroxide coated with silicon oxide in an oxidizing atmosphere. It is possible to obtain epsilon iron oxide in which a part of the element is replaced with epsilon iron oxide having an average particle diameter of 10 to 18 nm and a coefficient of variation of the particle diameter is 40% or less. As a result, the present invention was completed.
  • the first invention for solving the above-described problem is Applying a metal compound as a substitution element to iron oxide hydroxide to obtain iron oxide hydroxide to which the metal compound is applied; Coating iron oxide hydroxide coated with the metal compound with silicon oxide to obtain iron oxide hydroxide coated with the silicon oxide; Heat-treating the iron oxide hydroxide coated with the silicon oxide in an oxidizing atmosphere, A method for producing epsilon iron oxide, characterized in that epsilon iron oxide in which a part of iron element is substituted with the substitution element is produced.
  • the second invention is A method for producing epsilon iron oxide according to the first invention, comprising: The heat treated powder obtained in the heat treatment step is further treated with an alkaline aqueous solution to produce epsilon iron oxide, which is a method for producing epsilon iron oxide.
  • the third invention is The step of obtaining the iron oxide hydroxide to which the metal compound is deposited, Dissolving a metal salt of the substitution element in the iron oxide hydroxide suspension; Adding an alkaline aqueous solution to a suspension of iron oxide hydroxide in which the metal salt is dissolved to obtain iron oxide hydroxide to which the metal compound is deposited. It is a manufacturing method of the epsilon iron oxide as described in 2 invention.
  • the fourth invention is: The method for producing epsilon iron oxide according to any one of the first to third inventions, wherein the iron oxide hydroxide coated with the metal compound is coated with silicon oxide and then dried to form the silicon oxide.
  • a method for producing epsilon iron oxide characterized by obtaining iron oxide hydroxide coated with a product.
  • the fifth invention is: Epsilon iron oxide in which part of the iron element is substituted with a substitution element, Epsilon iron oxide having an average particle diameter of 10 to 18 nm and a coefficient of variation of the particle diameter of 40% or less.
  • the sixth invention is:
  • the value of the particle volume (1) is not less 500 nm 3 or more, epsilon iron oxide according to the fifth invention, wherein the value of the grain volume (2) is 10000 nm 3 or less.
  • the particle volume (1) is a value obtained by calculating the standard deviation of the particle size distribution of the epsilon iron oxide described in the fifth invention and subtracting the value of the standard deviation from the value of the average particle diameter of the epsilon iron oxide. Is the lower limit of the particle diameter of the epsilon iron oxide, and the volume is obtained by approximating the epsilon iron oxide particles to a spherical shape.
  • the particle volume (2) is obtained by calculating the standard deviation of the particle size distribution of the epsilon iron oxide described in the fifth invention, and adding the value of the standard deviation to the value of the average particle diameter of the epsilon iron oxide. It is a value obtained by considering the epsilon iron oxide particle diameter as an upper limit of the particle size of the epsilon iron oxide particle by approximating the epsilon iron oxide particle into a spherical shape.
  • the seventh invention The value obtained by subtracting the value of the particle volume (1) from the value of the particle volume (2) is 5000 nm 3 or less, and is the epsilon iron oxide according to the sixth invention.
  • the eighth invention A magnetic paint characterized by using the epsilon iron oxide according to any one of the fourth to seventh inventions.
  • the ninth invention A magnetic recording medium using the epsilon iron oxide according to any one of the fourth to seventh inventions.
  • the epsilon iron oxide according to the present invention can have a coercive force of 14 kOe or less, an average particle diameter of 10 to 18 nm, and a coefficient of variation of the particle diameter of 40% or less. Suitable as iron oxide.
  • the epsilon iron oxide according to the present invention is an epsilon iron oxide powder in which part of the iron element is substituted with a substitution element, has an average particle diameter of 10 to 18 nm, and a coefficient of variation of the particle diameter is 40% or less.
  • an epsilon iron oxide powder may be referred to as “epsilon iron oxide” in the present invention.
  • the epsilon iron oxide according to the present invention having the above-described configuration can be maintained (for example, at an applied magnetic field of 70 kOe) by using, for example, a predetermined amount of Ga, Al, Co, Ti or the like alone or as a mixture as the substitution element.
  • the magnetic force can be controlled to 14 kOe or less.
  • the epsilon iron oxide according to the present invention is optimal as an iron oxide for high density recording. Further, when the epsilon iron oxide according to the present invention is used for different applications such as a magnetic shielding film, it is possible to set the required coercive force by controlling the type and amount of the substitution element. .
  • substitution element As the substitution element, it is preferable to use a divalent metal, a tetravalent metal, or a trivalent metal in order to keep the crystal structure of epsilon iron oxide stable. Further, the divalent metal is selected from one or more metal elements selected from Co, Ni, Mn, and Zn, the tetravalent metal is selected from Ti, and the trivalent metal is selected from In, Ga, and Al. One or more metal elements can be cited as preferred examples.
  • the coercive force of the magnetic material can be controlled relatively easily by the amount of element added.
  • the magnetic material can be controlled to a level that can be used even by a known and public magnetic recording head.
  • the average particle diameter is preferably so fine that each particle has a single magnetic domain structure, and the average particle diameter observed with a transmission electron microscope is preferably 18 nm or less.
  • the average particle diameter is preferably 10 nm or more, more preferably 15 nm or more.
  • the substitution element is preferably at least one selected from In, Ga, Al, Co, and Ti.
  • epsilon iron oxide using these different metals as a substitution element tends to easily generate a particle group having a non-uniform particle size distribution as compared with epsilon iron oxide without substitution.
  • the standard deviation of the particle size distribution of the epsilon iron oxide according to the present invention is obtained, and the value obtained by subtracting the value of the standard deviation from the value of the average particle diameter of the epsilon iron oxide is a lower limit of the particle diameter of the epsilon iron oxide.
  • the epsilon iron oxide particles were approximated to a sphere, and the volume of the particles was obtained and defined as the particle volume (1).
  • the value obtained by adding the value of the standard deviation to the value of the average particle diameter of the epsilon iron oxide is considered as the upper limit of the particle diameter of the epsilon iron oxide, and the volume of the particles Was determined as the particle volume (2).
  • the value of the grain volume (1) is 500 nm 3 or more
  • the particle group value of the grain volume (2) satisfies 10000 nm 3 or less
  • the uniformity of the particle size distribution mentioned above is secured, a magnetic recording medium It was conceived that it is suitable as a magnetic particle for use in magnetic shielding films and the like. This means that if the value of the particle volume (1) is 500 nm 3 or more, it will not be affected by thermal fluctuation, and the possibility of becoming a superparamagnetic material will be reduced.
  • the value of the particle volume (2) is 10000 nm 3 or less, it is possible to avoid the situation that the particle volume is too large and causes noise when the magnetic medium is used, and the coercive force becomes excessively high. it is conceivable that.
  • the heteroelement-substituted epsilon oxide according to the present invention is suitable for use as a magnetic powder for the next generation magnetic recording medium because the particle volume distribution is uniform although the particle volume is small. Is. Moreover, since it can be adjusted to a desired coercive force value by adjusting the addition amount of different elements as required, it can also be used as a magnetic shielding film and a magnetic shielding material in a wide range of applications.
  • Iron oxide (III) hydroxide nanoparticles ( ⁇ -FeO (OH)) having an average particle size of 15 nm or less and pure water are mixed, and the iron (Fe) equivalent concentration is 0.01 mol / L or more, 1 mol / L
  • Iron oxide (III) hydroxide nanoparticles ( ⁇ -FeO (OH)) having an average particle size of 15 nm or less and pure water are mixed, and the iron (Fe) equivalent concentration is 0.01 mol / L or more, 1 mol / L
  • a predetermined amount of a water-soluble metal salt solution of a substitution element is added to the dispersion and stirred at 0 to 100 ° C., preferably 20 to 60 ° C.
  • a precipitating agent for example, ammonium sulfate.
  • the cooled dispersion is centrifuged (for example, 3500 rpm, 50 minutes), the supernatant is removed, and the precipitate is washed with pure water. Pure water is added to the precipitate and stirred to obtain a dispersion, which is centrifuged again to remove the supernatant. After the centrifugation and pure water washing are repeated three times or more, the precipitate is collected and dried at about 60 ° C. to obtain a dry powder.
  • the dried powder is heat-treated at 900 ° C. or higher and lower than 1200 ° C., preferably 950 ° C.
  • the obtained heat-treated powder is pulverized and then added to a sodium hydroxide (NaOH) aqueous solution having a liquid temperature of 60 ° C. or higher and 70 ° C. or lower and a concentration of about 5 M, and stirred for 15 hours or longer and 30 hours or shorter Silicon oxide is removed from the heat-treated powder to produce epsilon iron oxide powder partially substituted with iron element.
  • NaOH sodium hydroxide
  • the epsilon iron oxide partially substituted with the produced iron element is recovered by filtration or centrifugation, and the iron element is partially substituted and has an average particle diameter of 10 to 18 nm.
  • An epsilon iron oxide according to the present invention having a particle size variation coefficient of 40% or less could be obtained.
  • the iron oxide hydroxide fine particles described above are not necessarily ⁇ -FeO (OH) fine particles having an average particle diameter of 15 nm or less.
  • the epsilon iron oxide according to the present invention can be obtained.
  • Method of manufacturing magnetic paint In order to use the magnetic powder according to the present invention as a magnetic paint, for example, the following method can be employed. That is, 0.500 g of sample powder (the above-mentioned precipitated powder) is weighed, put in a pot (inner diameter 45 mm, depth 13 mm), and left for 10 minutes with the lid open. Next, vehicle [vinyl chloride resin MR-110 (22 mass%), cyclohexanone (38.7 mass%), acetylacetone (0.3 mass%), n-butyl stearate (0.3 mass%), methyl ethyl ketone (MEK; 38.7% by mass) is collected and added to the pot.
  • vehicle vinyl chloride resin MR-110 (22 mass%), cyclohexanone (38.7 mass%), acetylacetone (0.3 mass%), n-butyl stearate (0.3 mass%), methyl ethyl ketone (MEK; 38.7% by mass
  • Method of manufacturing magnetic recording medium As a method for producing a magnetic recording medium using the magnetic powder according to the present invention, for example, the following method can be employed. After the dispersion process is completed in the above (Magnetic paint manufacturing method), the pot lid is opened, the nylon balls are removed, the prepared paint is put together with the steel balls into an applicator (gap 55 ⁇ m), and applied to the support film. Do. After the coating, the magnetic recording medium using the magnetic powder according to the present invention can be obtained by quickly placing the film at the center of the coil of the aligner having a magnetic flux density of 0.55T, orienting the magnetic field, and then drying. .
  • the method of forming a single magnetic layer is exemplified, but if a known method is employed, a multilayer magnetic recording medium can be formed.
  • Example 1 Manufacture of epsilon iron oxide> A method for producing epsilon iron oxide according to Example 1 will be described with reference to FIGS. 1 and 3 which are flowcharts of the production method and FIG. 2 showing heat treatment conditions. As shown in FIG.
  • TEOS tetraethoxysilane
  • the pulverized powder was loaded into a furnace and heat treated under the heat treatment conditions shown in FIG. 2 in an air atmosphere to obtain heat treated powder.
  • the obtained heat-treated powder was charged into a 250 mL Erlenmeyer flask and stirred with 140 ml of 5 mol / L sodium hydroxide (NaOH) aqueous solution at a liquid temperature of 70 ° C. for 24 hours. Silicon oxide was removed. Next, the heat-treated powder from which the silicon oxide was removed was centrifuged (5000 rpm, 10 minutes), the supernatant was removed, and the precipitate was collected. The collected precipitate was washed with about 35 ml of pure water, centrifuged again (10000 rpm, 5 minutes), the supernatant was removed, and the precipitate was collected. The collected precipitate was washed with about 35 ml of pure water, centrifuged (14000 rpm, 60 minutes), and the process of removing the supernatant was repeated twice to obtain epsilon iron oxide according to Example 1.
  • NaOH sodium hydroxide
  • Table 1 shows the results of elemental analysis of the obtained epsilon iron oxide according to Example 1 using a high frequency induction plasma emission spectrometer ICP (Agilent 7700x) manufactured by Agilent Technologies. Moreover, when the epsilon iron oxide which concerns on Example 1 was observed with the transmission electron microscope (TEM) and the average particle diameter was calculated
  • TEM transmission electron microscope
  • the average particle diameter, standard deviation, coefficient of variation, average particle volume, particle volume (1), particle volume (2), particle volume [(2)-(1)] of the obtained epsilon iron oxide according to Example 1 Values are shown in Table 1. Furthermore, the magnetic properties (coercivity, saturation magnetization, residual magnetization) of the epsilon iron oxide according to Example 1 were measured. Specifically, using a SQUID (superconducting quantum interferometer) of MPMS7 manufactured by Quantum Design, measurement was performed at a maximum applied magnetic field of 70 kOe and a temperature of 300K. Table 1 shows values of the obtained coercive force, saturation magnetization, and residual magnetization.
  • Example 2 In a 1 L Erlenmeyer flask, 420 g of pure water and 7.2 g of a sol of iron oxide (III) nanoparticle ( ⁇ -FeO (OH)) having an average particle size of about 6 nm, Ga (NO 3 ) 3 .nH 2 O powder was carried out in the same manner as in Example 1, except that 200.74 mg of Co, (NO 3 ) 2 .6H 2 O powder, 72.93 mg, and 0.05 ml of TiCl 4 solution having a Ti equivalent concentration of 16 wt% were added. The epsilon iron oxide according to Example 2 was obtained.
  • Example 3 In 1L Erlenmeyer flask, sol 7.6g, Co (NO 3) 2 ⁇ 6H 2 O powder of pure water 420mL and average particle size of about 6nm oxide iron (III) hydroxide nanoparticles ( ⁇ -FeO (OH)) was obtained in the same manner as in Example 1 except that 0.05 ml of a TiCl 4 solution having a Ti equivalent concentration of 16 wt% was added to obtain epsilon iron oxide according to Example 3.
  • the average particle size, standard deviation, coefficient of variation, average particle volume, average particle volume, particle volume (1), particle volume Table 1 shows the values of (2), particle volume [(2)-(1)], coercive force, saturation magnetization, and residual magnetization.
  • Example 4 In a 1 L Erlenmeyer flask, 420 mL of pure water and sol of iron oxide (III) oxide nanoparticles ( ⁇ -FeO (OH)) having an average particle diameter of about 6 nm, 7.6 g, Ga (NO 3 ) 3 .nH 2 O powder The epsilon iron oxide according to Example 4 was obtained in the same manner as in Example 1 except that 201.21 mg was added.
  • iron oxide (III) oxide nanoparticles ⁇ -FeO (OH)
  • the average particle size, standard deviation, coefficient of variation, average particle volume, average particle volume, particle volume (1), particle volume Table 1 shows the values of (2), particle volume [(2)-(1)], coercive force, saturation magnetization, and residual magnetization.
  • Example 5 In a 1 L Erlenmeyer flask, 420 mL of pure water and sol of iron oxide (III) oxide nanoparticles ( ⁇ -FeO (OH)) having an average particle size of about 6 nm, 6.6 g, Ga (NO 3 ) 3 .nH 2 O powder The epsilon iron oxide according to Example 5 was obtained in the same manner as in Example 1 except that 701.05 mg was added.
  • iron oxide (III) oxide nanoparticles ⁇ -FeO (OH)
  • Example 6 In 1L Erlenmeyer flask, sol 6.6g of pure water 420mL and average particle size of about 6nm oxide iron (III) hydroxide nanoparticles ( ⁇ -FeO (OH)) , the Al (NO 3) 3 ⁇ 9H 2 O compound Epsilon iron oxide according to Example 6 was obtained in the same manner as in Example 1 except that 656.53 mg was added.
  • the average particle size, standard deviation, coefficient of variation, average particle volume, average particle volume, particle volume (1), particle volume Table 1 shows the values of (2), particle volume [(2)-(1)], coercive force, saturation magnetization, and residual magnetization.
  • Comparative Example 2 In the procedure 1, 24.3 mL of pure water is put into a Teflon (registered trademark) flask. There, iron nitrate (III) 9 hydrate, gallium nitrate (III) n hydrate, cobalt nitrate (II) hexahydrate, and titanium sulfate (IV) n hydrate are produced. A comparison was made by operating in the same manner as in Comparative Example 1 except that the composition of the epsilon iron oxide according to Comparative Example 2 was added so that the composition was Fe 1.79 Ga 0.10 Co 0.05 Ti 0.06 O 3. The epsilon iron oxide according to Example 2 was obtained.
  • a solution B is obtained by adding 2.0 mL of 25% aqueous ammonia to 22.3 mL of pure water and stirring.
  • the neutralizer solution B is added dropwise. After completion of the dropwise addition, the resulting mixture is continuously stirred for 30 minutes.
  • the mixed solution obtained in the procedure 2 0.49 mL of tetraethoxysilane is added to the mixed solution. And stirring is continued for about one day after the said addition.
  • the mixed solution obtained in the procedure 3 is filtered, and the precipitate is collected and washed with pure water.
  • Example 4 Example 1 except that 420 mL of pure water and only 8.0 g of a sol of iron oxide (III) oxide nanoparticles ( ⁇ -FeO (OH)) having an average particle diameter of about 6 nm were placed in a 1 L Erlenmeyer flask. The same operation was performed to obtain epsilon iron oxide according to Comparative Example 4. As a result of elemental analysis using ICP in the obtained epsilon iron oxide according to Comparative Example 4, the average particle size, standard deviation, coefficient of variation, average particle volume, average particle volume, average particle volume, particle volume (1 ), Particle volume (2), particle volume [(2)-(1)], coercive force, saturation magnetization, and residual magnetization are shown in Table 1.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Compounds Of Iron (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)

Abstract

L'invention concerne : un oxyde de fer epsilon qui a une taille moyenne de particule de 10 à 18 nm, dans lequel une partie d'un élément fer est substituée par un élément de substitution, et qui a une force coercitive de 14 kOe ou moins, le coefficient de variation de la taille de particule étant de 40 % ou moins ; et un procédé de production de ce dernier. Ce procédé de production de l'oxyde de fer epsilon comprend : une étape consistant à appliquer un métal qui est l'élément de substitution à l'oxyde-hydroxyde de fer pour obtenir un oxyde-hydroxyde de fer auquel le métal est appliqué ; une étape de revêtement de l'oxyde-hydroxyde de fer auquel le métal est appliqué avec de l'oxyde de silicium pour obtenir un oxyde-hydroxyde de fer revêtu d'oxyde de silicium ; et une étape de traitement thermique de l'oxyde-hydroxyde de fer revêtu d'oxyde de silicium sous une atmosphère oxydante. Le procédé est caractérisé par la production d'un oxyde de fer epsilon dans lequel une partie de l'élément fer est substitué par l'élément de substitution.
PCT/JP2016/067554 2015-06-12 2016-06-13 Oxyde de fer epsilon et procédé de production associé, peinture magnétique, et support d'enregistrement magnétique WO2016199937A1 (fr)

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US15/735,410 US10807880B2 (en) 2015-06-12 2016-06-13 Epsilon iron oxide and method for producing the same, magnetic coating material and magnetic recording medium
EP16807640.4A EP3309128A4 (fr) 2015-06-12 2016-06-13 Oxyde de fer epsilon et procédé de production associé, peinture magnétique, et support d'enregistrement magnétique
CN201680030678.1A CN107635924B (zh) 2015-06-12 2016-06-13 ε氧化铁及其制造方法、磁性涂料和磁记录介质

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JP2016116784A JP6821335B2 (ja) 2015-06-12 2016-06-13 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
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JP2018108919A (ja) * 2017-01-05 2018-07-12 富士フイルム株式会社 ε−酸化鉄型強磁性粉末
US11401170B2 (en) * 2018-03-29 2022-08-02 Dowa Electronics Materials Co., Ltd. Iron based oxide magnetic powder and method for producing same

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US11401170B2 (en) * 2018-03-29 2022-08-02 Dowa Electronics Materials Co., Ltd. Iron based oxide magnetic powder and method for producing same

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