WO2020171175A1 - FeNi ORDERED ALLOY, METHOD FOR PRODUCING FeNi ORDERED ALLOY, AND MAGNETIC MATERIAL CONTAINING FeNi ORDERED ALLOY - Google Patents

Abstract

The present invention has a structure wherein the periphery of a particle (10) that has an L10 ordered structure is covered by an insulating cover (12, 13) that is composed of an insulating body.

Description

FeNi ordered alloy, method for producing FeNi ordered alloy, and magnetic material containing FeNi ordered alloy Cross-reference to related application

This application is based on Japanese Patent Application No. 2019-30741 filed on February 22, 2019, the description of which is incorporated herein by reference.

The present disclosure discloses an L1 ₀ type FeNi (iron-nickel) ordered alloy having an L1 ₀ type (erwan _zero type) ordered structure, and a method for producing such an L1 ₀ type FeNi ordered alloy, and further L1 _0. Type FeNi ordered alloy.

L1 ₀ type FeNi ordered alloy is expected as a magnet material and magnetic recording material uses no rare earth and precious metals. Such L1 ₀ type FeNi ordered alloy, there is disclosed in Patent Document 1. In Patent Document 1, after performing a nitriding treatment for nitriding a powder sample of a FeNi disordered alloy, a denitrification treatment for removing nitrogen from the nitrided FeNi disordered alloy is performed to obtain L1 having a high degree of order S1. _{A 0-} type FeNi ordered alloy is obtained.

Japanese Patent Laid-Open No. 2018-109238

However, in the method described in Patent Document 1, since it is a state in which the surface of the particles of the L1 ₀ type FeNi ordered alloy obtained is exposed, it will be described in the following (1) to (4) issues Was found to occur.

(1) The L1 ₀ type FeNi ordered alloy is used as a magnetic material such as a magnet, for example, and magnetic interaction is caused by contact of magnetic powder particles composed of particles of the L1 ₀ type FeNi ordered alloy. .. This interaction causes a problem that the coercive force is reduced and the magnet characteristics are deteriorated.

(2) In magnetic powder particles with high electric conductivity, when an electric conduction path is formed due to contact between magnetic powder particles, it causes an eddy current and causes a problem that characteristics of the magnet deteriorate.

(3) When particles of an L1 ₀ type FeNi ordered alloy are used as magnetic powder and the magnetic powder is hardened with a composite material such as a resin to form a bonded magnet, the surface of the magnetic powder can be suppressed so that separation of the magnetic powder and the composite material can be suppressed. Is required to have a good wettability with respect to the composite material. For this reason, a surface treatment is performed to obtain such a surface state, but it is difficult to directly perform the surface treatment on the exposed surface of the particles of the FeNi disordered alloy.

(4) In order to expand the usage environment of the magnet, it is desirable that the magnet surface has high weather resistance and high chemical stability against corrosive gas such as water, salt and acid. but the chemical stability of the L1 ₀ type FeNi ordered alloy is not high.
The present disclosure, it is possible to suppress the deterioration of magnetic properties, also good wettability to the composite material as was applied to the bonded magnet, and, L1 ₀ type FeNi ordered alloy having excellent chemical stability, its preparation Methods and magnetic materials comprising FeNi ordered alloys.

FeNi ordered alloy in one aspect of the present disclosure, have a particle of L1 ₀ type ordered structure surrounding said particles are coated with an insulating coating.

Thus, and with the surrounding particles of L1 ₀ type ordered structure is covered with an insulating coating structure. As a result, it is possible to obtain a FeNi ordered alloy that can suppress deterioration of magnet characteristics, has good wettability to a composite material even when applied to a bonded magnet, and has excellent chemical stability.

In addition, another method of manufacturing an FeNi ordered alloy according to another aspect of the present disclosure is to prepare powder of an FeNi ordered alloy and perform an insulating coating forming process of covering the periphery of the particles of the FeNi ordered alloy powder with an insulating coating. To obtain an L1 ₀ type FeNi ordered alloy in which the particles are covered with an insulating coating. Further, a method of manufacturing an FeNi ordered alloy according to still another aspect of the present disclosure includes performing an insulating coating forming process of covering the periphery of particles of a powder of an FeNi disordered alloy with an insulating coating, and Densification of the powder particles by heat treatment and nitriding treatment of nitriding the densified FeNi disordered alloy particles, and then removing nitrogen from the nitrided FeNi disordered alloy particles by performing the denitrification, and includes a to obtain particles of L1 ₀ type FeNi ordered alloy ambient is covered with an insulating coating, the.

By these production methods, it is possible to produce an L1 ₀ type FeNi ordered alloy having particles having an L1 ₀ type ordered structure and the periphery of the particles being covered with an insulating coating.

Note that the reference numerals in parentheses attached to the respective constituent elements and the like indicate an example of a correspondence relationship between the constituent elements and the like and concrete constituent elements and the like described in the embodiments described later.

It is a sectional view showing a state of particles of a FeNi regular alloy explained in a 1st embodiment. 2 is a flowchart showing a manufacturing process of the FeNi ordered alloy shown in FIG. 1. 3 is a table showing a list of solvents used for forming an insulating coating, a material source of the insulating coating, and types of additives. It is sectional drawing which showed the mode of the particle|grains of the FeNi regular alloy demonstrated in 2nd Embodiment. It is a flow chart showing a manufacturing process of a FeNi regular alloy explained in a 3rd embodiment. It is sectional drawing which showed the particle|grain cross-section structure corresponding to each process of FIG.

Hereinafter, an embodiment of the present disclosure will be described based on the drawings. In each of the following embodiments, the same or equivalent portions will be denoted by the same reference numerals for description.

(First embodiment)
The first embodiment will be described. The L1 ₀ type FeNi ordered alloy according to this embodiment, that is, the FeNi superlattice, is applied to magnetic materials such as magnet materials and magnetic recording materials.

The L1 ₀ type ordered structure is composed of a lattice structure based on a face-centered cubic lattice. Then, an infinite number of FeNi ordered alloy particles 10 having an L1 ₀ type ordered structure as shown in FIG. 1 are collected and applied to a magnetic material.

The particle 10 has a particle size of about 200 to 500 nm and an average particle size of about 250 nm. Although the crystal structure of each particle 10 is arbitrary, it is preferable that each particle 10 is composed of a single crystal and is composed of a single magnetic domain. Even if it is composed of a plurality of magnetic domains, the composition is as small as possible. It is good to have been. If the particle size of the particles 10 is less than 200 nm, the coercive force is transmitted due to the effect of thermal fluctuation, and the magnet characteristics deteriorate. Further, if the particle size of the particles 10 exceeds 500 nm, it is difficult to form a single magnetic domain, and multiple domains are formed. When the magnetic domain is made multi-domain, the magnetization reversal occurs due to the domain wall movement, so that the coercive force is reduced and the magnet characteristics are deteriorated as in the above case. Therefore, the particle size of the particles 10 is set to about 200 to 500 nm.

An insulating film 12 corresponding to an insulating coating is formed on the surface of the particles 10. As the material for forming the insulating film 12, for example, silica, titania, zirconia, yttria, alumina, or other oxides of Group III to VII or XIII to XVI elements can be used, and other insulating materials such as nitride films You may use the film comprised by. Although the thickness of the insulating film 12 is arbitrary, it is preferably 1 nm or more in order to obtain a sufficient insulating property, and is, for example, 10 to 20 nm. Further, when the insulating film 12 is too thick, the volume density of the FeNi ordered alloy in the particles 10 and the insulating film 12 of the L1 ₀ type FeNi ordered alloy is reduced. For this reason, the magnetic characteristics per weight or volume of the FeNi ordered alloy powder covering the surface of the particles 10 with the insulating film 12 are reduced, so that the film thickness of the insulating film 12 is increased so as to obtain the required magnetic characteristics. The upper limit of should be set. Preferably, L1 ₀ type FeNi ordered alloy particles 10 and the insulating film 12 the volume density of the FeNi ordered alloy is 80% or more in the, i.e. the volume density of the insulating film 12 may be such that more than 20%.

By forming such an insulating film 12, the surface state of the particles 10 can be brought into a state capable of solving the above-mentioned problems (1) to (4). This will be described below.

First, because it is an insulating film 12 is a non-magnetic form on the surface of the particle 10, the case of using an L1 ₀ type FeNi ordered alloy of the present embodiment as a magnetic material such as a magnet, the magnetic powder composed of particles 10 Direct contact between particles is suppressed. For this reason, it is possible to suppress the magnetic interaction due to the contact of the magnetic powder particles, so that it is possible to improve the magnet characteristics. This makes it possible to solve the problem (1).

Moreover, the particles 10 of the FeNi ordered alloy as in the present embodiment are magnetic powder particles having high electric conductivity. Therefore, if an electric conduction path is formed by the contact between the magnetic powder particles composed of the particles 10, it will cause generation of an eddy current, leading to deterioration in characteristics as a magnet. Contact between them is suppressed. Therefore, the problem (2) can be solved.

Next, using particles 10 of L1 ₀ type FeNi ordered alloy as a magnetic powder, if solidify the magnetic powder in the composite material such as a resin forming the bonded magnet, so that it can suppress the separation of the magnetic powder and the composite material, the magnetic powder The surface is required to have a good wettability with respect to the composite material. Therefore, in the state where the surface of the particle 10 is covered with the insulating film 12 as in the present embodiment, the insulating film 12 may have a good wettability to the composite material. On the other hand, the insulating film 12 composed of oxides of III-VII group and XIII-XVI group elements has a surface state having a large number of hydroxyl groups and is in a chemical state that is easily chemically modified. There is. Therefore, the insulating film 12 has better wettability with a commonly used composite material such as polyamide or phenol resin than the FeNi disordered alloy. Therefore, it is possible to solve the problem of (3) without performing the step of directly surface-treating the exposed surface of the particles 10 of the FeNi disordered alloy.

Further, in order to expand the use environment of the magnet, it is desirable that the magnet surface has high weather resistance and high chemical stability against corrosive gas such as water, salt and acid. , chemical stability of L1 ₀ type FeNi ordered alloy is not high. On the other hand, when the surface of the particle 10 is covered with the insulating film 12 having high weather resistance and high chemical stability as in the present embodiment, the insulating film 12 causes the particle 10 itself to have water or salt content, and further, a corrosion resistant gas. It is possible to suppress the contact with, and as a result, it is possible to enhance the chemical stability of the particles 10. Therefore, the problem (4) can be solved.

As described above, the particles 10 are covered with the insulating film 12 which is non-magnetic, has an insulating property, is easily chemically modified, and has high chemical stability. As a result, it is possible to suppress the deterioration of the magnetic properties, and even if it is applied to a bonded magnet, it is possible to obtain a FeNi disordered alloy which has good wettability with respect to the composite material and excellent chemical stability. Therefore, it becomes an FeNi ordered alloy having an L1 ₀ type ordered structure with good magnet characteristics and can be used as a magnetic material with good magnet characteristics.

That is, such L1 ₀ ordered structure FeNi rules particles 10 innumerable gathered alloy, or by sintering, with or solidified by molding mixed with composite material such as a resin when producing the magnet, and more The magnet body can have strong magnetic properties.

Such L1 ₀ type FeNi ordered alloy, for example, after the nitriding process of nitriding the FeNi disordered alloy performs denitrification process for removing nitrogen from nitriding treated FeNi disordered alloy, further particles It is obtained by covering the periphery of 10 with the insulating film 12.

Hereinafter, a method for producing the L1 ₀ type FeNi ordered alloy will be described with reference to a flowchart showing the manufacturing process shown in FIG.

First, as shown in step S100 of FIG. 2, is prepared a powder of FeNi ordered alloy L1 ₀ ordered structure. The L1 ₀ ordered structure FeNi ordered alloy can be produced using a known method such as shown in Patent Document 1.

For example, first, a powder of FeNi disordered alloy is prepared by a thermal plasma method, a flame spraying method, a coprecipitation method, or the like. The FeNi for powder particles irregularly alloys're finally turned to a particle size of about 200 ~ 500 nm similarly to the L1 ₀ type FeNi ordered alloy to be obtained is preferable.

Next, a nitriding denitrification process is performed. This nitriding and denitrifying method can be performed by using a nitriding and denitrifying apparatus as disclosed in, for example, Patent Document 1 described above. Although not shown, the nitriding denitrification treatment apparatus includes a tubular furnace as a heating furnace that is heated by a heater, and a glove box for installing a sample in the tubular furnace. Further, the nitriding denitrification treatment device is equipped with a gas introduction part for switching Ar (argon) as a purge gas, NH ₃ for nitriding treatment, and H ₂ (hydrogen) for denitrification treatment into the tubular furnace. ing. Using such a nitriding denitrification processing apparatus, nitriding denitrification processing is performed as follows.

First, a sample of prepared FeNi disordered alloy powder is placed in a tubular furnace. Then, nitriding treatment is performed. In this nitriding treatment, NH ₃ gas is introduced into the tubular furnace to create an NH ₃ atmosphere in the tubular furnace, and the FeNi disordered alloy is heated and nitrided at a predetermined temperature for a predetermined time. At this time, N is incorporated into FeNi by the nitriding treatment, so that crystal ordering occurs. Preferably, when FeNiN, which is a FeNi compound, is generated, it is possible to obtain the structure of the metallic element arrangement of the FeNi ordered alloy at the stage of the nitriding treatment.

After that, denitrification treatment is performed. In the denitrification treatment, H ₂ gas is introduced into a heating furnace to create an H ₂ atmosphere in the tubular furnace, and the nitrided FeNi disordered alloy is heated at a predetermined temperature for a predetermined time to remove nitrogen. By removing this way nitrogen, powder L1 ₀ type FeNi ordered alloy is obtained. Then, in steps S110 to S140, an insulating coating formation process is performed.

In step S110, performs a coating process for coating an insulating film 12 around the particles 10 of the powder of L1 ₀ type FeNi ordered alloy as an insulating coating. As the insulating film 12, as described above, for example, an oxide film of silica, titania, zirconia, yttria, alumina or the like can be used, and a film made of an insulating material such as a nitride film may be used. .. Regarding the constituent material and formation of the insulating film 12, for example, the combination of the solvent, the material source of the insulating coating and the additive shown in FIG. 3 may be applied.

Specifically, when the insulating film 12 is made of silica, FeNi ordered alloy powder is mixed with a solvent of water or ethanol to which tetraethoxysilane, which is a material source of the insulating coating, is added, and further mixed with an additive. Aqueous ammonia (NH ₃ ) aqueous solution is poured in. As a result, tetraethoxysilane reacts with NH ₃ to generate silica, and the periphery of the particles 10 of the FeNi ordered alloy powder is coated with silica having a thickness of 10 to 20 nm, for example. In this way, the insulating film 12 can be formed around the particles 10.

Also, the FeNi ordered alloy powder is mixed with water that is a solvent, to which sodium silicate that is a material source of the insulating coating is added, and hydrochloric acid (HCl) that is an additive is poured. As a result, sodium silicate and HCl react with each other to generate silica, and the periphery of the FeNi ordered alloy powder particles 10 is coated with silica having a thickness of, for example, 10 to 20 nm. Even in this case, the insulating film 12 can be formed around the particles 10.

Similarly, when the insulating film 12 is composed of titania, ethanol can be used as a solvent, titanium tetraisopropoxide as a material source of the insulating coating, and NH ₃ as an additive. When the insulating film 12 is made of alumina, water can be used as a solvent, aluminum nitrate hexahydrate as a material source of the insulating coating, and NH ₃ as an additive. When the insulating film 12 is made of zirconia, it is possible to use water or ethanol as a solvent, zirconium ethoxide as a material source of the insulating coating, and NH ₃ as an additive. When the insulating film 12 is made of yttria, water can be used as a solvent, yttrium chloride hexahydrate as a material source of the insulating coating, and sodium hydroxide as an additive.

In addition, also in the case of forming the insulating film 12 by using other materials, a general method known as a production method is applied, and FeNi ordered alloy powder is mixed at the time of the production to form various materials. The insulating film 12 composed of is formed.

After that, a cleaning process is performed in step S120. In the cleaning process, when the insulating film 12 is formed to cover the FeNi ordered alloy particles 10, the unnecessary coating material formed at the same time is removed. Here, after the reaction for forming the insulating film 12 is performed by centrifugation to collect the solid content, the solvent at the time of the reaction is added to the solid content, the mixture is stirred, and then the solid content is recovered by centrifugation again. The unnecessary coating material is removed by repeating the above process a plurality of times. As a result, only the FeNi ordered alloy particles 10 covered with the insulating film 12 are selected.

Subsequently, a firing process is performed in step S130. For example, the FeNi ordered alloy in which the particles 10 are covered with the insulating film 12 is heated at a predetermined temperature for a predetermined time, whereby the insulating film 12 is fired. When the particles 10 are simply covered with the insulating film 12, the crystallinity of the insulating film 12 may not be good. For example, when it is desired to form the insulating film 12 with an oxide, the coating of the particles 10 may be present in a hydroxide state only by the coating process of step S110, and this is converted into an oxide by firing. Then, the insulating film 12 is made to have a more preferable crystal structure.

After that, a non-defective product and a defective product are selected by performing an evaluation process in step S140. For example, whether the insulating film 12 evenly covers the particles 10 or whether the insulating film 12 has good film thickness and crystallinity is evaluated by a quality evaluation by a scanning electron microscope (SEM) or X-ray diffraction (XRD). Then, the material evaluated to be good is used as the magnetic material. In this way, the insulating coating forming process is completed.

As described above, it is possible to manufacture the L1 ₀ type FeNi ordered alloy of the present embodiment. Particles 10 of such and L1 ₀ type FeNi ordered alloy, prepared is a non-magnetic, an insulating, in an easy chemical state chemically modified, and are covered by the high dielectric film 12 is also chemical stability .. For this reason, it is possible to suppress the deterioration of the magnetic properties, and it is possible to obtain a FeNi disordered alloy having good wettability to the composite material and excellent chemical stability even when applied to a bonded magnet. Therefore, it becomes an FeNi ordered alloy having an L1 ₀ type ordered structure with good magnet characteristics and can be used as a magnetic material with good magnet characteristics.

(Second embodiment)
The second embodiment will be described. In the present embodiment, the configuration of the insulating coating is changed from that of the first embodiment, and the other points are the same as those of the first embodiment, so only the portions different from the first embodiment will be described.

In the first embodiment described above, the insulating film 12 is used as an example of the insulating coating, but in the present embodiment, a powdery material is used.

As shown in FIG. 4, in the present embodiment, in a state of surrounding the particles 10 of FeNi ordered alloy L1 ₀ ordered structure is covered by an insulator 13 of powdery substance made of an insulating coating. The particles 10 may be covered with the insulator 13 composed of such a powdery material. In that case, the entire area around the particle 10 cannot be completely covered by the insulator 13, and the weather resistance and the chemical stability of the portion of the particle 10 exposed from the insulator 13 may be reduced. However, since it is covered with the insulator 13 over a wide area around the particle 10 even if it is not over the entire area, weather resistance and chemical stability are also improved as compared with the case where the particles are not covered with the insulator 13. It becomes possible.

In order to cover the particles 10 with the insulator 13 composed of a powdery material in this way, the following processing may be performed as the coating processing in the insulating coating forming processing.

For example, the FeNi ordered alloy powder prepared in step S100 of FIG. 3 described in the first embodiment is mixed into a solution in which a powder of an insulating coating material is mixed with a solvent. Thereby, the periphery of the particles 10 can be covered with the insulator 13. Further, even if the powder of the insulating coating material is not mixed with the solvent, the powder of the FeNi ordered alloy may be directly sprinkled with the powder of the insulating coating material to cover the particles 10 with the insulator 13. ..

Thereafter, each remaining processing of the insulating coating-forming process, i.e. the washing process in step S120 in FIG. 3, the firing process in the step S130, through the evaluation process in step S140, FeNi of L1 ₀ ordered structure according to this embodiment An ordered alloy can be obtained.

(Third Embodiment)
A third embodiment will be described. In the present embodiment, the manufacturing method of the FeNi ordered alloy is changed from the first and second embodiments, and the other points are the same as those in the first and second embodiments. Only parts different from the form will be described. Note that here, the case where the present embodiment is applied to the case where the insulating film 12 is applied as in the first embodiment will be described as an example, but the insulator 13 formed of a powdery material as in the second embodiment will be described. The present embodiment can be applied when applied.

In the present embodiment, the insulating film 12 is formed at the stage of the FeNi disordered alloy used to manufacture the FeNi ordered alloy, and the FeNi disordered alloy is manufactured from there. A method of manufacturing such a FeNi disordered alloy will be described with reference to a flowchart showing the manufacturing process shown in FIG. 5 and a diagram showing a particle cross-sectional structure corresponding to each process of FIG. 5 shown in FIG. Although FIG. 6 shows the particle cross-sectional structure, hatching is not partly shown in order to make the crystal structure easy to see.

First, in step S200 of FIG. 5, as described in step S100 of FIG. 3 above, FeNi disordered alloy powder is prepared by a known method. As a result, the particles 20 of the FeNi disordered alloy powder having the state shown in the state (a) of FIG. 6 can be obtained. The particles 20 are polycrystalline, and many grain boundaries are present in the crystals. The particle size of the particles 20, what is ultimately similar to the L1 ₀ type FeNi ordered alloy to be obtained becomes to a particle size of about 200 ~ 500 nm is preferred. However, since the particle size may change due to densification or the like due to the heat treatment described later, the particle size does not necessarily have to be 200 to 500 nm.

Next, as shown in step S210, an insulation coating forming process is performed. Specifically, as the insulating coating formation process, each process of steps S110 to S140 of FIG. 3 described in the first embodiment is sequentially performed. Thereby, as shown in the state (b) of FIG. 6, the periphery of the particles 20 can be covered with the insulating film 12.

Subsequently, as shown in step S220, heat treatment is performed. For example, heat treatment is performed for 1 hour at a temperature of 200 to 800° C. using hydrogen as an atmosphere gas. At this time, in step S210 described above, each particle 20 is covered with the insulating film 12. Therefore, even if the heat treatment is performed, the adjacent particles 20 can be isolated from each other, and as shown in the state (c) of FIG. 6, the insulating film 12 is densified and has a crystal structure with few grain boundaries. It is possible to obtain the particles 20 of the FeNi disordered alloy which are preferably single crystals. The "isolated state" here means that the particles 20 are not stuck and integrated with each other, and are physically independent and can be separated from each other. ..

Thereafter, as shown in step S230, nitriding denitrification treatment is performed. This nitriding denitrification method may be performed by the same method as step S110 of FIG. 3 described in the first embodiment. In this way, by performing the nitriding denitrification, powder L1 ₀ type FeNi ordered alloy is obtained. That is, FeNi disordered alloy particles 20 covered with insulating film 12, the nitride denitrification treatment, as shown in the state of FIG. 6 (d), L1 ₀ type FeNi ordered alloy of the structure shown in FIG. 1 That is, it becomes the particles 10 of the FeNi superlattice. Further, since it is nitrided denitrification to the particle 20 of FeNi disordered alloy of isolated state, for the particles 10 of L1 ₀ type FeNi ordered alloy, and a state between particles 10 adjacent isolated Become.

As described above, since covering the particles 20 of FeNi disordered alloy with an insulating film 12, so as to perform the nitriding denitrification may produce L1 ₀ type FeNi ordered alloy. Even in this case, the same effect as that of the first embodiment can be obtained. Furthermore, since the FeNi disordered alloy is densified by the heat treatment and then the nitriding denitrification treatment is performed, it is possible to reduce the volume fraction of the pores contained in the finished FeNi ordered alloy. It is possible to improve the magnet characteristics.

(Other embodiments)
Although the present disclosure has been described based on the above-described embodiment, the present disclosure is not limited to the embodiment and includes various modifications and modifications within the equivalent range. In addition, various combinations and forms, and other combinations and forms including only one element, more, or less than them are also within the scope and spirit of the present disclosure.

For example, in each of the above-described embodiments, an example of conditions for nitriding treatment, denitrifying treatment, coating forming treatment, and heat treatment has been described. However, what has been described here is merely an example of each condition.

Further, L1 ₀ type FeNi ordered alloy according to the embodiment is applied to a magnetic material such as magnetic materials and magnetic recording materials, the scope of the FeNi ordered alloy is not limited to a magnetic material ..

Claims (8)

1. L1 ₀ type have a particle ordered structure (10) of, FeNi ordered alloy surrounding said particles are coated with an insulating coating (12, 13).
2. The FeNi ordered alloy according to claim 1, wherein the insulating coating is an insulating film (12).
3. The FeNi ordered alloy according to claim 1, wherein the insulating coating is a powdery insulator (13).
4. The FeNi ordered alloy according to any one of claims 1 to 3, wherein the insulating coating is an oxide of a group III-VII group or a group XIII-XVI element.
5. A magnetic material comprising the FeNi ordered alloy according to any one of claims 1 to 4.
6. A method of manufacturing a FeNi ordered alloy having an L1 ₀ type ordered structure,
   Preparing FeNi ordered alloy powder,
   An L1 ₀ type FeNi in which the particles are covered with the insulating coating is formed by performing an insulating coating forming process in which the particles of the FeNi ordered alloy powder (10) are covered with an insulating coating (12, 13). A method for producing an FeNi ordered alloy, comprising: obtaining an ordered alloy.
7. As the insulating coating forming treatment, an additive that mixes the powder of the FeNi ordered alloy in a solvent to which the material source of the insulating coating is added, and further reacts with the material source to form the insulating coating. The method for producing an FeNi ordered alloy according to claim 6, wherein the particles are covered with the insulating coating by adding.
8. A method of manufacturing a FeNi ordered alloy having an L1 ₀ type ordered structure,
   Performing an insulating coating forming process of covering the periphery of the powder particles (20) of the FeNi disordered alloy with the insulating coating (12, 13);
   Densifying particles of the powder of the FeNi disordered alloy by heat treatment;
   After performing a nitriding treatment for nitriding the densified particles of the FeNi disordered alloy, a denitrification treatment for removing nitrogen from the nitrided particles of the FeNi disordered alloy is performed to There manufacturing method of FeNi ordered alloy comprising, a to obtain particles (10) of the L1 ₀ type FeNi ordered alloy covered with the insulating coating.

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