JP2003073786A - Rare-earths magnetic alloy with refined crystal, and rare-earths bond magnet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rare-earths magnetic alloy powder superior in coercive force and high residual magnetic flux density, in which micro-crystallites consisting of a hard magnetic body are precipitated, and provide a rare-earths bond magnet superior in magnetic properties manufactured with the use of the magnetic powder. SOLUTION: The rare-earths magnetic alloy 10 with refined crystallites, having great coercive forcei Hc , residual magnetic flux density Br , and maximum energy product (BH)Max , is obtained by means of precipitating a microcrystalline phase (a main phase 11) consisting of a soft magnetic material, which has an average length of a longer axis of the crystals of 30 nm or longer but shorter than 100 nm, and the shortest distance between the crystals of 10 nm or longer but shorter than 50 nm, in metal or a metal compound (a secondary phase 12) of non-crystalline or crystalline form, consisting of a hard magnetic body of the amorphous rare-earths alloy containing iron as a main component. The rare-earths bond magnet with a high magnetic force is obtained by means of molding the resin magnet composition, in which a fine powder of such a rare-earths magnetic alloy with fine crystallites is mixed with and dispersed in a resin binder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rare earth magnetic alloy and a rare earth bonded magnet, and more particularly to a fine crystallized rare earth magnetic alloy in which a fine crystalline phase made of a hard magnetic material is precipitated in the rare earth magnetic alloy, The present invention relates to a rare earth bonded magnet using a finely crystallized rare earth magnetic alloy.

[0002]

2. Description of the Related Art A magnet roller used in a copying machine or a magnet for a motor is manufactured by dispersing powder of a ferrite-based magnetic oxide such as Ba ferrite or St ferrite or a rare earth-based magnetic alloy in a binder. A bond magnet obtained by molding a resin magnet composition using a mold is widely used. Such bonded magnets are highly flexible,
It has the advantage that it can be handled like rubber and plastic and is easy to process. Among them, SmCo and NdFe
A rare earth bonded magnet such as B has a maximum energy product (B
H) Due to its large _{Max, it} is currently attracting attention as a small high magnetic force magnet material such as a magnet for a motor.

As a method for producing an alloy powder as a material of the above-mentioned rare earth bonded magnet, for example, a rare earth metal such as Nd and Sm and a transition metal such as Fe and Co and other metals such as B are melted in a crucible. And alloyed, by injecting a high-pressure inert gas from the upper portion of this molten alloy, jetting the molten metal from a nozzle opening provided in the lower portion of the crucible,
By the melt-span method in which the jetted molten alloy is collided with the side surface of a rotating disk and rapidly cooled, the thickness is several μm.
A method of producing an amorphous ribbon having a thickness of up to several tens of μm, heat-treating the amorphous ribbon at a predetermined temperature to crystallize it, and then pulverizing it into a predetermined size to obtain a fine powder is used. In addition, as in the atomization method, high-pressure gas is concentrated from multiple directions at the ejection port of metal, metal compound, or alloy containing rare earth metal melted in the crucible, and the molten alloy ejected from the nozzle port is atomized. In addition, a method of directly producing fine powder of an amorphous rare earth alloy has been attempted. Since the rare earth magnetic alloy powder produced by such a liquid quenching method becomes an amorphous body in production, as described above, it is heat-treated at a predetermined temperature equal to or higher than the crystallization temperature to crystallize the coercive force. _(i H _c) and the residual magnetic flux density were to enhance the _{(B r).}

[0004]

However, in the normal heat treatment, the crystal growth causes the hard magnetic crystals in the magnetic particles to become coarse, or the width of the grain size distribution to become wide. When the grain size of the hard magnetic crystal becomes large, the coercive force of the hard magnetic crystal itself decreases, and when the width of the grain size distribution becomes wide, the crystal whose magnetization direction is reversed at a low applied magnetic field and the magnetization which is easily applied even at a high applied magnetic field since the greater the crystal direction is not reversed, in the above conventional heat treatment, it is difficult to increase the coercive force _{(i H c)} and the residual magnetic flux density (B _r). Further, in the above-mentioned conventional rare earth magnetic alloy, as shown by the broken line in FIG. 5, the “shoulder tension” in the second and fourth quadrants of the BH curve becomes low, so that the maximum energy of sufficient magnitude is obtained. There is a problem that a rare earth bonded magnet having a product (BH) _Max cannot be obtained. Further, as a method of controlling the grain size distribution of crystals in the magnetic powder, a method of adding a fourth element for manipulating the grain boundaries has been proposed, but the maximum energy product ( BH) There was a limit to the improvement of _Max .

The present invention has been made in view of the problems of the prior art, and is a rare earth magnetic alloy powder having a high coercive force and a high remanence, in which fine crystals of a hard magnetic material are deposited in the rare earth magnetic alloy powder. It is an object of the present invention to provide a rare earth bonded magnet produced by using this magnetic powder and having excellent magnetic properties.

[0006]

The finely crystallized rare earth magnetic alloy according to claim 1 of the present invention is an amorphous rare earth alloy mainly composed of iron, which is amorphous or crystalline composed of a soft magnetic material. In a metal or a metal compound, fine crystals composed of a hard magnetic substance and having an average major axis of crystals of 30 nm or more and less than 100 nm and a shortest distance between crystals of 10 nm or more and less than 50 nm are deposited. To do. That is, the finely crystallized rare earth magnetic alloy of the present invention is composed of a main phase and a sub phase, which are ferromagnetic substances containing iron as a main component, and the main phase has a hard magnetic property with an average major axis of crystals of 30 nm or more and less than 100 nm. Is a crystal composed of a body, the sub-phase is an amorphous or crystalline metal or metal compound composed of a soft magnetic material, and the main phase in the non-crystal or the crystal constituting the sub-phase is the shortest. It has a structure in which islands are present at intervals of 10 nm or more and less than 50 nm. This together with refining the grain size of the crystals in the magnetic particles as, (a state free too coarse or fine too crystals) to narrow the particle size distribution coercive force by _{(i H c)} and the residual magnetic flux density ( B _r ) can be increased, and a large (maximum energy product (BH) _Max ) of “shoulder tension” in the second and fourth quadrants of the BH curve as shown by the solid line in FIG. A (large) rare earth magnetic alloy can be obtained. Furthermore, by mixing a nano-sized hard magnetic material phase and a soft magnetic material phase in the magnetic alloy composition, it is possible to suppress the magnetization reversal due to the interaction between the two phases (exchange spring effect), The coercive force _i H _c (or _B H _c ) can be increased, and the maximum energy product (BH) _Max can be improved.

The finely crystallized rare earth magnetic alloy according to a second aspect is the finely crystallized rare earth magnetic alloy according to the first aspect, wherein 90% of the crystal grains of the hard magnetic material has an average grain size of 3 It is less than double. Here, the above 9
The 0% crystal diameter refers to the crystal diameter of 90% counted from the smallest diameter in an aggregate of crystals having various crystal diameters. In addition, as a measuring method, SEM,
1000 per field of view in backscattered electron images of electron microscopes such as TEM and FIB, or magnetic distribution images of MFM
Using at least three visual fields in which at least one crystal is recognized, the major axis of 1000 crystals (total of 3000 or more) per visual field is measured to obtain the average value and 90% crystal diameter.

The finely crystallized rare earth magnetic alloy according to a third aspect of the invention is characterized in that the fine crystals of the hard magnetic material are ferromagnetic materials containing iron as a main component.
In the finely crystallized rare earth magnetic alloy according to claim 4, the amorphous or crystalline metal or metal compound composed of the soft magnetic material is at least one of α-Fe, iron boride and iron nitride. It is a feature. The finely crystallized rare earth magnetic alloy may contain a rare earth-rich phase having weak (or no) magnetism in addition to the main phase and the subphase. The finely crystallized rare earth magnetic alloy according to claim 5 is characterized in that the coercive force _i H _c is 800 kA / m or more and the residual magnetic flux density B _r is 1.0 T or more. The finely crystallized rare earth magnetic alloy according to claim 6 has a maximum energy product of 200 kJ / m ³ or more. Microcrystals of rare earth magnetic alloy according to claim 7, the maximum energy product _(BH) M ax _(kJ
/ M ³ ), residual magnetic flux density B _r (T) and coercive force _i H
Ratio with product of _c (kA / m) ((BH) _Max / (Br _r
i H _c )) is 0.22 or more.

In the finely crystallized rare earth magnetic alloy according to the present invention, the ferromagnetic material is Nd _x Fe _{1-x- y By.}
It is characterized by being an alloy. However, 0.08 ≦ x ≦ 0.30, 0.02 ≦ y ≦ 0.2
(8) The finely crystallized rare earth magnetic alloy according to claim 9 is characterized in that the ferromagnetic material is a (Fe _1-x Sm _x ) _1-y N _y alloy. However, 0.07 ≦ x ≦ 0.30, 0.001 ≦ y ≦ 0.
20. The finely crystallized rare earth magnetic alloy according to claim 10, wherein the crystal made of the hard magnetic material is an Fe _1-x Sm _x alloy, and the amorphous or crystalline metal or metal compound made of a soft magnetic material is α-. It is characterized by using Fe. However, 0.07 ≦ x ≦ 0.30

The finely crystallized rare earth magnetic alloy according to claim 11 is characterized in that the amorphous rare earth alloy is produced by a liquid quenching method such as a melt span method or an atomizing method for rapidly cooling the molten alloy. To do. The finely crystallized rare earth magnetic alloy according to claim 12 jets a high-pressure inert gas from an upper portion of the rare earth alloy melted in the crucible and jets the molten metal from a nozzle opening provided in the lower portion of the crucible. An inactive gas is blown laterally onto the jetted molten alloy to produce fine powder of the amorphous rare earth alloy.

A rare earth bonded magnet according to a thirteenth aspect is a resin binder such as a thermoplastic resin or a thermosetting resin obtained by adding the finely crystallized rare earth magnetic alloy according to any one of the first to twelfth aspects. It is characterized by being formed by molding a resin magnet composition which is mixed and dispersed in. A rare earth bonded magnet according to a fourteenth aspect is characterized by being formed by pulverizing the finely crystallized rare earth magnetic alloy into powder having an average particle size of 20 to 30 μm and then molding the powder. In the rare earth bonded magnet according to claim 15, the binder is a thermosetting resin such as an epoxy resin, the thermosetting resin is 7 to 0.5 parts by weight, and the finely crystallized rare earth magnetic alloy is 93 to. It is characterized by being formed by compression molding a resin magnet composition containing 99.5 parts by weight. The rare earth bonded magnet according to claim 16 has a coercive force of 650.
kA / m or more and the maximum energy product is 180 kJ / m ³ or more.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing an outline of an apparatus for producing an amorphous rare earth alloy powder, which is a raw material for a finely crystallized rare earth magnetic alloy of the present invention, in which 1 is a high frequency induction furnace equipped with an induction coil 1C, 2 is a crucible for melting a rare earth magnetic alloy, which has a nozzle 3 at the bottom,
In addition to supplying Ar gas, which is an inert gas, to the crucible 2 as described above, a high pressure A 4 is supplied from above the molten rare earth magnetic alloy.
An injection gas supply device 5 for injecting r gas is a cooling gas injection device which has a jet nozzle 6 and blows He gas which is an inert gas onto the molten alloy ejected from the nozzle 3. In this example, a case of producing an NdFeB alloy as an amorphous rare earth alloy containing iron as a main component will be described. First, the raw material ferroboron (Fe
The mixture of B) and the solid matter of Fe and Nd is mixed in the crucible 2 at a composition ratio such that the alloy composition is usually prepared, for example, Nd ₂ Fe ₁₄ B, and the mixture is put in the crucible 2. 2 is installed inside the induction coil 1C of the high frequency induction furnace 1, and a high frequency current is passed through the induction coil 1C in an Ar gas atmosphere to inductively heat the mixture, thereby melting the metal element in the mixture. Melted NdFe
B alloy is prepared. Next, in the molten state, the injection gas supply device 4 is operated to inject Ar gas at a predetermined pressure from the upper portion of the molten NdFeB alloy (hereinafter referred to as the molten alloy), so that the molten alloy is melted in the crucible. In addition to jetting downward from the jet outlet 3S of the second nozzle 3, the jet nozzle 6S of the jet nozzle 6 of the cooling gas jetting device 5 jets the molten alloy from the lateral direction in synchronization with the jetting of the Ar gas. A jet stream of He gas is blown to collide the jetted molten alloy with the He gas, and the energy of this collision causes the molten metal to scatter and rapidly solidify. This gives a particle size of 30
It is possible to obtain fine powder of NdFeB amorphous alloy having a substantially spherical outer shape with a size of not more than μm.

[0013] Then, a part is crystallized by heat-treating a fine powder of the amorphous rare earth alloy, enhances the coercive force _{(i H c)} and the residual magnetic flux density (B _r). In this example, 400 to 10 at a temperature rising rate of 100 ° C./sec or more for the fine powder.
Fine crystals having a two-phase structure in which a main phase is a fine crystalline material and a subphase is a soft magnetic material, which is an amorphous or crystalline metal or metal compound, by performing a heat treatment of rapidly heating to 00 ° C and then rapidly cooling. A rare earth element magnetic alloy is prepared. If the temperature is short, the temperature may be maintained at the predetermined temperature for a predetermined time after the temperature is raised. Specifically, as shown in the schematic diagram of FIG. 2, in the finely crystallized rare earth magnetic alloy 10, the fine crystals constituting the main phase 11 (here, Nd ₁₂ Fe ₈₂ B ₆ phase) have an average long diameter l. Is 30nm or more, 100n
It is made of a hard magnetic material of less than m and has a sub-phase 12 (here, α-
Fe phase and / or iron boride) are amorphous or crystalline rare earth alloys composed of a soft magnetic material, and the amorphous or crystalline rare earth alloys composed of a soft magnetic material constituting the subphase 12 are The crystallites that make up the main phase 11
It has an island-like structure with a distance L of 10 nm or more and less than 50 nm at the shortest. As for the particle size distribution of the fine crystals, 90% crystal diameter is preferably less than 3 times the average particle diameter. Further, as the method of the rapid heating, fine powder of the amorphous rare earth alloy is, for example, in a heating means such as an induction coil of a high frequency heating furnace or a gold mirror halogen heater, or at a high temperature heated by a heater or the like. The inert gas may be passed through the channel for rapid heating, or the amorphous rare earth alloy may be irradiated with high-power laser light for rapid heating. As a result, the fine crystals having a uniform grain size can be precipitated in the amorphous rare earth alloy.

The finely crystallized rare earth magnetic alloy thus obtained has a high coercive force _i H _c of 800 kA / m or more, a residual magnetic flux density B _r of 1.0 T or more, and a maximum energy product (BH) _Max. It has excellent magnetic properties of 200 kJ / m ³ or more. Further, it is possible to obtain a finely crystallized rare earth magnetic alloy having a high ratio of the maximum energy product, the product of the residual magnetic flux density and the coercive force of 0.22 or more and a high “shoulder”. This is because when the amorphous rare earth alloy fine powder is rapidly heated under the above conditions, crystal nuclei are simultaneously generated in the fine powder, but the temperature rise is completed without being given a period during which the crystal grows. , Because finer crystals having a uniform particle size are generated, especially when the crystalline substance is a ferromagnetic substance (for example, SmFeN alloy) whose coercive force generation mechanism does not depend on the pinning type. Shows higher coercive force as the size of the crystal is smaller. That is, if the crystals are fine and the particle size distribution is uniform as described above, not only the coercive force of each crystal increases and the average coercive force is improved, but also the coercive force distribution is uniform, so that the coercive force and This is because the residual magnetic flux density can be increased and the maximum energy product can also be improved. Moreover, since the finely crystallized rare earth magnetic alloy of the present invention contains a nano-sized hard magnetic material phase (main phase) and a soft magnetic material phase (sub phase) in the magnetic alloy composition,
Since the magnetization reversal is suppressed by the exchange spring effect,
The coercive force is further increased, and the maximum energy product can be improved.

Next, a method for producing a bonded magnet using the fine powder of the finely crystallized rare earth magnetic alloy will be described. The isotropic rare earth bonded magnet is a binder made of a fine powder of Nd ₂ Fe ₁₄ B alloy heat-treated by the above method and a thermoplastic resin such as nylon, polyethylene or EVA (ethylene-vinyl acetate copolymer). Binder),
Alternatively, a resin magnet composition is prepared by dispersing it in a binder made of a thermosetting resin such as an epoxy resin, a melamine resin, or a phenol resin, and the resin magnet composition is formed into a molding die in the same manner as known plastic molding. It can be obtained by magnetizing a molded product, which has been molded into a desired shape by injection molding, compression molding or extrusion molding, into a desired magnetization pattern. A method of simultaneously magnetizing the above-mentioned magnetization pattern at the time of molding is also used in many cases. As described above, the finely crystallized rare earth magnetic alloy of the present invention has a particle size of 30 μm or less in which the amorphous rare earth alloy is produced by laterally blowing an inert gas to the molten alloy ejected from the nozzle opening of the crucible. Since the outer shape is almost spherical fine powder, it can be used as it is as a material for bonded magnets. The average particle size is 20 to 3 before or after the heat treatment.
It is preferable to shape the powder after pulverizing it to 0 μm.
It is also possible to give anisotropy by forming the resin magnet composition while orienting it in a magnetic field to produce an anisotropic bonded magnet. Further, in order to obtain high magnetic force, compression molding which requires a small amount of binder resin is preferable. At that time, the binder resin is a thermosetting resin such as an epoxy resin, and the thermosetting resin is 7- 0.5 parts by weight, 93 to 99.5 parts by weight of the finely crystallized rare earth magnetic alloy is preferably compounded and molded, and 5 to 3 parts by weight of the thermosetting epoxy resin and the finely crystallized rare earth magnetic alloy are used. More preferably, it is 95 to 97 parts by weight. This makes it possible to obtain a rare earth bonded magnet having a coercive force of 650 kA / m or more and a maximum energy product of 180 kJ / m ³ or more.

In the above embodiment, the molten alloy composition
To Nd_TwoFe₁₄It is B, but it is not limited to this
The composition of the hard magnetic material of the main phase is Nd._xFe_1-xyB_y
(0.08 ≦ x ≦ 0.30, 0.02 ≦ y ≦ 0.28)
If the compounding ratio is such that
Finely crystallized rare earth with high density and large maximum energy product
It is possible to produce magnetic alloys and rare earth bonded magnets.
It The composition of the rare earth alloy is NdFeB above.
The SmFe alloy, or
Made of other ferrous rare earth magnetic alloys such as SmFeN alloy
To finely crystallized rare earth magnetic alloys and rare earth bonded magnets
However, it can be manufactured by the same method. In addition, S
In the case of mFe alloy, as the composition of the hard magnetic material of the main phase
Is Fe_1-xSm_x(0.07 ≦ x ≦ 0.30),
Amorphous or crystalline metal or gold made of soft magnetic material
The genus compound is α-Fe. In the case of SmFeN alloy,
In this case, the composition of the hard magnetic substance of the main phase is (Fe_1-xSm_x)
_1-yN _y(0.07 ≦ x ≦ 0.30, 0.001 ≦ y
≤ 0.20), and is made of a soft magnetic material such as amorphous or crystalline.
Amorphous metal or metal compound is α-Fe or iron nitride
Either or both.

[Example] Amorphous rare earth magnetic alloy fine powder having a particle size of 30 μm or less and a substantially spherical outer shape, which was manufactured by the manufacturing method shown in the above-mentioned embodiment, was put into a ventilated mesh container, Immediately before this container, use a heater etc.
The amorphous rare earth magnetic alloy fine powder is rapidly heated by moving the flow path of high-purity Ar gas heated to 50 ° C. from the direction crossing the flow path at a controlled and predetermined speed. As shown in Fig. 3, we prepared fine powder of finely crystallized rare earth magnetic alloy by precipitating fine crystals of hard magnetic material in amorphous or crystalline metal or metal compound of soft magnetic material. The properties were measured. Next, a compression-bonded magnet was produced by molding a resin magnet composition in which the fine powder was mixed and dispersed in an epoxy resin by compression molding, and its magnetic characteristics were measured. The magnetic properties of the magnetic powder and the compressed bond magnet are shown in the table of FIG. As a comparative example,
The structure and magnetic properties of the magnetic powder and compression bonded magnet produced by the ordinary heat treatment method are also shown. As shown in the table of FIG. 3, the magnetic powder of the present invention is composed of a main phase and a sub-phase, and the grain size of the hard magnetic material constituting the main phase is significantly smaller than that of the comparative example. They also keep a proper distance and do not touch each other. Further, the magnetic powder of the present invention,
As shown in the table of FIG. 4, the coercive force _i H _c is 830 kA / m.
As described above, the residual magnetic flux density B _r is as high as 1.1 T or more, and
The maximum energy product (BH) _Max also exhibited excellent magnetic characteristics of 240 kJ / m ³ or more, and the ratio of the maximum energy product to the product of the residual magnetic flux density and the coercive force was 0.22 or more. The compression bond magnet also has a coercive force of 690k.
It was confirmed that excellent magnetic properties were obtained with A / m or more and a maximum energy product of 210 kJ / m ³ or more.

[0018]

As described above, according to the present invention,
An amorphous rare earth alloy containing iron as a main component, in an amorphous or crystalline metal or metal compound composed of a soft magnetic material,
The average of the major axis of the crystal composed of a hard magnetic material is 30 nm or more,
Less than 100 nm and the shortest distance between crystals is 10 nm
As described above, since fine crystals of less than 50 nm are deposited to refine the crystals in the magnetic powder and narrow the grain size distribution of the crystals, the coercive force ( _i H _c ) and the residual magnetic flux density (B
_r ) can be increased and a finely crystallized rare earth magnetic alloy with a high maximum energy product (BH) _Max can be obtained. Further, a rare earth bonded magnet having a high magnetic force can be obtained by molding a resin magnet composition in which fine powder of such a finely crystallized rare earth magnetic alloy is mixed and dispersed in a resin binder.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an outline of an apparatus for producing fine powder of an amorphous rare earth alloy according to the present embodiment.

FIG. 2 is a diagram showing a model of finely crystallized rare earth magnetic alloy powder according to the present invention.

FIG. 3 is a table showing an example of the structure of a finely crystallized rare earth magnetic alloy according to the present invention.

FIG. 4 is a table showing an example of magnetic characteristics of a finely crystallized rare earth magnetic alloy according to an example of the present invention.

FIG. 5 is a diagram showing a BH loop of a rare earth magnetic alloy.

[Explanation of symbols]

1 high frequency induction furnace, 1C induction coil, 2 crucible, 3
Nozzle, 3S Nozzle ejection port, 4 Injection gas supply device, 5 Cooling gas injection device, 6 Jet nozzle, 10
Finely crystallized rare earth magnetic alloy, 11 main phases, 12 sub-phases.

Claims (16)

[Claims] 1. An amorphous rare earth alloy containing iron as a main component,
An amorphous or crystalline metal or metal compound composed of a soft magnetic material, the mean major axis of the crystals composed of a hard magnetic material is 30 nm or more and less than 100 nm, and the shortest distance between the crystals is 10 nm or more and less than 50 nm. A finely crystallized rare earth magnetic alloy, characterized in that the fine crystals of are precipitated. 2. 90% of the fine crystals of the hard magnetic material
The finely crystallized rare earth magnetic alloy according to claim 1, wherein the crystal diameter is less than 3 times the average particle diameter. 3. The fine crystal composed of the hard magnetic material is a ferromagnetic material containing iron as a main component.
Alternatively, the finely crystallized rare earth magnetic alloy according to claim 2. 4. The amorphous or crystalline metal or metal compound composed of the soft magnetic material is at least one of α-Fe, iron boride, and iron nitride.
2. A finely crystallized rare earth magnetic alloy as set forth in. 5. The finely crystallized rare earth magnetic alloy according to claim 3, which has a coercive force of 800 kA / m or more and a residual magnetic flux density of 1.0 T or more. 6. The finely crystallized rare earth magnetic alloy according to claim ^3, wherein the maximum energy product is 200 kJ / m ³ or more. 7. The finely crystallized rare earth magnetic alloy according to claim 3, wherein the ratio of the maximum energy product to the product of the residual magnetic flux density and the coercive force is 0.22 or more. 8. The ferromagnetic material is Nd _x Fe _1-x-y B
The finely crystallized rare earth magnetic alloy according to any one of claims 3 to 7, which is a _y alloy. However, 0.08 ≦ x ≦ 0.30, 0.02 ≦ y ≦ 0.2
8 9. The ferromagnetic material is (Fe _1-x Sm _x ).
_1-y N _y alloy and the fact that said claims 3 to 7 microcrystals of rare earth magnetic alloy according to any one of. However, 0.07 ≦ x ≦ 0.30, 0.001 ≦ y ≦ 0.
20 10. A crystal comprising the above hard magnetic material is Fe
_1-x Sm and _x alloy, fine crystallization according to any one of claims 3 to 7, characterized in that the non-crystalline or crystalline metal or metal compound comprising a soft magnetic material was alpha-Fe Rare earth magnetic alloy. However, 0.07 ≦ x ≦ 0.30 11. The amorphous rare earth alloy is produced by a liquid quenching method for rapidly cooling a molten alloy such as a melt span method or an atomizing method, according to any one of claims 1 to 10. A finely crystallized rare earth magnetic alloy as described in 1. 12. A high-pressure inert gas is jetted from the upper portion of the rare earth alloy melted in the crucible, the molten metal is jetted from a nozzle port provided in the lower portion of the crucible, and the molten metal is horizontally fed to the jetted molten alloy. The finely crystallized rare earth magnetic alloy according to claim 11, wherein the amorphous rare earth alloy is produced by spraying an inert gas from the direction. 13. A rare earth bonded magnet, which is formed by molding a resin magnet composition in which the finely crystallized rare earth magnetic alloy according to claim 1 is mixed and dispersed in a resin binder. 14. The rare earth bonded magnet according to claim 13, wherein the finely crystallized rare earth magnetic alloy is pulverized into powder having an average particle size of 20 to 30 μm and then molded. 15. A resin magnet composition in which the binder is a thermosetting resin, 7 to 0.5 parts by weight of the thermosetting resin, and 93 to 99.5 parts by weight of the finely crystallized rare earth magnetic alloy are blended. 15. The rare earth bonded magnet according to claim 13 or 14, which is formed by compression molding a material. 16. The rare earth bonded magnet according to claim 13, which has a coercive force of 650 kA / m or more and a maximum energy product of 180 kJ / m ³ or more.