KR101309516B1 - Preparation method for magnetic metallic glass nano-powder - Google Patents

Abstract

PURPOSE: A method for manufacturing magnetic and amorphous metal nano powder is provided to manufacture amorphous powder only using a portion where solidified nano particles are positioned after two-phase separation amorphous metal is manufactured. CONSTITUTION: A method for manufacturing magnetic and amorphous metal nano powder is as follows: a first step of mixing and melting materials with magnetic elements; a second step of manufacturing two-phase separation amorphous metal which is divided into a matrix and particles by rapidly solidifying the molten materials; a third step of separating the two-phase separation amorphous metal according to the size of the particles; and a fourth step of selectively melting the matrix containing the two-phase separation amorphous metal to manufacture the amorphous metal nano powder. The second step is implemented by a melt spinning method. The third step is individually implemented to upper and lower portions of the two-phase separation amorphous metal. The fourth step is implemented to the lower portion of the two-phase separation amorphous metal. [Reference numerals] (AA) Manufacture a melt spinning two-phase separation amorphous metal ribbon; (BB) Separate the two-phase separation amorphous metal ribbon into upper and lower parts; (CC) Selectively melt a two-phase separation amorphous metal ribbon in a matrix; (DD) Post-process remaining materials; (EE) Amorphous nano powder

Description

Magnetic amorphous metal nano powder manufacturing method {PREPARATION METHOD FOR MAGNETIC METALLIC GLASS NANO-POWDER}

The present invention relates to a method for producing amorphous metal nano powder, and more particularly to a method for producing amorphous metal nano powder exhibiting magnetic properties.

Most metal alloys form crystal phases in which the arrangement of atoms is regular at the time of solidification from the liquid phase. However, if the cooling rate at the time of solidification is sufficiently above the threshold value to limit the nucleation and growth of the crystal phase, the irregular atomic structure of the liquid phase can remain intact. Such alloys are commonly referred to as amorphous alloys or metallic glass. Amorphous alloys have a tensile strength of about 2 to 3 times higher than crystalline alloys, and are known to be used as catalysts due to their excellent corrosion resistance or rapid corrosion due to the uniformity of the structure having no grain boundaries.

On the other hand, the amorphous powder can be used as a building block for the fabrication of nano-structured materials, reinforcement of polymer materials, low melting point alloys and catalysts, and when the particle size reaches tens of nanometers in the late 20th century, It has been found that the properties of matter change significantly.

In particular, in 1959, by Richard P. Feynman, and by Eric K. Drexel over 20 years ago, a whole new field of study was undertaken to control the physical and chemical properties of nanoscale materials. Today, these nanostructured materials are expected to be a major part of future electrical, magnetic and mechanical devices.

Processes for making these nanomaterials include chemical vapor deposition, physical vapor deposition, precipitation, reactive sputtering, laser pyrolysis, and arc plasma processes. process, pulse wire explosion, mechanical alloying, grinding or sol-gel technique.

However, most of these processes usually require complex processes and expensive equipment and often cannot control the atomic structure. For example, chemical vacuum deposition, arc plasma processing, pulsed wire explosion, or mechanical alloying can form meta-stable structures such as amorphous, but only stable atomic structures, such as precipitation and sol-gel, Is achieved.

In addition, in most of the processes described above, it is impossible to produce amorphous powders, and in particular, it is difficult to have a spherical and smooth surface, and powders aggregate together.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to provide a method of manufacturing an amorphous nano powder having magnetic properties.

Magnetic amorphous metal nano powder manufacturing method according to the present invention for achieving the above object, the first step of mixing and melting the raw material containing the elements exhibiting magnetic at room temperature; A second step of rapidly solidifying the molten raw material to produce a two-phase separated amorphous metal divided into a matrix phase and a precipitate phase spherically deposited in the matrix phase; A third step of separating the two-phase separated amorphous metal according to the size distribution of the precipitated phase; And a fourth step of selectively dissolving only the known phase of the separated two-phase separated amorphous metal to prepare an amorphous metal powder.

Two-phase separated amorphous metal materials have an immiscible region in the liquid state below a certain temperature and are separated into two distinct liquid phases in a rapid cooling process, and finally, amorphous materials having two different compositions Refers to an amorphous metal material that exists separately. As a rapid solidification method for manufacturing such a phase-separated amorphous metal, a method such as melt spinning, injection casting, and traction casting, which are generally used to manufacture an amorphous metal, may be used, and it may be selected in consideration of the amorphous forming ability of the amorphous metal. Do.

In this case, the two phases present in the amorphous metal material may be manufactured so as to exist in the form of matrix phases continuously positioned through the composition control and precipitated phases spherically deposited in the matrix phases.

The spherical precipitated phase precipitated in the matrix phase of the two-phase separated amorphous metal material is relatively small in size compared to the other portion in the portion having high subcooling rate and fast cooling rate, and thus has an even diameter in nano units. The inventors of the present invention have developed a method for producing a magnetic amorphous metal nanopowder having a nano size diameter by separating the two-phase separated amorphous metal material according to the size of the precipitated phase by using the classification characteristics of the precipitated phase shown in the two-phase separated amorphous metal material. It was.

In this case, the second step is performed by the melt spinning method, the third step is performed by separating the two-phase separated amorphous metal into the upper and lower portions in the thickness direction, the fourth step is to the lower portion of the two-phase separated amorphous metal separated in the thickness direction Preferably to be carried out.

Melt spinning, a typical rapid solidification method for manufacturing amorphous metal materials, ejects a completely melted raw material onto a rotating disk or wheel, thereby rapidly cooling the raw material spread into the air by the rotational force of the disk or wheel. A ribbon-shaped amorphous metal material is formed. The biphasic amorphous metal material manufactured by such melt spinning can be divided into the upper part of the free side located opposite to the lower part of the wheel side contacting the wheel in the manufacturing step, and the lower part of the wheel direction relatively. Because of the large degree of supercooling and fast cooling rate, precipitated phases with smaller diameters are distributed. Therefore, when the fourth step is performed by separating only the lower part located in the lower direction in the thickness direction, it is possible to obtain an amorphous powder evenly divided into nano sizes.

In this case, the magnetic phase-separated amorphous metal is represented by the formula (Y, Gd) _x Ti _{100- (x + y + z)} Al _y (Co, Ni) _z , and x, y, z are each represented by 20% by atom. X ≦ 40, 20 ≦ y ≦ 30, and 15 ≦ z ≦ 25.

The magnetic biphasic amorphous metal is represented by the formula Zr _p (Nd, Pr, Ce, La, Gd, Y) _{100- (p + q + r)} Al _q (Co, Ni) _r , p, q, r Silver atomic percent may be 5 ≦ p ≦ 30, 5 ≦ q ≦ 15, and 25 ≦ r ≦ 35, respectively.

The magnetic phase-separated amorphous metal is represented by the formula Ni _s Nb _{50-s / 2} Y _{50-s / 2} , and s may be ₅₀ ≦ s ≦ 70 in atomic%.

Magnetic phase-separated amorphous metal ribbon is represented by the formula [(Fe, Co) _i Si _j B _100-ij ] _k Cu _100-k , i, j, k in atomic%, respectively 70≤i≤80, 5 ≦ j ≦ 15 and 10 ≦ k ≦ 50.

In particular, in a fourth step of manufacturing an amorphous metal powder, it is preferable that the method of selectively dissolving the matrix is carried out by immersion in HNO ₃ solution, the concentration of HNO ₃ solution is preferably in 0.1M to about 1M.

Furthermore, by applying ultrasonic waves and temperature in the process of selectively dissolving only the known phase by immersing in HNO ₃ solution, the rate of dissolution reaction can be improved by about 20 times or more.

The magnetic amorphous metal nanopowder according to another embodiment of the present invention is prepared by the above method, and the amorphous metal powder is composed of only a spherical precipitated phase of a two-phase separated amorphous metal containing elements having magnetic properties at room temperature, and the spherical precipitation The phase may have a shell structure or a yard structure formed in a two-phase separation process, and may have unique magnetic properties due to compositional unevenness of magnetic elements located inside the amorphous metal powder.

According to the present invention configured as described above, after preparing a two-phase separated amorphous metal containing an element having magnetic properties at room temperature, the amorphous powder is prepared using only the portion where the nano-scale precipitated phase is distributed according to the classification state of the precipitated phase. There is an effect that can be produced in a state-controlled nano-sized amorphous magnetic nano powder.

The amorphous magnetic nanopowder of the present invention is composed of a precipitated phase having a shell structure or a yard structure formed in a two-phase separation process, and thus has unique magnetic properties due to compositional unevenness of magnetic elements located inside the amorphous metal powder. It is effective to provide an amorphous magnetic nano powder having a.

In addition, by applying ultrasonic waves and temperature in the process of selectively dissolving the matrix phase of the two-phase separated amorphous metal ribbon, there is an effect that can increase the process speed by more than 20 times.

1 is a flowchart illustrating a process of preparing amorphous metal nanopowder by rapid solidification by a melt spinning method according to an embodiment of the present invention.
Figure 2 is a schematic diagram showing a state of producing a two-phase separated amorphous metal ribbon by the melt spinning method.
3 is a graph showing the transmission electron micrograph and spectral distribution of each phase of the Y ₂₈ Ti ₂₈ Al ₂₄ Co ₂₀ amorphous metal material prepared by the melt spinning method.
Figure 4 is a photograph showing the classification of the two-phase separated amorphous alloy ribbon prepared by the melt spinning method and the nano powder prepared in this embodiment.
5 is a graph showing the time for selectively dissolving the matrix of the biphasic amorphous metal ribbon according to the present embodiment.
6 is a scanning microscope photograph of the amorphous metal nano powder prepared according to the present embodiment.
7 is an X-ray diffraction analysis result of the amorphous metal nano powder and the general amorphous metal materials prepared according to the present embodiment.
8 is a graph showing the saturation magnetization value according to the temperature measured by SQUID for the amorphous metal nano powder prepared according to the present embodiment.
9 is a graph comparing the magnetic properties of the amorphous metal nano powder and the amorphous metal ribbon prepared according to the present embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the accompanying drawings, embodiments of the present invention will be described in detail.

1 is a flowchart illustrating a process of preparing amorphous metal nanopowder when rapid solidification is a melt spinning method according to an embodiment of the present invention.

The process of manufacturing the amorphous metal nano powder of the present embodiment comprises the steps of preparing a two-phase separated amorphous metal ribbon by the melt spinning method, the size of the precipitated phase by the difference between supercooling and cooling rate of the two-phase separated amorphous metal ribbon prepared by the melt spinning method Separating into upper and lower distinct distributions and selectively dissolving only the known phase in the separated two-phase separated amorphous metal ribbon.

Manufacture of Two-Phase Amorphous Amorphous Metal Ribbons by Melt Spinning Method

Figure 2 is a schematic diagram showing a state of producing a two-phase separated amorphous metal ribbon by the melt spinning method.

The melt spinning method is a method of forming a ribbon-shaped amorphous metal material by rapidly cooling raw material melted completely onto a rotating disk or wheel, and rapidly cooling the raw material spread in the air by the rotational force of the disk or wheel. Melt spinning method is one of the general methods for producing a ribbon-shaped amorphous material, so a detailed description thereof will be omitted, and various process conditions may be applied according to the characteristics of the amorphous metal material to be manufactured.

Two-phase separated amorphous metal materials have an immiscible region in the liquid state below a certain temperature and are separated into two distinct liquid phases in a rapid cooling process, and finally, amorphous materials having two different compositions Refers to an amorphous metal material that exists separately. In this case, the two phases present in the amorphous metal material may be manufactured to exist in the form of matrix phases continuously positioned through the composition control and precipitated phases spherically deposited in the matrix phases.

3 is a graph showing the transmission electron micrograph and spectral distribution of each phase of the Y ₂₈ Ti ₂₈ Al ₂₄ Co ₂₀ amorphous metal material prepared by the melt spinning method.

As shown, it can be seen that the Y ₂₈ Ti ₂₈ Al ₂₄ Co ₂₀ amorphous metal material is separated into two amorphous phases, a continuous matrix phase and a spherical precipitate phase, when the solid spinning method is prepared by rapid spinning. In addition, while the precipitated phase has a high content of Ti, it can be seen that the known phase has a high content of Y.

Separation of two-phase separated amorphous metal ribbon manufactured by melt spinning method into upper and lower parts

As shown in FIG. 2, the amorphous metal ribbon manufactured by the melt spinning method may be divided into a lower part contacting the wheel in the manufacturing process and an upper part contacting the air continuously without contacting the wheel. Hereinafter, for convenience, referred to as a free side and a wheel side.

The inventors of the present invention have developed a method for classifying the particle size of the precipitated phase by using the difference between the supercooling and the cooling rate in the cooling process in the free direction and the wheel direction when manufacturing the two-phase separated amorphous metal ribbon by the melt spinning method.

Specifically, in the biphasic amorphous metal ribbon, the lower wheel direction is evenly distributed in the small particle, while the upper free direction includes the large particle and the particle size is unevenly distributed.

At this time, the thickness range of the ribbon in which nano-sized particles can be formed from the direction of the wheel below the two-phase separated amorphous metal ribbon can be adjusted according to the process conditions such as the alloy composition and the thickness of the manufacturing ribbon.

Manufacture of amorphous metal powder by dissolving matrix of two-phase separated amorphous metal ribbon

In this example, the separated two-phase separated amorphous metal ribbon is immersed in HNO ₃ solution to selectively dissolve only the known phase. 2 the principle of phase separation by dissolving only the optional matrix of amorphous metal ribbon by a HNO ₃ solution is that the reactivity of the constituent elements and HNO ₃ solution contained in the matrix is higher. Therefore, in the present embodiment, while designing the amorphous alloy so that the composition material to be prepared as a powder in the design phase as a precipitate phase, it is necessary to design an amorphous alloy with a difference in reactivity to selectively dissolve only a continuous matrix phase. At this time, when the passivation film is formed on the surface of the precipitated phase by the constituent elements included in the precipitated phase in the process of selectively dissolving the matrix phase, it is possible to obtain the effect of preventing the dissolution of the precipitated phase.

On the other hand, the immersion in HNO ₃ solution only takes a very long time to dissolve the matrix phase, in this embodiment, dissolution time by ultrasonic application and heating in the state of immersing the two-phase separated amorphous metal ribbon in HNO ₃ Can be greatly reduced to 1/20.

After all of the matrix phase is dissolved and the precipitated phase powder is first dispersed in ethanol, the powder is recovered, and finally, amorphous metal powder is prepared by removing all the residual solvent in a high vacuum state.

Figure 4 is a photograph showing the classification of the two-phase separated amorphous alloy ribbon prepared by the melt spinning method and the nano powder prepared in this embodiment. The target material is Y ₂₈ Ti ₂₈ Al ₂₄ Co ₂₀ amorphous metal material.

As shown in FIGS. 4A and 4B, the wheel direction of the two-phase separated amorphous metal ribbon is evenly distributed among the precipitated phases having a diameter of about 100 nm or less, while the free direction of the two-phase separated amorphous metal ribbon has very large diameters. It can be seen that the precipitated phases with small diameters are mixed.

Therefore, if the two-phase separated amorphous alloy ribbon prepared by the melt spinning method is separated into the upper and lower portions, and the amorphous metal material powder is prepared by selectively dissolving the matrix phase of the lower wheel direction portion and leaving only the precipitated phase, the particle size is as shown in Figure 4c. Small amorphous metal nano powders can be produced. The process of selectively dissolving the matrix phase was performed by immersing in HNO ₃ solution and applying ultrasound and temperature.

The matrix phase with high Y content reacts with HNO ₃ solution,

2Y + 6H ⁺ -> 2Y ³⁺ + 3H ₂

According to the reaction scheme of Y is ionized and selectively dissolved.

On the other hand, the precipitated phase with a high content of Ti,

Ti + 2H ₂ O-> TiO ₂ + 2H ₂

Since the passivation film is formed on the surface according to the reaction scheme, it does not dissolve.

FIG. 5 is a graph showing the time for selectively dissolving the known phase of a two-phase separated amorphous metal ribbon according to this embodiment.

Y ₂₈ Ti ₂₈ Al ₂₄ Co _{20 The} time required for selectively dissolving the amorphous phase of the amorphous metal material using 0.1 M HNO ₃ solution was about 24 hours or more, compared with the ultrasonic wave and temperature as in this embodiment. In the case of addition, it rapidly decreased to about 85 minutes, and it was confirmed that the decrease was increased as the concentration of HNO ₃ solution increased. However, when the concentration of HNO ₃ exceeds 0.3M it can be seen that the width of the dissolution time decreases.

According to the present embodiment, an amorphous metal ribbon is prepared by using a melt spinning method, and an amorphous metal material capable of preparing amorphous metal nanopowder by selectively dissolving a matrix with HNO ₃ solution is prepared as follows.

Two Phase Separation Amorphous Alloy Material Composition Matrix composition Precipitation composition Powder composition (Y, Gd) _x Ti _{100- (x + y + z)} Al _y (Co, Ni) _z
20≤x≤40, 20≤y≤30, 15≤z≤25 (Y, Gd) -rich Ti-rich Ti-based amorphous Zr _p (Nd, Pr, Ce, La, Gd, Y) _{100- (p + q + r)} Al _q (Co, Ni) _r
5≤p≤30, 5≤q≤15, 25≤r≤35 (Nd, Pr, Ce, La, Gd, Y) -rich Zr-rich Zr amorphous Ni _s Nb _{50-s / 2} Y _{50-s / 2}
50≤s≤70 Ni-Nb-rich Ni-Y-rich Ni-Nb-based amorphous [(Fe, Co) _i Si _j B _100-ij ] _k Cu _100-k
70≤i≤80, 5≤j≤15, 10≤k≤50 Cu-rich (Fe, Co) -rich (Fe, Co) amorphous

(Y, Gd) _x Ti _{100- (x + y + z)} Al _y (Co, Ni) _z (20≤x≤40, 20≤y≤30, 15≤z≤25) Na-Gd-rich and Ti-rich precipitated phases were selectively dissolved in HNO ₃ solution to obtain Ti-based amorphous nanopowder.

Zr _p (Nd, Pr, Ce, La, Gd, Y) _{100- (p + q + r)} Al _q (Co, Ni) _r (5≤p≤30, 5≤q≤15, 25≤r≤35 ) Two-phase separation amorphous alloy material is separated into Nd, Pr, Ce, La, Gd or Y-rich matrix phase and Zr-rich precipitate phase, and Zr-based amorphous nanopowder can be obtained by selectively dissolving matrix phase with HNO ₃ solution. there was.

Ni _s Nb _{50-s / 2} Y _{50-s / 2} (50≤s≤70) Two-phase separation amorphous alloy material is separated into Ni-Nb-rich matrix phase and Ni-Y-rich precipitate phase, and is known as HNO ₃ solution. As a result of selectively dissolving, Ni-Y-based amorphous nanopowders could be obtained.

[(Fe, Co) _i Si _j B _100-ij ] _k Cu _100-k (70≤i≤80, 5≤j≤15, 10≤k≤50) The two-phase separated amorphous alloy material is Cu-rich matrix and Fe Alternatively, the Co-rich precipitated phase was separated, and as a result of selectively dissolving the matrix with HNO ₃ solution, an Fe-based or Co-based amorphous nanopowder was obtained.

6 is a micrograph of the amorphous metal nano powder prepared according to the present embodiment.

On the left is a nano powder prepared from Y ₂₈ Ti ₂₈ Al ₂₄ Co ₂₀ two-phase amorphous metal ribbon, and on the right is a nano powder prepared from Gd ₃₀ Ti ₂₅ Al ₂₅ Co ₂₀ two-phase amorphous metal ribbon. The average composition of the nanopowders prepared from Y ₂₈ Ti ₂₈ Al ₂₄ Co ₂₀ two-phase separated amorphous metal ribbon is Ti _54.4 Y _3.4 Al _10.2 Co _32.0 , and the nanopowders prepared from Gd ₃₀ Ti ₂₅ Al ₂₅ Co ₂₀ two-phase separated amorphous metal ribbon The average composition of Ti _55.8 Gd _2.2 Al _11.7 Co _30.4 .

Compared to the powder produced in the free direction of the ribbon located on the upper side, it can be seen that the average particle diameter of the powder produced in the wheel direction of the ribbon located on the lower side is smaller and more evenly distributed.

7 is an X-ray diffraction analysis result of the amorphous metal nano powder and the general amorphous metal materials prepared according to the present embodiment.

It can be seen that the nanopowder prepared according to the present example is in an amorphous state since all of the materials to be subjected to diffraction analysis exhibit typical amorphous diffraction peaks.

And the main peaks of nano powders prepared from Y ₂₈ Ti ₂₈ Al ₂₄ Co ₂₀ two-phase separated amorphous metal ribbon and nano powders prepared from Gd ₃₀ Ti ₂₅ Al ₂₅ Co ₂₀ two-phase separated amorphous metal ribbon were Ti ₅₆ Al ₂₄ Co ₂₀ amorphous metal. It can be seen that the Ti-based amorphous metal material is rich in Ti because of its position similar to the main peak of the material.

On the other hand, the amorphous nano-powder prepared according to the present embodiment, the spherical particles precipitated in the phase separation process forms a shell structure or yard structure through the compositional nonuniformity of the elements exhibiting magnetic properties inside the nanopowder It is characterized by its unique magnetic properties.

8 is a graph showing the saturation magnetization value according to the temperature measured by SQUID for the amorphous metal nano powder prepared according to the present embodiment.

As shown, it can be seen that the amorphous nanopowder prepared according to the present embodiment has magnetic properties at room temperature as well as at low temperature.

9 is a graph comparing the magnetic properties of the amorphous metal nano powder and the amorphous metal ribbon prepared according to the present embodiment.

As shown, Y _27.5 Ti _27.5 Al ₂₅ Co ₂₀ amorphous metal ribbon has little magnetic properties, but nano powder made from Y _27.5 Ti _27.5 Al ₂₅ Co ₂₀ and nano made from Gd _27.5 Ti _27.5 Al ₂₅ Co ₂₀ It can be seen that the powder has unique magnetic properties.

While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Those skilled in the art will understand. Therefore, the scope of protection of the present invention should be construed not only in the specific embodiments but also in the scope of claims, and all technical ideas within the scope of the same shall be construed as being included in the scope of the present invention.

Claims (11)

A first step of mixing and melting a raw material including elements having magnetic properties at room temperature;
A second step of rapidly solidifying the molten raw material to produce a two-phase separated amorphous metal divided into a matrix phase and a precipitate phase spherically deposited in the matrix phase;
A third step of separating the two-phase separated amorphous metal according to the size distribution of the precipitated phase; And
And a fourth step of selectively dissolving only the matrix phase of the separated two-phase separated amorphous metal to prepare an amorphous metal powder.
The method according to claim 1,
The second step is performed by the melt spinning method,
The third step is performed by separating the two-phase separated amorphous metal into the upper and lower in the thickness direction,
Wherein the fourth step is performed on the lower portion of the two-phase separated amorphous metal separated in the thickness direction.
The method according to claim 1,
The biphasic amorphous metal is represented by the formula (Y, Gd) _x Ti _{100- (x + y + z)} Al _y (Co, Ni) _z , where x, y, and z are each 20% in atomic%. x≤40, 20≤y≤30, 15≤z≤25 method for producing magnetic amorphous metal nanopowder.
The method according to claim 1,
The biphasic amorphous metal is represented by the formula Zr _p (Nd, Pr, Ce, La, Gd, Y) _{100- (p + q + r)} Al _q (Co, Ni) _r , wherein p, q, r is 5% p≤30, 5≤q≤15, 25≤r≤35 in atomic%, respectively.
The method according to claim 1,
The two-phase separated amorphous metal is represented by the formula Ni _s Nb _{50-s / 2} Y _{50-s / 2} , wherein s is 50≤s≤70 in atomic%, characterized in that the magnetic amorphous metal nanopowder manufacturing method .
The method according to claim 1,
The two-phase separated amorphous metal is represented by the formula [(Fe, Co) _i Si _j B _100-ij ] _k Cu _100-k , wherein i, j, k are atomic%, respectively 70 ≦ i ≦ 80, 5 ≤ j ≤ 15, 10 ≤ k ≤ 50, characterized in that the magnetic amorphous metal nano powder manufacturing method.
The method according to any one of claims 3 to 6,
In the fourth step, the method for selectively dissolving only the known phase is performed by immersing in HNO ₃ solution, characterized in that the magnetic amorphous metal nano powder manufacturing method.
The method of claim 7,
Magnetic amorphous metal nano powder manufacturing method, characterized in that the concentration of the HNO ₃ solution is 0.1M to 1M.
The method of claim 7,
Method for producing a magnetic amorphous metal nano powder, characterized in that for applying the ultrasonic wave in the fourth step is immersed in HNO ₃ solution.
The method of claim 7,
The fourth step is the magnetic amorphous metal nano powder manufacturing method, characterized in that the heating in the state immersed in HNO ₃ solution.
A magnetic amorphous metal nano powder prepared by one of the methods of claims 1 to 6,
The amorphous metal powder is composed of only a spherical precipitated phase of a two-phase separated amorphous metal containing elements showing magnetic properties at room temperature,
The spherical precipitated phase has a shell structure or a yard structure formed in a two phase separation process.
Magnetic amorphous metal nano powder, characterized in that it has a magnetic property by the compositional non-uniformity of the magnetic element located inside the amorphous metal powder.

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