CN111041279A - Ni-Mn-B alloy material with negative magnetization phenomenon and preparation method thereof - Google Patents
Ni-Mn-B alloy material with negative magnetization phenomenon and preparation method thereof Download PDFInfo
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- CN111041279A CN111041279A CN201911362777.1A CN201911362777A CN111041279A CN 111041279 A CN111041279 A CN 111041279A CN 201911362777 A CN201911362777 A CN 201911362777A CN 111041279 A CN111041279 A CN 111041279A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
- C22C1/058—Mixtures of metal powder with non-metallic powder by reaction sintering (i.e. gasless reaction starting from a mixture of solid metal compounds)
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/64—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent
- G11B5/65—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent characterised by its composition
- G11B5/653—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent characterised by its composition containing Fe or Ni
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Abstract
The invention discloses a Ni-Mn-B alloy material with a negative magnetization phenomenon and a preparation method thereof, relates to the technical field of magnetic material preparation, and discloses a Ni-Mn-B alloy material with a negative magnetization phenomenon, wherein the chemical formula of the Ni-Mn-B alloy material is Ni20Mn4‑xB5+xWherein x is more than or equal to 0 and less than or equal to 2 in atomic percentage; also discloses a preparation method of the Ni-Mn-B alloy material with negative magnetization phenomenon, which comprises the following steps: s100, according to Ni20Mn4‑xB5+xRespectively weighing Ni, Mn and B raw materials with the purity of not less than 99.9 percent according to the atomic percentage of the alloy; s200, smelting the raw materials to obtain a Ni-Mn-B sample; and S300, carrying out heat treatment on the sample. The realization of the magnetic moment flip of the Ni-Mn-B alloy material with the negative magnetization phenomenon can be realized only by changing the external magnetismThe magnitude of the field can be achieved without changing the direction of the applied magnetic field.
Description
Technical Field
The invention relates to the field of magnetic recording medium materials, in particular to a Ni-Mn-B alloy material with a negative magnetization phenomenon and a preparation method thereof.
Background
Magnetic recording materials refer to materials that utilize the magnetic properties of the material for the input, storage, and output of information, while magnetic recording materials are the portions of the material used to perform the storage and recording functions of information. With the development of the times, magnetic recording information storage devices are widely used in scientific research, medical treatment, military and daily life due to the advantages of high recording density, stability, reliability, repeated use and the like. The magnetic recording material stores information by responding the magnetic recording material to an external magnetic field to reach two reversible stable states, which correspond to "0" and "1" states in computer language respectively. In order to obtain the two reversible stable states, the two reversible stable states can be obtained only by regulating the magnitude of the magnetic field, which is generally realized by changing the direction of the external magnetic field to ensure that the magnetic moments of the material are aligned in opposite directions.
The phenomenon of negative magnetization, also called magnetization switching phenomenon, is defined as the phenomenon that the magnetic moment of a material crosses from positive to negative values with the decrease of temperature under the action of a positive external magnetic field, i.e. the magnetic moment of the material is switched, and the crossing temperature is defined as the compensation temperature. Therefore, those skilled in the art have made an effort to utilize this phenomenon to search for a material with negative magnetization, which can switch the magnetic moment of the material to two reversible stable states by changing the magnitude of the magnetic field in the vicinity of the compensation temperature while keeping the direction of the external magnetic field unchanged.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is to explore a material with negative magnetization, which can switch the magnetic moment of the material to two reversible stable states by changing the magnitude of the magnetic field while keeping the direction of the external magnetic field unchanged around the compensation temperature.
In order to achieve the above object, the present invention provides a Ni-Mn-B alloy material having a negative magnetization phenomenon, the alloy material having a chemical formula of Ni20Mn4-xB5+xThe alloy, wherein x is more than or equal to 0 and less than or equal to 2 in atomic percentage.
The invention also provides a preparation method of the Ni-Mn-B alloy material with the negative magnetization phenomenon, which comprises the following steps:
s100, according to Ni20Mn4-xB5+xRespectively weighing Ni, Mn and B raw materials with the purity of not less than 99.9 percent according to the atomic percentage of the alloy;
s200, smelting the raw materials to obtain a Ni-Mn-B sample;
s300, carrying out heat treatment on the sample.
Compared with the prior art, the invention has the technical advantages that:
(1) the realization of the magnetic moment overturning of the Ni-Mn-B alloy material with the negative magnetization phenomenon can be realized only by changing the magnitude of an external magnetic field without changing the direction of the external magnetic field;
(2) the external test environment of the Ni-Mn-B alloy material can be adjusted according to the specific application of the material to obtain the magnetization state required by application and finally obtain the sensitivity response required by application;
(3) the Ni-Mn-B alloy material with the negative magnetization phenomenon has wide application prospect, such as magnetic heads, giant magnetoresistance, spin valves, novel tunnel junction memories, sensors and the like.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a flow chart of a method for preparing a Ni-Mn-B alloy material according to a preferred embodiment of the invention;
FIG. 2 is an XRD pattern of a Ni-Mn-B alloy material prepared by a preferred embodiment of the invention at normal temperature;
FIG. 3 is a DC thermomagnetic curve of a Ni-Mn-B alloy material prepared by a preferred embodiment of the invention at 20 e;
FIG. 4 is a DC thermomagnetic curve of a Ni-Mn-B alloy material prepared by a preferred embodiment of the invention under 1000 e;
FIG. 5 is a diagram of the magnetic switching effect of the Ni-Mn-B alloy material prepared by the preferred embodiment of the present invention at 100K.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to fig. 1 to 5 of the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
The invention provides a Ni-Mn-B alloy material with negative magnetization phenomenon, wherein the chemical formula of the alloy material is Ni20Mn4-XB5+XAn alloy wherein x is in atomic percent0≤x≤2。
As shown in fig. 1, the present invention also provides a method for preparing a Ni-Mn-B alloy material according to a preferred embodiment, comprising the steps of:
s100, according to Ni20Mn4-xB5+xRespectively weighing Ni, Mn and B raw materials with the purity of not less than 99.9 percent according to the atomic percentage of the alloy;
s200, smelting the raw materials to obtain a Ni-Mn-B sample;
s300, carrying out heat treatment on the sample.
On one hand, the realization of the magnetic moment overturning of the Ni-Mn-B alloy material with the negative magnetization phenomenon can be realized only by changing the magnitude of an external magnetic field without changing the direction of the external magnetic field;
secondly, adjusting the external test environment of the Ni-Mn-B alloy material according to the specific application of the material to obtain the magnetization state required by application and finally obtain the sensitivity response required by application;
finally, the Ni-Mn-B alloy material with the negative magnetization phenomenon has wide application prospect, such as magnetic heads, giant magnetoresistance, spin valves, novel tunnel junction memories, sensors and the like.
In a preferred embodiment, the purity of Ni, Mn, B in step S100 is 99.95-99.98%.
In a preferred embodiment, step S200 further includes:
s201, sequentially putting the raw materials into a copper crucible of a non-consumable vacuum arc melting furnace, closing a cabin door of the melting furnace, and vacuumizing to 5 multiplied by 10-3Below Pa, introducing argon gas until the pressure in the furnace is 3.5X 104Pa。
In a preferred embodiment, step S200 further includes:
s202, setting the temperature of the smelting furnace to be 1500-1600 ℃, and repeatedly smelting for more than 4 times to enable the components of the Ni-Mn-B alloy material sample to be uniform.
In a preferred embodiment, step S300 further includes: wrapping the sample with a molybdenum sheet, preserving the heat at the temperature of 900-950 ℃ for 20-24h, and cooling the sample along with the furnace.
Example 1
S100, according to Ni20Mn4-xB5+xRespectively weighing Ni, Mn and B with the purity of not less than 99.9 percent according to the atomic percentage, preferably, the purity of the Ni, the purity of the Mn and the purity of the B are respectively between 99.95 percent and 99.98 percent, wherein the Ni, the Mn and the purity of the B are all solid blocks;
s200, putting the Ni, Mn and B weighed in the step S100 into a non-consumable vacuum arc melting furnace in sequence
In the copper crucible, the cabin door of the smelting furnace is closed and the vacuum is pumped to 5.0 multiplied by 10-3Introducing high-purity argon with the purity of not less than 99.9996 percent into the furnace under the pressure of 3.5 multiplied by 10 and below Pa4Pa, and then repeatedly smelting for more than 4 times when the temperature in the chamber rises to 1500 ℃ so as to ensure that the components of the Hastelloy alloy material sample are uniform;
s300, annealing the obtained sample at 900 ℃ for 14h, and then cooling the sample to room temperature along with the furnace to obtain the Ni-Mn-B alloy material.
Example 2
S100, according to Ni20Mn4-xB5+xRespectively weighing Ni, Mn and B with the purity of not less than 99.9 percent, preferably, the purity of the Ni, Mn and B is respectively 99.95 to 99.98 percentWherein Ni, Mn and B are all solid blocks;
s200, putting the Ni, Mn and B weighed in the step S100 into a copper crucible of a non-consumable vacuum arc melting furnace in sequence, closing a cabin door of the melting furnace, and vacuumizing to 5.0 multiplied by 10-3Introducing high-purity argon with the purity of not less than 99.9996 percent into the furnace under the pressure of 3.5 multiplied by 10 and below Pa4Pa, and then repeatedly smelting for more than 4 times when the temperature in the bin is raised to 1550 ℃ so as to ensure that the components of the Hastelloy alloy material sample are uniform;
s300, annealing the obtained sample at 920 ℃ for 13h, and then cooling the sample to room temperature along with the furnace to obtain the Ni-Mn-B alloy material.
Example 3
S100, according to Ni20Mn4-xB5+xRespectively weighing Ni, Mn and B with the purity of not less than 99.9 percent according to the atomic percentage, preferably, the purity of the Ni, the purity of the Mn and the purity of the B are respectively between 99.95 percent and 99.98 percent, wherein the Ni, the Mn and the purity of the B are all solid blocks;
s200, putting the Ni, Mn and B weighed in the step S100 into a copper crucible of a non-consumable vacuum arc melting furnace in sequence, closing a cabin door of the melting furnace, and vacuumizing to 5.0 multiplied by 10-3Introducing high-purity argon with the purity of not less than 99.9996 percent into the furnace under the pressure of 3.5 multiplied by 10 and below Pa4Pa, and then repeatedly smelting for more than 4 times when the temperature in the bin is raised to 1600 ℃ so as to ensure that the components of the Hastelloy alloy material sample are uniform;
s300, annealing the obtained sample at 920 ℃ for 12h, and then cooling the sample to room temperature along with the furnace to obtain the Ni-Mn-B alloy material.
After preparing the Ni-Mn-B alloy material, the applicant performs the following characterization experiments:
normal temperature XRD pattern of sample:
the material prepared by the above method was first tested. Specifically, the sample was ground into a powder having a uniform size, and then an ordinary temperature XRD pattern was measured using a Bruker D8X-ray diffractometer, and the results were shown in fig. 2. It can be seen from FIG. 2 that the sample is Ni at ordinary temperature20Mn3B6The single-phase structure of (2) is a cubic structure without the presence of the second phase.
Dc thermomagnetic curve of the test sample at 2 Oe:
the material prepared by the above method was first tested. Specifically, an MPMS-3 SQUID-VSM magnetometer developed and produced by Quantum Design company in the United states is adopted, and a sample is placed into a test rod and then is vacuumized. The temperature in the test bar was raised to 400K, then lowered to 10K at a cooling rate of 35K/min in a 0T cooling field, then the temperature was measured at 2 Oe to 400K, the temperature was measured at 10K, and finally the temperature was measured at 400K to obtain the curve shown in FIG. 3. As shown in FIG. 3, the FH and FC curves of the M-T DC thermomagnetic curve exhibit significant negative magnetization below 135K.
Dc thermomagnetic curve of the test sample at 100 Oe:
firstly, the required sample material is prepared by adopting the method and then the sample test is carried out. Specifically, an MPMS-3 SQUID-VSM magnetometer developed and produced by Quantum Design company in the United states is adopted, and a sample is placed into a test rod and then is vacuumized. The temperature in the test bar was raised to 400K, then lowered to 10K at a cooling rate of 35K/min in a 0T cooling field, then measured at 400K at 100Oe, measured at 10K at lowered temperature, and finally measured at 400K at raised temperature to obtain the curve shown in FIG. 4. As shown in FIG. 4, only the FH curve below the 100K attachment exhibits a weak negative magnetization in the M-T DC thermomagnetic curve.
The samples were tested for magnetic switching effect at 100K:
firstly, the required sample material is prepared by adopting the method and then the sample test is carried out. Specifically, an MPMS-3 SQUID-VSM magnetometer developed and produced by Quantum Design company in the United states is adopted, and a sample is placed into a test rod and then is vacuumized. And (3) raising the temperature in the test rod to 400K, then reducing the temperature to 10K at a cooling rate of 35K/min under a cooling field of 100e, then raising the temperature to 100K under 100e, keeping for a period of time and measuring the magnetic moment of the test rod, increasing the field to 600e, keeping for a period of time and measuring the magnetic moment of the test rod, and repeatedly circulating for several times to obtain the curve shown in FIG. 5. As shown in fig. 5, the material magnetic moment can be switched to two reversible stable states by changing the magnitude of the external magnetic field only while keeping the direction of the external magnetic field unchanged.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (6)
1. A Ni-Mn-B alloy material with negative magnetization phenomenon has a chemical formula of Ni20Mn4-xB5+xWherein x is more than or equal to 0 and less than or equal to 2 in atomic percentage.
2. A method for preparing a Ni-Mn-B alloy material having a negative magnetization phenomenon according to claim 1, preferably, the method comprises the steps of:
s100, according to Ni20Mn4-xB5+xRespectively weighing Ni, Mn and B raw materials with the purity of not less than 99.9 percent according to the atomic percentage of the alloy;
s200, smelting the raw materials to obtain a Ni-Mn-B sample;
s300, carrying out heat treatment on the sample.
3. The method according to claim 2, wherein the purity of Ni, Mn, B in step S100 is 99.95-99.98%.
4. The method of claim 2, wherein step S200 further comprises:
s201, sequentially putting the raw materials into a copper crucible of a non-consumable vacuum arc melting furnace, closing a cabin door of the melting furnace, and vacuumizing to 5 multiplied by 10-3Below Pa, introducing argon gas until the pressure in the furnace is 3.5X 104Pa。
5. The method of claim 4, wherein step S200 further comprises:
s202, setting the temperature of the smelting furnace to be 1500-1600 ℃, and repeatedly smelting for more than 4 times to enable the components of the Ni-Mn-B alloy material sample to be uniform.
6. The method of claim 2, wherein step S300 further comprises: wrapping the sample with a molybdenum sheet, preserving the heat at the temperature of 900-950 ℃ for 20-24h, and cooling the sample along with the furnace.
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Application publication date: 20200421 |