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Method for regulating exchange bias field of intermetallic compound

A technology of intermetallic compounds and bias fields, applied in the fields of magnetic field controlled resistors, manufacturing/processing of electromagnetic devices, etc., to achieve the effects of expanding the scope of use, increasing stability, and enriching design methods

Active Publication Date: 2019-06-11
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There is currently no prior art disclosure of Mn 3 Zn 1-x co x Exchange Bias Properties of N Intermetallic Compounds

Method used

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  • Method for regulating exchange bias field of intermetallic compound
  • Method for regulating exchange bias field of intermetallic compound
  • Method for regulating exchange bias field of intermetallic compound

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0049] Example 1, Mn 3 Zn 1-x co x The preparation method and temperature of N and the ratio of zinc and cobalt to Mn 3 Zn 1-x co x Effect of N exchange bias field

[0050] 1. Mn 3 Zn 1-x co x The preparation method of N, its synthetic steps are as follows:

[0051] (1) Preparation of Mn 3 Zn 1-x co x The raw materials of N intermetallic compounds are Mn powder, Zn powder and Co powder with a purity of 99.99% respectively;

[0052] (2) Take quantitative Mn powder and put it into a quartz boat, and carry out nitriding treatment in a chemical vapor deposition furnace; clean the chemical vapor deposition quartz tube with 99.99% nitrogen of purity three times, then heat up to 730°C, keep warm for 2700 minutes, then furnace cool to room temperature. The nitrogen flow rate has been kept at 80ml / min during heating, heat preservation and cooling, and the Mn 2 N;

[0053] 4Mn+N 2 →2Mn 2 N

[0054] (3) Weigh Mn according to molar ratio 2 N powder, Zn powder and Co pow...

Embodiment 2

[0087] Example 2, Mn 3 Zn 1-x co x The preparation method and temperature of N and the ratio of zinc and cobalt to Mn 3 Zn 1-x co x Effect of N exchange bias field

[0088] 1. Mn 3 Zn 1-x co x The preparation method of N, its synthetic steps are as follows:

[0089] (1) Preparation of Mn 3 Zn 1-x co x The raw materials of N intermetallic compounds are Mn powder, Zn powder and Co powder with a purity of 99.99% respectively;

[0090] (2) Take quantitative Mn powder and put it into a quartz boat, and carry out nitriding treatment in a chemical vapor deposition furnace; clean the chemical vapor deposition quartz tube with 99.99% nitrogen of purity three times, then heat up to 780°C, heat preservation for 2700 minutes, then furnace cooled to room temperature. The nitrogen flow rate has been kept at 80ml / min during heating, heat preservation and cooling, and the Mn 2 N;

[0091] 4Mn+N 2 →2Mn 2 N

[0092] (3) Weigh Mn according to molar ratio 2 N powder, Zn powder ...

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Abstract

The invention discloses a method for regulating an exchange bias field of an intermetallic compound. The method for regulating the exchange bias field of the intermetallic compound Mn3Zn1-xCoxN provided by the invention comprises the following steps: the x value of the intermetallic compound Mn3Zn1-xCoxN is adjusted within a range that x is greater than or equal to 0.5 and less than or equal to 0.9, and the intermetallic compound Mn3Zn1-xCoxN with different x values is prepared; and / or the prepared intermetallic compound Mn3Zn1-xCoxN is cooled at the room temperature and under an external 5T magnetic field to 5-65K, and the intermetallic compound Mn3Zn1-xCoxN can generate exchange bias fields of different values. In the method disclosed in the invention, when x is equal to 0.9, and when the temperature is within the range of 5-65K, the exchange bias field can reach rare 11.02-13.3kOe, and the exchange bias field is reduced along with the increase of the temperature in the temperature range; and it is expected that the crystal can be applied to the application needing to adjust the exchange bias field by adjusting the temperature, such as the fields of information storage, magneticfield detection, magnetic fingerprint identification and the like.

Description

technical field [0001] The invention relates to the field of magnetoelectronic devices, in particular to a method for adjusting the exchange bias field of an intermetallic compound. Background technique [0002] The exchange bias effect originates from the exchange coupling effect at the interface of different magnetic phases of the material. Driven by this effect, the center of the hysteresis loop of the material deviates from the zero point of the magnetic field. The offset is called the exchange bias place. The exchange bias field is an interface effect, and its magnitude depends strongly on the interface spin configuration, anisotropy, antiferromagnetic spin orientation, cooling field, interface roughness and other factors that will affect the exchange bias field. The exchange bias field of ferromagnetic / antiferromagnetic system has rich physical significance and has important application value in giant magnetoresistance devices. The exchange bias effect is an importan...

Claims

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Application Information

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IPC IPC(8): H01L43/08H01L43/12
Inventor 褚立华丁磊李旭晨刘卓海李美成
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)