Ferrimagnetic semimetal and preparation method thereof

A ferrimagnetic, semi-metallic technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of low efficiency of spin polarized electrons and low efficiency of spin electrons

Active Publication Date: 2020-08-25
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been theoretically demonstrated that the efficiency of injecting spin-polarized electrons from a ferromagnetic material with a lower resistivity to a semiconductor material with a higher resistivity is less than 2%
Resistivity mismatch and low spintronic polarizability of ferromagnetic metals are direct causes of low spintronic injection efficiency

Method used

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  • Ferrimagnetic semimetal and preparation method thereof
  • Ferrimagnetic semimetal and preparation method thereof
  • Ferrimagnetic semimetal and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] La with a purity higher than 99.9% 2 O 3 , Fe 2 O 3 , Re 2 O 7 , CuO and Re powder were mixed at a molar ratio of 7:21:9:42:10, and ground in an argon-filled glove box for 2 hours to obtain a mixture with a particle size of 200 mesh. The mixture was filled and sealed in gold capsules with a wall thickness of 0.1 mm. The gold capsules are placed in a six-sided top press, and under the conditions of a pressure of 8 GPa and a temperature of 1000° C., the raw materials in the gold capsules are reacted for 30 minutes to obtain a reaction product. After cooling to room temperature within 15 seconds, the pressure was slowly released, and finally the reaction product was taken out from the gold capsule to obtain LaCu 3 Fe 2 Re 2 O 12 .

[0040] Performance measurement

[0041] 1.XRD test

[0042] The structure of the semimetal was characterized by an X-ray diffractometer produced by Huber, Germany. Among them, the target material generated by X-ray is a copper ta...

Embodiment 2

[0057] La with a purity higher than 99.9% 2 O 3 , Fe 2 O 3 , Re 2 O 7 , CuO and Re powder were mixed in a molar ratio of 7:21:9:42:10, and ground in an argon-filled glove box for 30 minutes to obtain a mixture with a particle size of 1000 mesh. The mixture was filled and sealed in platinum capsules with a wall thickness of 1 mm. The platinum capsules are placed in a 6-8 type two-stage propelling press, and the raw materials in the gold capsules are reacted for 40 minutes under the conditions of a pressure of 10 GPa and a temperature of 1100° C. to obtain a reaction product. It took 2 hours, and after the temperature dropped to room temperature, the pressure was slowly released, and finally the reaction product was taken out from the gold capsule to obtain LaCu 3 Fe 2 Re 2 O 12 .

[0058] The ferrimagnetic semi-metal LaCu prepared in this example 3 Fe 2 Re 2 O 12 The structure and performance are the same as those in Example 1.

Embodiment 3

[0060] La with a purity higher than 99.9% 2 O 3 , Fe 2 O 3 , Re 2 O 7 , CuO and Re powder were mixed at a molar ratio of 7:21:9:42:10, and ground in an argon-filled glove box for 1 hour to obtain a mixture with a particle size of 500 mesh. The mixture was filled and sealed in gold capsules with a wall thickness of 0.5 mm. The gold capsules are placed in a six-sided top press, and under the conditions of a pressure of 9 GPa and a temperature of 1050° C., the raw materials in the gold capsules are reacted for 60 minutes to obtain a reaction product. It took 10 hours, after the temperature dropped to room temperature, the pressure was slowly released, and finally the reaction product was taken out from the gold capsule to obtain LaCu 3 Fe 2 Re 2 O 12 .

[0061] The ferrimagnetic semi-metal LaCu prepared in this example 3 Fe 2 Re 2 O 12 The structure and performance are the same as those in Example 1.

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Abstract

The invention provides a ferrimagnetism semimetal. The chemical formula of the ferrimagnetism semimetal is LaCu3Fe2Re2O12. The invention also provides a method for preparing the ferrimagnetic semimetal. The method comprises the following steps: (1), grinding and mixing La2O3, Fe2O3, Re2O7, CuO and Re powder in a protective gas environment according to a molar ratio of 7: 21: 9: 42: 10 to obtain amixture; (2), sealing and wrapping the mixture, and carrying out synthesizing; and (3), cooling the synthetic product to room temperature, and relieving the pressure to obtain the ferromagnetic semimetal LaCu3Fe2Re2O12. The ferromagnetic semimetal LaCu3Fe2Re2O12 provided by the invention has high Curie temperature (Tc-620K), wide band gap (-2.3 eV) and large low-field magnetic resistance (about 4%at 2K and 0.8 T), and has potential application value in future spinning electronic devices.

Description

technical field [0001] The invention belongs to the field of material synthesis. Specifically, the present invention relates to a ferrimagnetic semi-metal and a preparation method thereof. Background technique [0002] The present and future is an information-led society, and the processing, transmission and storage of information will require unprecedented scale and speed. Semi-metallic materials of large-scale integrated circuits and high-frequency devices play an important role in information processing and transmission, in which they make great use of the charge properties of electrons; while information storage in information technology (such as magnetic tapes) , optical discs, hard disks, etc.) are made of magnetic materials, which mainly use the spin properties of electrons. [0003] However, up to now, the research and application of electron charge and spin properties have been basically developed independently of each other. If the charge and spin properties of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C04B35/626C04B35/645C04B35/65H01F1/40H01F41/02
CPCC04B35/01C04B35/6261C04B35/645C04B35/65C04B2235/3227C04B2235/3272C04B2235/3281C04B2235/96H01F1/408H01F41/02
Inventor 龙有文刘哲宏
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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