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A ferromagnetic LSMO film and a preparation method thereof

A thin film and magnetic technology, applied in the direction of magnetic thin film, magnetic film to substrate application, magnetic objects, etc., can solve the problems of incomplete volatilization of organic solvents, poor film crystal quality, high annealing temperature, etc., to improve film quality and increase The effect of density and low temperature

Active Publication Date: 2019-01-25
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the La prepared by the existing preparation method 0.7 Sr 0.3 MnO 3 The film has more pores, and the crystal quality of the film is poor, which is caused by the high annealing temperature and incomplete annealing, which leads to the incomplete volatilization of the organic solvent in the film.

Method used

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  • A ferromagnetic LSMO film and a preparation method thereof
  • A ferromagnetic LSMO film and a preparation method thereof
  • A ferromagnetic LSMO film and a preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Step 1: La(NO 3 ) 3 ·6H 2 O, Sr(NO 3 ) 2 and C 4 h 6 MnO 4 4H 2 O is dissolved in ethylene glycol methyl ether at a molar ratio of 0.7:0.3:1 and stirred for 30 minutes, then added deionized water and stirred until completely dissolved, then added acetic anhydride and stirred for 90 minutes, and stood to obtain La 0.7 Sr 0.3 MnO 3 Precursor, La 0.7 Sr 0.3 MnO 3 The concentration of metal ions in the precursor solution is 0.3mol / L, and the volume ratio of ethylene glycol methyl ether and acetic anhydride is 3:1.1;

[0044] Step 2: Let the precursor solution stand for 12 hours, and spin-coat La on the FTO / Glass substrate by spin coating 0.7 Sr 0.3 MnO 3 Precursor, get La 0.7 Sr 0.3 MnO 3 Wet film, the wet film is uniformly glued and then baked at 160°C for 8 minutes to obtain a dry film. When the temperature is raised to 400°C at a heating rate of 20°C / min, pre-annealing is performed for 20 minutes, and then the temperature is raised at a heating rate of ...

Embodiment 2

[0047] Step 1: La(NO 3 ) 3 ·6H 2 O, Sr(NO 3 ) 2 and C 4 h 6 MnO 4 4H 2 O is dissolved in ethylene glycol methyl ether at a molar ratio of 0.7:0.3:1 and stirred for 30 minutes, then added deionized water and stirred until completely dissolved, then added acetic anhydride and stirred for 90 minutes, and stood to obtain La 0.7 Sr 0.3 MnO 3 Precursor, La 0.7 Sr 0.3 MnO 3 The concentration of metal ions in the precursor solution is 0.3mol / L, and the volume ratio of ethylene glycol methyl ether and acetic anhydride is 3:1.1;

[0048] Step 2: Let the precursor solution stand for 12 hours, and spin-coat La on the FTO / Glass substrate by spin coating 0.7 Sr 0.3 MnO 3 Precursor, get La 0.7 Sr 0.3 MnO 3 Wet film, the wet film is uniformly glued and then baked at 160°C for 8 minutes to obtain a dry film. When the temperature is raised to 400°C at a heating rate of 10°C / min, pre-annealing is performed for 20 minutes, and then the temperature is raised at a heating rate of ...

Embodiment 3

[0051] Step 1: La(NO 3 ) 3 ·6H 2 O, Sr(NO 3 ) 2 and C 4 h 6 MnO 4 4H 2 O was dissolved in ethylene glycol methyl ether at a molar ratio of 0.7:0.3:1 and stirred for 30 minutes, then added deionized water and stirred until completely dissolved, then added acetic anhydride and stirred for 90 minutes, and added dropwise polyethylene glycol and stirred evenly, statically La 0.7 Sr 0.3 MnO 3 Precursor, La 0.7 Sr 0.3 MnO 3 The concentration of metal ions in the precursor solution is 0.3mol / L, the volume ratio of ethylene glycol methyl ether and acetic anhydride is 3:1.1; the volume ratio of polyethylene glycol and acetic anhydride is 0.25:1;

[0052] Step 2: Let the precursor solution stand for 12 hours, and spin-coat La on the FTO / Glass substrate by spin coating 0.7 Sr 0.3 MnO 3 Precursor, get La 0.7 Sr 0.3 MnO 3 Wet film, the wet film is uniformly glued and then baked at 160°C for 8 minutes to obtain a dry film. When the temperature is raised to 400°C at a heati...

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Abstract

The invention provides a LSMO thin film with high ferromagnetism and a preparation method thereof. A La0. 7Sr0. 3MnO3 wet film is prepare by a gel spin coating method, La_ (0.7) Sr_ (0.3) MnO_3 thin films were prepared by pre-annealing at the heating rate of 10 -20 DEG C / min to 350 -400DEG C and then annealing at 600 -620 DEG C at the heating rate of 10 -20 DEG C / min. The La_ (0.7) Sr_ (0.3) MnO_3 thin films are rhombohedral perovskite structure, space group R_3c, grown along (101) direction, and the saturation magnetization Ms is 160.12 emu / cm3. The results show that the La_ (0.7) Sr_ (0.3)MnO_3 thin films have a high saturation magnetization. The preparation method of the invention increases the pre-annealing process, which is beneficial to the volatilization of organic solvent and improves the ferromagnetism of the thin film; Adding polyethylene glycol can adjust the viscosity of the precursor and improve the quality of the film.

Description

technical field [0001] The invention belongs to the field of functional materials, and in particular relates to a high ferromagnetic LSMO thin film and a preparation method thereof. Background technique [0002] In recent years, doped rare earth manganese oxide Re 1-x A x MnO 3 (Re = rare earth elements such as La, Pr, etc., A = divalent metal elements such as Ca, Sr, Ba) due to its unique magnetic and electrical properties, such as colossal magnetoresistance effect (CMR), phase separation, spin / charge Orbit / track order and so on have been extensively studied. Manganese oxide La with perovskite structure 0.7 Sr 0.3 MnO 3 (abbreviated LSMO) thin film because of its semi-metallic properties, high Curie temperature (T C =369K) and the phase transition process caused by the competition between its characteristic ferromagnetic and antiferromagnetic phases has aroused high interest. The physical properties exhibited by such materials not only challenge the research of many...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/24H01F41/22H01F10/193C01F17/00
CPCC01P2006/42C01F17/32H01F10/193H01F41/22H01F41/24
Inventor 谈国强刘云郭美佑薛敏涛任慧君夏傲
Owner SHAANXI UNIV OF SCI & TECH
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