A preparation method of la0.7ca0.25sr0.05mno3 ferromagnetic film

Abstract

The invention relates to a preparation method of a thin film material, and more specifically relates to a preparation method of a La0.7Ca0.25Sr0.05MnO3 ferromagnetic thin film. The preparation method comprises following steps: 1, lanthanum nitrate is added into a mixed solution of glacial acetic acid and ethylene glycol monomethyl ether so as to obtain a solution A; 2, a mixture of calcium acetate and strontium nitrate is added into the mixed solution of glacial acetic acid and ethylene glycol monomethyl ether so as to obtain a solution B; 3, manganese acetate is added into the solution B so as to obtain a solution C; 4, the solution A is mixed with the solution C, and 1 to 10ml of acetic acid is added so as to obtain a La0.7Ca0.25Sr0.05MnO3 solution; 5, a substrate is subjected to ultrasonic processing in acetone and absolute ethyl alcohol successively; 6, the La0.7Ca0.25Sr0.05MnO3 solution is added onto the processed substrate dropwise for spin coating so as to obtain a thin film D; 7, the thin film D is subjected to presintering so as to obtain a thin film E; 8, the thin film E is delivered into a rapid heat treatment furnace for roasting, and is cooled with the rapid heat treatment furnace to room temperature so as to obtain the La0.7Ca0.25Sr0.05MnO3 ferromagnetic thin film. The preparation method is capable of solving problems of existing technology used for preparing the La0.7Ca0.25Sr0.05MnO3 (LCSMO) ferromagnetic thin film that performance is poor, purity is low, density is low, and sintering temperature is too high in preparation processes. The LCSMO ferromagnetic thin film with uniform film thickness and excellent magnetocaloric effects is prepared via modified sol-gel method.

Description

technical field [0001] The present invention relates to a kind of preparation method of film material, specifically a kind of La 0.7 Ca 0.25 Sr 0.05 MnO 3 Preparation method of ferromagnetic thin film. Background technique [0002] Rare earth manganese oxide LaAEMnO 3 (AE is a doping element, such as Ca, Sr, etc.) Due to its potential application prospects in magnetic sensors, magnetic memories, and magnetic refrigeration, it has received great attention from domestic and foreign scientific research institutions. The carrier spin of manganese oxide The polarizability is extremely high, and it shows a large magnetoresistance effect and magnetic card effect near the Curie temperature, so it has potential application prospects in spintronics. At the same time, since the miniaturization and miniaturization of devices is the development trend in the field of electronics and information, the research on the preparation and application of rare earth manganese oxide ferromagnet...

AI Technical Summary

Problems solved by technology

[0004] The purpose of this invention is to provide a kind of La 0.7 Ca 0.25 Sr 0.05 MnO 3 The preparation method of ferromagnetic thin film, this method solves prior art and prepares La 0.7 Ca 0.25 Sr 0.05 MnO 3 (LCSMO) thin film has poor ferromagnetic properties, low purity, low density and high sintering temperature in the preparation process. By improving the process of the sol-gel method, a manganese oxide with uniform film thickness and excellent magnetic card effect was prepared. Ferromagnetic film

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