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Method for preparing rare-earth-element-doped lanthanum-strontium-manganese-oxygen-system manganite magnetic resistance materials

A technology of lanthanum strontium manganese oxide series manganite and rare earth elements, which is applied in the field of preparation of magnetoresistive materials, can solve problems such as low magnetic field sensitivity, achieve high magnetic field sensitivity, optimize preparation process, and improve low-field magnetoresistance effect. Effect

Inactive Publication Date: 2014-10-08
HARBIN UNIV OF SCI & TECH
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  • Claims
  • Application Information

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Problems solved by technology

The main technical problems at present are: 1. The sensitivity of the magnetic field is low, that is, the external magnetic field required to produce the magnetoresistance effect is relatively high, generally several tesla; 2. The magnetoresistance effect only occurs near the metal-insulator transition temperature. Within a narrow temperature range

Method used

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  • Method for preparing rare-earth-element-doped lanthanum-strontium-manganese-oxygen-system manganite magnetic resistance materials
  • Method for preparing rare-earth-element-doped lanthanum-strontium-manganese-oxygen-system manganite magnetic resistance materials
  • Method for preparing rare-earth-element-doped lanthanum-strontium-manganese-oxygen-system manganite magnetic resistance materials

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specific Embodiment approach 1

[0031] Specific Embodiment 1: This embodiment is a preparation method of a lanthanum strontium manganese oxide manganite magnetoresistance material doped with rare earth elements according to the following steps:

[0032] 1. Weigh the raw materials: La 2 o 3 Burning under the condition of 300℃~400℃ for 3h~4h, the dried La 2 o 3 ; According to the chemical formula La 0.7-x A x Sr 0.3 MnO 3 The stoichiometric ratio of the metal elements in the MnO 2 , SrCO 3 , oxides of metal element A and dry La 2 o 3 ; The oxide of the metal element A is CeO 2 , Y 2 o 3 or Er 2 o 3 ; The chemical formula La 0.7-x A x Sr 0.3 MnO 3 x in is 0.1 or 0.2;

[0033] 2. Calcination: the MnO weighed in step 1 2 , SrCO 3 , oxides of metal element A and dry La 2 o 3After mixing, use an agate mortar and grind for 5 minutes to 10 minutes to obtain a uniform mixed powder. Pre-fire the uniform mixed powder at a temperature of 800 ° C to 900 ° C for 8 hours to 10 hours, cool naturally to...

specific Embodiment approach 2

[0037] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in step one, La 2 o 3 Burning at 400°C for 4 hours to obtain dry La 2 o 3 . Others are the same as in the first embodiment.

specific Embodiment approach 3

[0038] Specific embodiment three: the difference between this embodiment and one of the specific embodiments one or two is: the MnO weighed in step one in step two 2 , SrCO 3 , oxides of metal element A and dry La 2 o 3 After mixing, grind with an agate mortar for 10 minutes to obtain a uniform mixed powder, pre-calcine the uniform mixed powder at a temperature of 900° C. for 10 hours, and cool naturally to room temperature. Others are the same as those in the first or second embodiment.

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Abstract

The invention discloses a method for preparing rare-earth-element-doped lanthanum-strontium-manganese-oxygen-system manganite magnetic resistance materials, and relates to a preparing method of the magnetic resistance materials. The method aims at solving the technical problems that the magnetic field sensitivity of materials substituted by current lanthanum-strontium-manganese-oxygen-system manganite magnetic resistance materials at the La position in a doped mode is low, namely an external magnetic field needing to be added for generating the magnetic resistance effect is high, the adding number is normally several Tesla, and the magnetic resistance effect only occurs within a narrow warm area scope nearby the metal-insulator transformation temperature. The method includes the steps of (1) weighing raw materials, and (2) burning the raw materials. By means of the method, the prepared magnetic resistance materials are high in magnetic field sensitivity, and the magnetic resistance effect can be generated when the magnetic field is low; compared with an existing La-position doped substitution LaSrMnO system, the magnetic field is reduced by one magnitude order; the magnetic resistance effect of the magnetic resistance materials can occur in the warm area scope with the wide metal-insulator transformation temperature. The method is applied to magnetic resistance material preparing.

Description

technical field [0001] The invention relates to a preparation method of a magnetoresistance material. Background technique [0002] ABOs 3 Rare-earth manganese oxide doped with perovskite structure has attracted much attention due to its giant magnetoresistance effect and its rich physical connotation, and has become a research hotspot in the fields of condensed matter physics and materials physics. This kind of magnetoresistive material has broad application prospects in magnetic memory, magnetic refrigeration device, magneto-sensitive detection element, high-density read head and magnetic sensor. [0003] by ABO 3 The LaCaMnO system and the LaSrMnO system are derived through the doping substitution of the A site and the B site. At present, the research in this field mainly focuses on the doping substitution of La site, Ca site, Sr site and Mn site. By adjusting the molar ratio of different elements and optimizing the preparation process, the magnetoresistance properties...

Claims

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Application Information

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IPC IPC(8): H01L43/12H01L43/10H01F1/00C04B35/50C04B35/622
Inventor 张光宇赵鹏飞杨哲徐芮高敏张成龙
Owner HARBIN UNIV OF SCI & TECH
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