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Magnetic composite organic nanometer granule film with magnetoresistance effect and preparation method thereof

A nanoparticle and magnetoresistance technology, which is applied in the fields of magnetic field controlled resistors, the application of magnetic films to substrates, magnetic layers, etc., can solve the problems of high cost and complicated preparation process, and achieve material simplification, broad application prospects, The effect of cost reduction

Inactive Publication Date: 2009-01-28
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the functional devices prepared by using this inorganic system structure have a large giant magnetoresistance effect, the preparation process is relatively complicated and the cost is relatively high.

Method used

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  • Magnetic composite organic nanometer granule film with magnetoresistance effect and preparation method thereof
  • Magnetic composite organic nanometer granule film with magnetoresistance effect and preparation method thereof
  • Magnetic composite organic nanometer granule film with magnetoresistance effect and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Co / Alq 3 Preparation of nanoparticle films:

[0023] a. The substrate used for deposition is a glass slide, which is cleaned and dried, and placed in a vacuum chamber.

[0024] b. Use a mechanical pump and a molecular pump to pump the vacuum chamber to a higher vacuum, about 5×10 -4 Pa.

[0025] c. Two evaporation sources are arranged at the bottom of the vacuum chamber—an organic semiconductor source and a magnetic metal material source. The film formation process is controlled by adjusting the heating voltage and temperature, as well as the real-time monitoring of the film thickness meter. The evaporation rate of the magnetic metal is controlled at Between , the rate of the organic material is controlled at Between, and through their relative velocity to control the film composition.

[0026] d. Using the physical property testing system (PPMS) to test the magnetoresistance of the sample, it is found that the magnetic composite organic nanoparticle film increa...

Embodiment 2

[0031] Preparation of Co / TPD nanoparticle film:

[0032] a. The substrate used for deposition is a glass slide, which is cleaned and dried, and placed in a vacuum chamber.

[0033] b. Use a mechanical pump and a molecular pump to pump the vacuum chamber to a higher vacuum, about 5×10 -4 Pa.

[0034] c. There are two evaporation sources at the bottom of the vacuum chamber—organic source and metal source. The film formation process is controlled by adjusting the heating voltage and temperature, as well as the real-time monitoring of the film thickness meter. The evaporation rate of the magnetic metal is controlled at Between , the rate of the organic material is controlled at Between, and through their relative velocity to control the film composition.

[0035] d. The magnetoresistance test was carried out on the sample by using a physical property testing system (PPMS), and the giant magnetoresistance effect reached -1.1% (T=4.2K) in the sample with x=0.28.

[0036] e. ...

Embodiment 3

[0039] Fe / Alq 3 Preparation of nanoparticle films:

[0040] a. The substrate used for deposition is a glass slide, which is cleaned and dried, and placed in a vacuum chamber.

[0041] b. Use a mechanical pump and a molecular pump to pump the vacuum chamber to a higher vacuum, about 5×10 -4 Pa.

[0042] c. There are two evaporation sources at the bottom of the vacuum chamber—organic source and metal source. The film formation process is controlled by adjusting the heating voltage and temperature, as well as the real-time monitoring of the film thickness meter. The evaporation rate of the magnetic metal is controlled at Between , the rate of the organic material is controlled at Between, and through their relative velocity to control the film composition.

[0043] d. The magnetoresistance test was carried out on the sample by using a physical property testing system (PPMS), and the giant magnetoresistance effect reached -0.13% (T=30K) in the sample with x=0.56.

[0044]...

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Abstract

The invention belongs to the technical field of a magnetic film material, in particular to a magnetic composite organic nanometer granular film with giant magnetic resistance effect and a method for preparing the same. The film material is prepared and obtained from a magnetic metal material and an organic semiconductor material by a co-evaporation method; the nanometer granules of the magnetic metal material are evenly embedded in an organic semiconductor substrate and expressed as: (A)x(B)1-x, x is more than 0.28 and less than 0.56, wherein A is the magnetic metal material; and B is the organic semiconductor material. The film material can be widely used for a magnetic sensor, a magnetic memory, a temperature sensor and other element devices.

Description

technical field [0001] The invention belongs to the technical field of magnetic thin films, and in particular relates to a metal-organic semiconductor composite granular film and a preparation method thereof. Background technique [0002] The giant magnetoresistance effect has been widely used in the field of magnetic sensors and magnetic storage. However, the most widely used is the magnetic multilayer film structure (spin valve) and granular film structure based on inorganic systems. Although the functional device prepared by using this inorganic system structure has a large giant magnetoresistance effect, its preparation process is relatively complicated and the cost is relatively high. [0003] At the same time, due to the unique advantages of organic materials compared with inorganic materials in terms of physical and chemical properties and preparation processes, organic materials have begun to receive widespread attention in the academic community. Based on the abov...

Claims

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Application Information

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IPC IPC(8): H01F10/10H01F41/20H01L43/08H01L43/10
Inventor 倪刚盛鹏赵晓萌树奇殷建芳吴俊奇
Owner FUDAN UNIV
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