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Preparation and properties of barium ferrite thin films of the sol-gel - based

Author: TangHao
Tutor: ZhangWanLi
School: University of Electronic Science and Technology
Course: Materials Science and Engineering
Keywords: Barium ferrite thin films Texture Complexing agent Sol-gel
CLC: TM277
Type: Master's thesis
Year: 2010
Downloads: 49
Quote: 1
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Abstract


M-type hexagonal barium ferrite (BaM) has stable chemical properties, low loss, high magnetocrystalline anisotropy and spin magnetic characteristics in the field of magnetic recording and microwave communication has important applications. This article configuration ferric hydroxide, citric acid, EDTA the three sol system using the sol-gel method barium ferrite thin films. Major study sol system in iron barium ion ratio, heat treatment temperature and heat treatment time of barium ferrite thin texture, surface morphology and magnetic properties. The experimental results show that for all these three systems sol having a C-axis texture of the BAM film. Iron, barium atomic ratio 3,5,10.5,11 and BAM 13.5 ferric hydroxide sol system are able to obtain the C-axis orientation film. Iron, barium atomic ratio of 10.5 BAM film C-axis texture best. At 1000 ℃ after heat treatment 3 hours, to obtain a good C-axis orientation, the film grain C-axis perpendicular to the film plane, and the thin film [110] direction of the substrate [100] direction is parallel. The film appeared on the surface morphology of tabular grains with rod-like grains mixed. The film having a magnetic anisotropy in the plane direction than in the in-plane easy magnetization. Increasing heat treatment time, the outer surface saturation magnetization increased coercivity first increases and then decreases. At 1000 ℃, the heat treatment time increased from 1 hour to 4 hours, the saturation magnetization from 282.2 Gs increased 328.5 GS, the coercive force from 1459.85 Oe reduced increased to 4019.6 Oe to 2900 Oe, and finally reduced to 1567.3 Oe . With increasing film thickness of the film C-axis orientation is deteriorated, and the coercive force is increased, when the film thickness increased 1.05μm grains completely random orientation, the remanence ratio of less than 0.4, the coercive force close to 4 kOe. Citric Acid, the sol preparation of barium ferrite films, the film surface to the rod-like grains. Increase of the citric acid content, the film is C-axis texture deteriorates, rod-like particles increased, resulting in-plane coercive force is also a corresponding increase. Compared with the ferric hydroxide system, require a higher heat treatment temperature is a good orientation of the C axis. Experimental results show that at 1100 ℃, 3 hours after the heat treatment, to obtain a relatively good texture. Remanence ratio of about 0.55, the coercivity of 3.6 kOe. The preferred sol of the present experiment system as EDTA, their preparation BAM film has a perfect C-axis texture, the surface of the film formation, has significant cleavage plane. Iron barium ion ratio of 8 and 10.5 are able to form high quality films. 1100 ° C, and 2 hours of the heat treatment under the conditions of the preparation of barium ferrite film into regular hexagonal platelets, and has a very strong uniaxial anisotropy. -Plane direction, the remanence ratio reached 0.75, and a coercive force of 3.4 kOe, the in-plane direction, the remanence ratio is 0.12, the coercive force of about 1.1 kOe.

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CLC: > Industrial Technology > Electrotechnical > Electrical materials > Magnetic materials,ferrite > Ferrite,oxide magnetic materials
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