The microstructure and characteristics of magnetite thin films prepared by ultrasound-enhanced ferrite plating

Author

Oh, Chun-Young ; Oh, Jae-Hee ; Ko, Taegyung

Author_Institution

Dept. of Ceramic Eng., Inha Univ., Inchon, South Korea

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

3018

Lastpage

3020

Abstract

Magnetite thin films were produced using the ultrasound-enhanced ferrite plating method. The effect of ferrite plating conditions on the microstructure and magnetic properties was investigated. The saturation magnetization (Ms) and the coercive force (Hc) of the magnetic thin films were 465-475 emu/cm³ and 60-65 Oe, respectively. Then, the applicability of the magnetite thin films as a CO gas sensor was investigated. The magnetite thin films were annealed in the air to be converted to maghemite ones through oxidation, which manifested CO gas sensitivity. Rair/Rgas=3.5 was obtained in the CO gas sensitivity at the operation temperature of 85°C, when the thin films were annealed at 300°C.

Keywords

annealing; coercive force; crystal microstructure; ferrites; gas sensors; liquid phase deposition; magnetic thin films; magnetisation; ultrasonic applications; γ-Fe₂O₃; 300 degC; 85 degC; CO gas sensor; Fe₂O₃; Fe₃O₄; Fe₃O₄ magnetite thin films; annealing temperature; coercive force; maghemite conversion; magnetic properties; magnetic thin films; microstructure; operation temperature; oxidation; saturation magnetization; ultrasound-enhanced ferrite plating; Annealing; Coercive force; Ferrites; Magnetic films; Magnetic properties; Microstructure; Saturation magnetization; Thin film sensors; Transistors; Ultrasonic imaging;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.802121

Filename

1042443