TAILIEUCHUNG - Báo cáo " Signficantly improving magnetic properties of Sr-La-Co hexagonal ferrite"

The hard magnetic ferrite system of Sr1-xLaxFe12-yCoyO19 with x = and y = has been prepared by traditional ceramic technology and showed hexagonal crystalline structure of anisotropic sample + weight SiO2 sintered at 1280oC/2h has the best hard magnetic properties, namely Br = kG; BHC = kOe and (BH)max = . | VNU Journal of Science Mathematics - Physics 25 2009 199-205 Signficantly improving magnetic properties of Sr-La-Co hexagonal ferrite Nguyen Khanh Dung1 Nguyen Thi Le Huyen2 HoChiMinh City University of Industry 12 Nguyen Van Bao Ward 4 Go Vap District Hochiminh city Vietnam 2 Institute of Physics in HoChiMinh City 1 Mac Dinh Chi 1 District Hochiminh city Vietnam Received 5 September 2009 Abstract The hard magnetic ferrite system of Sr1-xLaxFe12-yCoyO19 with x and y has been prepared by traditional ceramic technology and showed hexagonal crystalline structure of anisotropic sample weight SiO2 sintered at 1280oC 2h has the best hard magnetic properties namely Br kG BHC kOe and BH max . The role of La and Co as well as the reasons leading to these perfect properties of the studied ferrites have been discussed based on the overall studies of structure and characteristics of examined samples. 1. Introduction In more than a half century from the discovery of hexagonal ferrite ferrite magnets always used very popular and everywhere in science technology life and especially in civil electronics industry in communications and other different areas due to cheap price as well as simple technology. But still now the problem to improve hard magnetic properties of this kind of materials always attracted the researchers and technologists. We are talking about two main following trends - Using different doping elements including 3d and Rare-earth metal oxides with hoping that saturation magnetization and magnetocrystalline anisotropy will be improved 1-4 . - Applying advance technologies such as coprecipitation sol-gel high pressure compressing hot pressing isostatic pressing .to manufacture ferrite powder and product 5-8 . In this report we study the structure and magnetic properties of ferrite system Sr1-xLaxFe12-y CoyO19 x and y to improve the quality of hard magnetic ferrite and explain

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