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No.1(pp.1-41)

Home > Issues > Volume 6 (2001) > No.1(pp.1-41)

Barium Hexaferrite Thin Films Prepared by the Sol-Gel Method

Journal of Magnetics, Volume 6, Number 1, 31 Mar 2001, Pages 23-26

Sung-Yong An(Department of Physics, Kookmin University), Sang-Won Lee(Department of Physics, Kookmin University), In-Bo Shim(Department of Physics, Kookmin University), Sung-Roe Yun(Department of Physics, Kookmin University), Chul-Sung Kim*

(Department of Physics, Kookmin University)

Abstract

Nano-crystalline hexaferrite BaFe₁₂O₁₉ (BaM) thin films have been prepared by the sol-gel method. A solution of Ba-nitrate and Fe-nitrates was dissolved in solvent with the stoichiometric ratio Ba/Fe=1/10. Films were spin-coated onto SiO₂/Si substrates, dried and then heated in air at various temperatures. In films prepared at a drying temperature T_d=250 ℃ and a crystallizing temperature 650 ℃, single-phase BaM was obtained. High coercivities were obtained in these nano-crystalline thin films, 4~5.5 kOe for hexaferrite. Polycrystalline BaM/SiO₂/Si(100) thin films were characterized by Rutherford backscattering (RBS), thermogravimetry (TGA), differential thermal analysis (DTA), x-ray diffraction (XRD), and vibrating sample magnetometry (VSM), as well as Fourier transform infrared spectroscopy (FTIR). The perpendicular coercivity H_c┴ and in-plane coercivity H_cll after annealing at 650 ℃ for 2 hours were 4766 Oe and 4480 Oe, respectively, at room temperature, under a maximum applied field of 10 kOe.

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