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No.2(pp.39-69)

Home > Issues > Volume 4 (1999) > No.2(pp.39-69)

Magnetic and Microwave Absorbing Properties of Ti-and Co-Substituted Barium Ferrite (BaFe_12-2X Ti_XCo_XO₁₉)

Journal of Magnetics, Volume 4, Number 2, 30 Jun 1999, Pages 65-68

Han-Shin Cho(Department of Materials Engineering, Chungbuk National University), Yong-Jin Kim(Department of Materials Engineering, Chungbuk National University), Sung-Soo Kim(Department of Materials Engineering, Chungbuk National University)

Abstract

The M-type barium ferrite (BaFe₁₂O₁₉) is well known magnetic material to be used as a permanent magnet due to its strong uniaxial anisotropy. The substitution of nonmagnetic Ti⁺⁴and magnetically weak Co⁺² ion for Fe⁺³sublattices reduces the uniaxial anisotropy and those compounds open a new application field of noise suppressor at high frequencies. In this study, the magnetic and microwave absorbing properties are investigated in Ti- and Co- substituted barium ferrites (BaFe_12-2XTi_XCo_XO₁₉). The saturated magnetization decreases linearly with the substitution of Ti and Co. The rapid drop in coercive force is observed with Ti and Co substitution upto x=1.2. The magnetic permeability spectrum shows the natural magnetic resonance in the specimens with small coercive force and large attenuation of microwave is predicted in those specimens at high frequencies (above 4 GHz).

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