High - Performance Ferrite Magnets: M - Type Sr - Ferrite Containing Lanthanum and Cobalt

K. Iida; Y. Minachi; K. Masuzawa; M. Kawakami; H. Nishio; H. Taguchi

doi:10.3379/jmsjmag.23.1093

Hard Magnetic Materials

High - Performance Ferrite Magnets: M - Type Sr - Ferrite Containing Lanthanum and Cobalt

K. Iida, Y. Minachi, K. Masuzawa, M. Kawakami, H. Nishio, H. Taguchi

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Keywords: M-type ferrite magnet, SrM-ferrite, substitution, La, Co, coercivity, temperature coefficient, magnetocrystalline anisotropy

JOURNAL OPEN ACCESS

1999 Volume 23 Issue 4_2 Pages 1093-1096

DOI https://doi.org/10.3379/jmsjmag.23.1093

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Abstract

Magnetic properties of anisotropic M-type Sr-ferrite containing La and Co (Sr_1-xLa_xCo_xFe_12-xO₁₉) was investigated in detail. At a composition of x = 0.3, the magnetic properties for permanent magnets were much improved, with the highest values of Br = 4.45 kG, HcJ = 4.82 kOe, and (BH)_max = 4.86 MGOe. The temperature dependence of the coercivity was also much improved, with ΔHcJ/HcJ/ΔT = 0.1 %/°C.

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