Magneto-Optical and Magnetic Properties of Co-Substituted BaM

BaM(BaFe
₁₂
O
₁₉
) has strong crystal anisotropy, but its Faraday rotation is low at only 0.22 deg/μm (λ= 780 nm). An attempt to improve the properties of this material as magneto-optical recording media by replacing part of the Fe in BaM with Co is discussed. It was found that θ
_F
increased with the amount of Co substituted. The investigation confirmed that Co is effective in increasing BaM θ
_F
. When La is used for Co charge compensation, along with increasing θ
_F
, it was also found that the crystal anisotropy becomes high, and the properties of the material as magneto-optical recording media improved.