Abstract
Substitution of small quantities of Co for Fe in the rare earth orthoferrites has a marked effect on magnetocrystalline anisotropy and can reorient the net moment of these canted spin antiferromagnets from the c-axis to the a-axis of the orthorhombic cell. In the latter orientation, the moments of the Yb, Tm, Er and Ho compounds are markedly changed and a directed L+2S contribution from the rare earth to the net moment is evident. The rare earth spin tends to align parallel to the net Fe-moment.
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