Abstract
Electron spin resonance experiments at millimeter and submillimeter wavelengths have been performed on the randomly mixed antiferromagnet with competing spin anisotropies, Fe 0.05Co 0.95Cl 2. An Fe 2+ localized excitation has been observed in addition to the two antiferromagnetic resonance modes. It is shown from the analysis of the localized mode that even in the Co-rich antiferromagnetic phase, the Fe 2+ spins are not parallel to the host spins. The angle (θ Fe) that the Fe 2+ spin makes with the c-axis of the crystal is 71°. This value of θ Fe is in good agreement with that obtained from the Mössbauer study by Howes et al. [2].
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