Abstract
We report here a comparison between a field-driven spin-flop (TbMn6 Sn5.46In0.54) and a temperature-driven spin reorientation (TbMn6Sn6-x Gax) in order to demonstrate that the anisotropic contribution to Bhf at the Sn sites can be obtained through the moment reorientation and is independent of the driving force. We show that a complete 90° spin reorientation can be achieved at 300 K in an applied field of 0.57(3) T and that the changes in hyperfine field due to the anisotropic contribution exceed 45% at one of the Sn sites. Quantitative values for the anisotropic constant at the three Sn sites are obtained.
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