Abstract
Some new experimental results concerning the magnetic resonance in Pr3+-doped YIG are presented and discussed, together with the results for Tb3+ and Ho3+ in YIG already published, in terms of existing theories. It is shown that the magnetization directions corresponding to the near crossings of energy levels in the case of Ho3+ can lie within a certain local plane and, in the case of Pr3+, can coincide with a local axis of the dodecahedral site (for Tb3+, as Huber has found, these directions form a conical surface). The angle and temperature dependences of ΔH for Tb3+ and Ho3+ are very similar and can be explained completely in terms of slow relaxation. For Pr3+ these dependences in the directions of near crossings resemble the ``anomalous'' behavior for Yb3+ in octahedral sites. A contribution from transverse relaxation is probable in the case of Pr3+.
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