Microwave absorption phenomena in rare earth metals

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Abstract
Microwave absorption phenomena have been observed in single crystals of the rare-earth metals Tb, Dy, Ho and Er, at frequencies of 9.44 and 35.3 Gc/s in the temperature range 10 to 290 °K. All of these metals show microwave absorption at the critical field transitions. In Tb and Dy, additional absorption lines have been observed which are associated with the ferromagnetic spin configuration. The microwave results are discussed in terms of the normal mode frequencies derived on the basis of the spin wave approximation.