MAGNETIC RESONANCE IN DILUTE MAGNETIC ALLOYS : HYPERFINE SPLITTING OF Ag : Er167

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Abstract
The hyperfine splitting of the erbium localized moment resonance line in silver metal has been observed both in reflection and transmission for nominal concentrations of 28, 65, 86 and 1.500 ppm solid solution Ag : Er alloys. A hyperfine coupling constant A = 75 ± 1.0 œrsteds was found to fit the individual line positions to within experimental accuracy. The results are analyzed in terms of the coupled localized-conduction electron response function. Three regions are identified theoretically : 1) no magnetic resonance bottleneck ; 2) a bottleneck present, but 1/Tse small compared to the hyperfine splitting ; and 3) a bottleneck present, and 1/Tse large compared to the hyperfine splitting. The Ag : Er measurements appear to fit category 1). It is shown that category 3) probably applies to most previous experiments on transition metal alloys, but that category 2) might be obtainable at sufficiently low temperatures. Line width measurements in the region of category 2) would exhibit exchange broadenings, and enable the value of the exchange coupling to be extracted from magnetic resonance measurements even in the bottlenecked regime

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