Abstract
Measurements of magnetization, ac susceptibility and microwave absorption at 9.5 and 35 GHz, have been carried out with single crystals of Dy, Tb 74Y 26, Tb 79Y 21, Tb 81Y 19. These crystals exhibit a stable helix phase at high temperatures; Tb 74Y 26, Tb 79Y 21, also exhibit a low temperature ‘frozen-in’ antiferromagnet state. The critical temperatures T c, T N, and the maximum critical field for the stable helix-ferromagnet transition are, Dy: 80 K, 179 K, 11 kG; Tb 74Y 26: 25 K, 198 K, 9.6 kG; Tb 79Y 21: 93 K, 202 K, 7.4 kG; Tb 81Y 19: 116 K, 205 K, 5.5 kG. Values for the exchange parameter { ▪( Q ) - ▪(0)} estimated from the data are about 0.2 x 10 -3 eV.
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