Abstract
Spin-wave dispersion relations in Mn 1.9Fe 0.1Sb and Mn 1.97Cr 0.03Sb were measured for q‖ c ∗-axis over a wide temperature range. The effective interlayer exchange interactions ( J 1 S and J 2 S) determined are discussed together with those of different Cr compositions in relation to the exchange inversion transition. An increase of J 1 S below 200 K was observed commonly in the ferrimagnetic phase.
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