Abstract
A study of the ac initial magnetic susceptibility of a roughly spherical single crystal of ${\mathrm{DyFe}}_{11}$Ti is reported. Both the real and imaginary parts of the complex susceptibility have been measured in absolute units along the principal crystallographic directions, the results being practically identical for [100] and [110]. The underlying mechanisms---coherent magnetization rotation and domain-wall motion---are considered. It is demonstrated that the thermally activated domain-wall displacements provide the clue to understanding the main features of the temperature dependence of both the real and imaginary parts of the observed susceptibility. \textcopyright{} 1996 The American Physical Society.
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