Comment on "Measuring the transverse magnetization of rotating ferrofluids".
Contrary to the main conclusion of Embs [Phys. Rev. E 73, 036302 (2006)], we demonstrate with amplitude correction factors that the predictions of the magnetization model proposed by Shliomis [Sov. Phys. JETP 34, 1291 (1972)] are well consistent with the experimental data for weakly nonequilibrium states and that the model proposed by Shliomis [Phys. Rev. E 64, 063501 (2001)] is valid even far from equilibrium. A model on the basis of the weak-field magnetization equation of Müller and Liu [Phys. Res. E 64, 061405 (2001)] with a "structure" modification is also shown to reproduce a wide range of experimental data. Our statement is confirmed by a more exact insight into the hydrodynamic problem of rotating ferrofluids.
Weng
Huei Chu
HC
Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan 70101, Taiwan.
Chen
Cha'o-Kuang
CK