Abstract
AC magnetic susceptibility and optical transmission measurements were performed on Ni nanorod suspensions for ac and superimposed dc magnetic fields up to 9 mT. With the comparably large magnetic moment per nanorod, these field values correspond to Langevin parameters $\xi$ up to about 80. These wide range of $\xi$ values, the narrow size distribution, and the absence of Neel relaxation make these single-domain ferromagnetic nanorods ideally suited for the experimental verification of the dependence of the Brownian relaxation time on ac and dc magnetic fields. Consistent results for the magnetic moment m and the zero-field Brownian relaxation time $\tau _{B,0}$ were obtained for all measurement modalities and the valid field range of alternative models for the ac susceptibility was evaluated.
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