Dynamic-susceptibility studies of the interplay between the N,el and Brown magnetic relaxation mechanisms

作者：Botez Cristian E^*; Bhuiya AbdulW; Tackett Ronald J

来源：Applied Physics A-Materials Science & Processing, 2011, 104(1): 177-181.

DOI：10.1007/s00339-010-6098-x

We have used temperature- and frequency-resolved ac-susceptibility measurements to investigate the magnetic relaxation of a Co(0.2)Fe(2.8)O(4) magnetic fluid above the freezing point of the liquid carrier. Our data show that both the N,el and the Brown relaxation mechanisms are operative at temperatures in the vicinity of the out-of-phase (imaginary) susceptibility peak. We separate the contributions of the two mechanisms to the overall relaxation time, and demonstrate that Brownian relaxation plays a dominant role at all temperatures within this high-dissipation regime.

• 出版日期2011-7