Abstract
The field dependence of the ac susceptibility of a concentrated frozen ferrofluid containing ultrafine Fe-C particles of monodisperse nature has been analyzed using static scaling. For the first time, a divergent behavior of the nonlinear susceptibility of a dipole-dipole interacting system is demonstrated. From the analysis, the critical exponents and were extracted. The results support the existence of a low temperature spin-glass-like phase in interacting magnetic nanoparticle systems.
- Received 22 April 1998
DOI:https://doi.org/10.1103/PhysRevLett.81.3976
©1998 American Physical Society