Observation of superspin glass state in magnetically textured ferrofluid (gamma-Fe2O3)

TL;DR

This study demonstrates the existence of a superspin glass state at low temperatures in a magnetically textured gamma-Fe2O3 ferrofluid, confirmed through AC susceptibility measurements, highlighting the effects of anisotropy axis orientation.

Contribution

It provides the first evidence of superspin glass behavior in textured gamma-Fe2O3 ferrofluids, expanding understanding of magnetic glassy states in anisotropic nanoparticle systems.

Findings

Superspin glass state observed at low temperature.

AC susceptibility confirms glassy behavior.

Anisotropy axis orientation affects aging in the glassy state.

Abstract

Magnetic properties in a magnetically textured ferrofluid made out of interacting maghemite (gamma-Fe2O3) nanoparticles suspended in glycerin have been investigated. Despite the loss of uniform distribution of anisotropy axes, a superspin glass state exists at low temperature in a concentrated, textured ferrofluid as in the case of its non-textured counterpart. The onset of superspin glass state was verified from the sample's AC susceptibility. The influence of the anisotropy axis orientation on the aging behavior in the glassy states is also discussed.