Spin freezing in the spin-liquid compound FeAl2 O4

Harikrishnan S. Nair, Ramesh Kumar K, André M. Strydom

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Spin freezing in the A-site spinel FeAl2O4, which is a spin-liquid candidate, is studied using remnant magnetization and nonlinear magnetic susceptibility and isofield cooling and heating protocols. The remnant magnetization behavior of FeAl2O4 differs significantly from that of a canonical spin glass, which is also supported by analysis of the nonlinear magnetic susceptibility term χ3(T). Through the power-law analysis of χ3(T), a spin-freezing temperature Tg=11.4±0.9 K and critical exponent γ=1.48±0.59 are obtained. A Cole-Cole analysis of magnetic susceptibility shows the presence of broad spin relaxation times in FeAl2O4, however, the irreversible dc susceptibility plot discourages an interpretation based on conventional spin-glass features. The magnetization measured using the cooling-and-heating-in-unequal-fields protocol brings more insight into the magnetic nature of this frustrated magnet and reveals unconventional glassy behavior. Combining our results, we arrive at the conclusion that the present sample of FeAl2O4 consists of a majority spin-liquid phase with "glassy" regions embedded.

Original languageEnglish
Article number054423
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number5
Publication statusPublished - 26 Feb 2015

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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