We report on unusual magnetic properties observed in the nanofluid room-temperature ferromagnetic graphite (with an average particle size of l=10nm). More precisely, the measured magnetization exhibits a low-temperature anomaly (attributed to manifestation of finite size effects below the quantum temperature) as well as pronounced temperature oscillations above T=50K (attributed to manifestation of the hard-sphere type pair correlations between ferromagnetic particles in the nanofluid).
@article{arxiv.0912.5350,
title = {Temperature oscillations of magnetization observed in nanofluid ferromagnetic graphite},
author = {S. Sergeenkov and N. S. Souza and C. Speglich and V. A. G. Rivera and C. A. Cardoso and H. Pardo and A. W. Mombru and F. M. Araujo-Moreira},
journal= {arXiv preprint arXiv:0912.5350},
year = {2009}
}