Magnetic Properties of Small Magnetite Nanocrystals

This paper focuses on the study of the magnetic properties of 9 nm magnetite nanocrystals. XRD and TEM measurements indicate the presence of crystalline particles, with a fraction of them only partially crystallized or highly defective. The analysis of the temperature dependence of the Zero-Field-Cooled/Field-Cooled magnetization and of the thermoremanent magnetization provides evidence of the existence of three magnetic regimes: an high temperature regime (300 – 100 K), an intermediate regime (100- 20 K) and a low temperature regime (below 20K). The characteristics of such regimes are discussed