Details

Autor(en) / Beteiligte

• Majlis, Norberto
• Zuckermann, Martin J

Titel

Spin-glass-like behaviour of a collection of nano-granular magnetic particles embedded in an insulating thin film and interacting only via dipolar forces

Ist Teil von

• Journal of physics communications, 2018-06, Vol.2 (6), p.65002

Ort / Verlag

IOP Publishing

Erscheinungsjahr

2018

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• We perform Metropolis Monte Carlo simulations of the behaviour of a film of insulating material containing a distribution of magnetic nanoparticles. We assume that these particles only interact through dipolar forces and we find that their behaviour at low temperatures shows characteristics of a spin-glass with a freezing temperature at which the linear susceptibility and the specific heat exhibit a maximum. We define an order parameter which shows a similar dependence on the temperature to the one expected for a spin-glass . We also calculate the correlation of the orientation of the magnetic dipole at the center of the system at different times. All our results are consistent with the temperature dependence of the variance and the mean of the local field acting on the central dipole. Furthermore, the total magnetic dipole of the system scales with the square root of the number of particles, which indicates that the dipole orientations are randomly distributed, as expected for a spin-glass.