Magnetic Interactions in Ball-Milled Spinel Ferrites

TL;DR

This study investigates how ball-milled Fe3O4 nanoparticles exhibit superparamagnetic and spin-glass-like behaviors depending on interparticle interactions, revealing the influence of particle concentration on magnetic properties.

Contribution

It provides new insights into the magnetic behavior of ball-milled Fe3O4 nanoparticles and how interparticle interactions affect their superparamagnetic and spin-glass-like states.

Findings

Superparamagnetic behavior with a blocking temperature around 10-20 K.

Transition to a spin-glass-like state at high particle concentrations.

Decrease in saturation magnetization indicating spin disorder.

Abstract

Spinel Fe3O4 nanoparticles have been produced through ball milling in methyl-alcohol (CH3OH), aiming to obtain samples with similar average particle sizes <d> and different interparticle interactions. Three samples having Fe3O4/CH3(OH) mass ratios R of 3 %, 10 % and 50 % wt. were milled for several hours until particle size reached a steady value (<d> ~ 7-10 nm). A detailed study of static and dynamic magnetic properties has been undertaken by measuring magnetization, ac susceptibility and M\"ossbauer data. As expected for small particles, the Verwey transition was not observed, but instead superparamagnetic (SPM) behavior was found with transition to a blocked state at TB ~ 10-20 K. Spin disorder of the resulting particles, independent of its concentration, was inferred from the decrease of saturation magnetization MS at low temperatures. For samples having 3% wt. of magnetic particles, dynamic ac susceptibility measurements show a thermally activated Arrhenius dependence of the blocking temperature with applied frequency. This behaviour is found to change as interparticle interactions begin to rule the dynamics of the system, yielding a spin-glass-like state at low temperatures for R = 50 wt.% sample.