# Electron Transport in Nanogranular Ferromagnets

## TL;DR

This paper investigates electron transport in ferromagnetic nanoparticle arrays near the Curie temperature, focusing on conductivity, magnetoresistance, and the effects of weak intergrain coupling.

## Contribution

It provides theoretical calculations of conductivity and magnetoresistance jumps in nanogranular ferromagnets near the transition temperature, applicable to various emerging materials.

## Key findings

- Calculated conductivity in Ohmic and non-Ohmic regimes.
- Estimated magnetoresistance jump at Curie temperature.
- Applicable to self-assembled nanoparticle arrays and manganites.

## Abstract

We study electronic transport properties of ferromagnetic nanoparticle arrays and nanodomain materials near the Curie temperature in the limit of weak coupling between the grains. We calculate the conductivity in the Ohmic and non-Ohmic regimes and estimate the magnetoresistance jump in the resistivity at the transition temperature. The results are applicable for many emerging materials, including artificially self-assembled nanoparticle arrays and a certain class of manganites, where localization effects within the clusters can be neglected.