Electron Transport in Nanogranular Ferromagnets

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.

arXiv comment4 pages, 2 figures

References in corpus (9)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Double Exchange Alone Does Not Explain the Resistivity of $L{a}_{1-x}S{r}_{x}Mn{O}_3$
• Granular Electronic Systems
• Phase Separation in Electronic Models for Manganites
• Explanation of Giant Cluster Coexistence in Doped Manganites and Other Compounds
• Resistivity of Mixed-Phase Manganites
• Fermi Surface Nesting and Nanoscale Fluctuating Charge/Orbital Ordering in Colossal Magnetoresistive Oxides
• Interplay of spin and orbital ordering in the layered colossal magnetoresistance manganite La2-2xSr1+2xMn2O7 (0.5<=x<=1.0)
• Models for the magnetic ac susceptibility of granular superferromagnetic CoFe/Al${}_2$O${}_3$

Cited by in corpus (3)

• Interplay of Coulomb Blockade and Ferroelectricity in Nano-Granular Materials
• Influence of the Coulomb interaction on the exchange coupling in granular magnets
• Electron Transport Properties of Composite Ferroelectrics