RKKY interaction of magnetic moments in nanosized systems

TL;DR

This paper investigates how the RKKY interaction influences magnetic ordering in nanosized spherical systems, emphasizing the importance of finite size effects on the Curie temperature.

Contribution

It provides a mean-field analysis of size-dependent RKKY interactions, highlighting the need to consider finite system dimensions in magnetic property calculations.

Findings

Interaction energy depends strongly on system size.

Curie temperature varies with size and concentration.

Finite size effects are crucial for nanosystem magnetic behavior.

Abstract

Nanosized spherical system of magnetic moments interacting indirectly via the RKKY mechanism is studied. The interaction energy that determines the temperature of the ferromagnetic ordering, depends strongly on the system size. Obtained in the mean-field approximation, dimensional and concentration dependencies of the Curie temperature testify to the necessity of taking into account the finite size of such systems to calculate their features. Results may concern both artificially constructed nanosystems and naturally arising formations (such as clusters of magnetic ions in diluted magnetic semiconductors, etc.).