Ferromagnetic Nano-Structures in Valenta Model

TL;DR

This paper enhances the Valenta model with an effective field approach to accurately describe ferromagnetic nano-structures, achieving excellent agreement with experimental data for magnetization and Curie temperatures.

Contribution

The paper introduces a generalized Valenta model incorporating effective field methods to better match experimental results for nano-structure magnetization.

Findings

Excellent agreement between theory and experiment achieved.

Magnetization profiles depend on layer position and neighboring interactions.

Layer-resolved analysis reveals detailed dependence of magnetic properties.

Abstract

The ferromagnetic nano-structures are recently of great interest for modern investigations. A comparison of the experimental data and theoretical results shows that the use of the standard molecular field approximation is insufficient for the description of nano-structure properties. Therefore, we use the effective field approach in order to show the usefulness of the Valenta model generalized in this way. The agreement between experiment and theory is then excellent. The magnetization profiles and the calculated Curie temperatures are presented for the systems consisting of Ni and Co layers with different configuration of the surfaces and interfaces including terraces and wires. We have shown that the position in the system as well as the kind of neighbouring layers and their mutual interactions can determine the shape of magnetization profiles. The use of the Valenta model allows us to present all dependences in the layer resolved mode.