Influence of the Competition Between Dipolar and Exchange Interactions on the Magnetic Structure of Single-Wall Nanocylinders. Monte Carlo Simulation

Abstract

In this work, we address the Metropolis Monte Carlo simulation of single-wall magnetic nanocylinders with zig-zag edges on the basis of a three-dimensional classical Heisenberg model with short-range nearest neighbors ferromagnetic exchange interactions and long-range dipolar interactions. A study of the magnetic properties (thermal dependence of the magnetization per site, specific heat, and magnetic susceptibility) with different strengths of dipolar interaction relative to the exchange energy is carried out. Our results reveal a strong dependence of the low-temperature magnetic structure of the nanotubes with the strength (γ) of the dipolar interaction. Comparisons with the case without considering dipolar interaction are carried out and a summary of our results in terms of the γ-dependence of the low-temperature magnetization is also presented and discussed.