Cylindrical Ising Nanowire in an Oscillating Magnetic Field and Dynamic Compensation Temperature

TL;DR

This study investigates the dynamic magnetic properties of a cylindrical Ising nanowire with core/shell structure under an oscillating magnetic field, revealing phase transitions, compensation points, and complex phase diagrams through a mean-field approach.

Contribution

It introduces a mean-field dynamic model for a nonequilibrium cylindrical Ising nanowire system, analyzing phase transitions and compensation phenomena under oscillating magnetic fields.

Findings

Identification of various phase transition types.

Existence of multiple compensation points with different behaviors.

Complex phase diagrams with reentrant phenomena.

Abstract

The magnetic properties of a nonequilibrium spin-1/2 cylindrical Ising nanowire system with core/shell in an oscillating magnetic field are studied by using a mean-field approach based on the Glauber-type stochastic dynamics (DMFT). We employ the Glaubertype stochastic dynamics to construct set of the coupled mean-field dynamic equations. First, we study the temperature dependence of the dynamic order parameters to characterize the nature of the phase transitions and to obtain the dynamic phase transition points. Then, we investigate the temperature dependence of the total magnetization to find the dynamic compensation points as well as to determine the type of behavior. The phase diagrams in which contain the paramagnetic, ferromagnetic, antiferromagnetic, nonmagnetic, surface fundamental phases and tree mixed phases as well as reentrant behavior are presented in the reduced magnetic field amplitude and reduced temperature plane. According to values of Hamiltonian parameters, the compensation temperatures, or the N-, Q-, P-, R-, S-type behaviors in the Neel classification nomenclature exist in the system.