Investigation of bond dilution effects on the magnetic properties of a cylindrical Ising nanowire

TL;DR

This study explores how bond dilution affects the magnetic properties of a cylindrical Ising nanowire with ferromagnetic core and shell, revealing new magnetization behaviors and the induction of a compensation point.

Contribution

It introduces the effects of quenched disordered shell and interface bonds on nanowire magnetism, including novel L-type behavior and bond dilution-induced compensation points.

Findings

Magnetization profiles include Q, P, N, and newly reported L-type behaviors.

Bond dilution can induce a compensation point in the nanowire.

No evidence of first order phase transitions or reentrance phenomena.

Abstract

A cylindrical magnetic nanowire system composed of ferromagnetic core and shell layers has been investigated by using effective field theory with correlations. Both ferromagnetic and antiferromagnetic exchange couplings at the core-shell interface have been considered. Main attention has been focused on the effects of the quenched disordered shell bonds, as well as interface bonds on the magnetic properties of the system. A complete picture of the phase diagrams and magnetization profiles has been represented. It has been shown that for the antiferromagnetic nanowire system, the magnetization curves can be classified according to N\'{e}el theory of ferrimagnetism and it has been found that under certain conditions, the magnetization profiles may exhibit Q-type, P-type, N-type and L-type behaviors. The observed L-type behavior has not been reported in the literature before for the equilibrium properties of nanoscaled magnets. As another interesting feature of the system, it has been found that a compensation point can be induced by a bond dilution process in the surface. Furthermore, we have not found any evidence of neither the first order phase transition characteristics, nor the reentrance phenomena.