Finite temperature orbital and spin magnetism of small Fe linear chains

Abstract

The finite temperature spin and orbital magnetism of N≤ 10 Fe(N) linear chains is theoretically studied in the framework of a spin fluctuation theory based on a realistic d-band model Hamiltonian, which includes the spin-orbit coupling interaction in a non-perturbative way. Spin and orbital magnetic moments are calculated as a function of the temperature by using an exchange Monte Carlo method that takes into account in a full way the short-range magnetic order. The finite temperature anisotropy effects on the spin and orbital cluster moment values are analysed by considering magnetization directions perpendicular to and along the chain axis. The temperature dependence of the orbital cluster moment follows a general trend similar to that of the spin one and shows clear anisotropy effects at low and intermediate temperatures, before total thermal disorder appears. Interesting anisotropy effects driven by thermal spin fluctuations are also observed for the spin results in most of the systems.

Ferromagnetism in Monatomic Chains: Spin-Dependent Bandwidth Narrowing/Broadening

“…These NWs show enhanced magnetism, as compared to their bulk (3D) state, and quantized conductance. They are predicted to be technologically useful for spintronics-based devices. , Various studies have been carried out on 1D monatomic chains , including transition elements of 3d series, ,,− 4d series, , 5d series, ,,, and alkali metals. − It was found that Pt nanowires exhibit Hund’s rule magnetism, and the magnetic moment increases upon stretching; however, in the bulk state Pt does not show magnetism . Delin et al explored the spin dynamics of atomically thin platinum wires based on first-principles calculations.…”