Static and dynamic properties of Single-Chain Magnets with sharp and broad domain walls

TL;DR

This paper investigates the static and dynamic behaviors of single-chain magnets with different domain wall thicknesses using Monte Carlo simulations, revealing distinct regimes and emphasizing the importance of localized excitations and spin waves.

Contribution

It introduces a detailed analysis of how domain wall thickness influences static and dynamic properties in classical spin chains with uniaxial anisotropy, highlighting different regimes and experimental protocols.

Findings

Two regimes identified based on domain wall thickness

Localized excitations and spin waves interplay in broad domain walls

Different experimental characterization protocols are needed for broad domain walls

Abstract

We discuss time-quantified Monte-Carlo simulations on classical spin chains with uniaxial anisotropy in relation to static calculations. Depending on the thickness of domain walls, controlled by the relative strength of the exchange and magnetic anisotropy energy, we found two distinct regimes in which both the static and dynamic behavior are different. For broad domain walls, the interplay between localized excitations and spin waves turns out to be crucial at finite temperature. As a consequence, a different protocol should be followed in the experimental characterization of slow-relaxing spin chains with broad domain walls with respect to the usual Ising limit.