Finite-Size effects in "Single Chain Magnets": an experimental and theoretical study

TL;DR

This paper investigates finite-size effects in single chain magnets through experimental measurements and theoretical analysis, revealing how impurities influence magnetic dynamics and confirming theoretical predictions about relaxation behavior.

Contribution

It provides new experimental data and theoretical insights into how diamagnetic impurities affect the static and dynamic magnetic properties of single chain magnets.

Findings

Arrhenius law observed with same energy barrier in pure and doped compounds

Prefactor decreases with doping, matching theoretical predictions

Multiple spins reversal behavior analyzed

Abstract

The problem of finite size effects in s=1/2 Ising systems showing slow dynamics of the magnetization is investigated introducing diamagnetic impurities in a Co$^{2+}$-radical chain. The static magnetic properties have been measured and analyzed considering the peculiarities induced by the ferrimagnetic character of the compound. The dynamic susceptibility shows that an Arrhenius law is observed with the same energy barrier for the pure and the doped compounds while the prefactor decreases, as theoretically predicted. Multiple spins reversal has also been investigated.