Magnetic behavior of nano crystals of a spin-chain system, Ca3Co2O6: Absence of multiple steps in the low temperature isothermal magnetization

TL;DR

This study investigates the magnetic properties of nano-sized Ca3Co2O6, revealing that while temperature-dependent magnetization remains similar to bulk, the characteristic multiple steps in low-temperature isothermal magnetization are absent in nanoparticles.

Contribution

It demonstrates that nano form of Ca3Co2O6 retains bulk-like temperature magnetization features but lacks the multiple magnetization steps seen in bulk, providing insights into size effects on magnetic behavior.

Findings

Temperature dependence of magnetization remains unchanged in nano form

Multiple steps in low-temperature isothermal magnetization are absent in nanoparticles

Nano particles show similar magnetic transitions as bulk but differ in magnetization steps

Abstract

We report that the major features in the temperature dependence of dc and ac magnetization of a well-known spin-chain compound, Ca3Co2O6, which has been known to exhibit two complex magnetic transitions due to geometrical frustration (one near 24 K and the other near 10 K), are found to be qualitatively unaffected in its nano form synthesized by high-energy ball-milling. However, the multiple steps in isothermal magnetization - a topic of current interest in low-dimensional systems - known for the bulk form well below 10 K is absent in the nano particles. We believe that this finding will be useful to the understanding of the 'step' magnetization behavior of such spin-chain systems.