Temperature dependence of magnetic anisotropy in bulk and nanoparticles of Pr_0.5Sr_0.5MnO_3

TL;DR

This study investigates how magnetic anisotropy in Pr_0.5Sr_0.5MnO_3 varies with temperature in both bulk and nanoparticle forms, revealing size-dependent magnetic transition behaviors and complex anisotropy patterns.

Contribution

It provides new insights into the temperature-dependent magnetic anisotropy differences between bulk and nanoparticle Pr_0.5Sr_0.5MnO_3, using ferromagnetic resonance and magnetization measurements.

Findings

Ferromagnetic transition at 265 K remains unchanged in nanoparticles.

Antiferromagnetic transition at 150 K disappears in nanoparticles.

Magnetic anisotropy shows complex temperature dependence, higher at high T in nanoparticles.

Abstract

Nanoparticles (size 20, 40 and 60 nm) of Pr_0.5Sr_0.5MnO_3 are prepared by sol-gel technique and their magnetic properties are studied using ferromagnetic resonance and magnetization measurements. A comparison with the properties of the bulk material shows that the ferromagnetic transition at 265 K remains unaffected but the anti-ferromagnetic transition at T_N = 150 K disappears in the nanoparticles. Further, the temperature dependence of magnetic anisotropy shows a complex behavior, being higher in the nanoparticles at high temperatures and lower at lower temperatures in comparison with the bulk.