Magneto- and Electrotransport Properties of Nd0.67Sr0.33Mn1-xFexO3 (x = 0.00, 0.05)

TL;DR

This study investigates the magnetic and electrotransport properties of Nd0.67Sr0.33Mn1-xFexO3, revealing significant magnetoresistance effects and anisotropy, with Fe substitution enhancing these properties, especially in thin films.

Contribution

It provides new insights into how Fe substitution affects magnetoresistance and magnetic transition temperatures in Nd0.67Sr0.33MnO3 bulk and thin film materials.

Findings

High magnetoresistance (~33%) at 273 K in bulk material.

Fe substitution increases MR, reaching ~90% in thin films.

Pronounced anisotropy observed in thin film MR.

Abstract

Simultaneous studies on the magnetic and electrotransport properties of Nd_{0.67} Sr_{0.33} Mn_{1-x} Fe_x O_3 polycrystalline bulk and epitaxial thin films (x = 0.00 and 0.05) have been carried out. A magnetoresistance (MR) as high as ~ 33% is observed for Nd_{0.67} Sr_{0.33} MnO_3 bulk at the metal-insulator transition (MIT) temperature (T_p) of 273 K in a magnetic field (H) of 10 kOe. Fe substitution at Mn sites reduces the ferromagnetic (FM) ordering temperature (T_c) and leads to an overall increase in MR. MR as high as ~ 90% is observed for thin film (x = 0.05) at H = 10 kOe with T_p = 100 K while the corresponding bulk has a MR of only ~ 43%. Low field MR in epitaxial thin films also display a pronounced anisotropy effect compared to bulk materials.