Effect of B-site bismuth doping on magnetic and transport properties of La0.5Ca0.5Mn1-xBixO3 thin films

TL;DR

This study investigates how B-site bismuth doping influences the magnetic and transport properties of La0.5Ca0.5Mn1-xBixO3 thin films, revealing enhanced magnetoresistance and ferromagnetic ordering at specific doping levels for potential spintronics applications.

Contribution

It demonstrates the effect of B-site bismuth doping on magnetic and transport properties in La0.5Ca0.5MnO3 thin films, highlighting improvements at x=0.02 and degradation at x=0.05.

Findings

Enhanced magnetization and TC at x=0.02

High magnetoresistance (~98%) and anisotropic magnetoresistance (~42%) at 50 K for x=0.02

Decreased magnetization and TC at x=0.05

Abstract

The magnetic properties in manganite have been found to be highly sensitive to the doping and structural manipulations. Here, we report the effect of B-site bismuth doping on the magnetic and transport properties in La0.5Ca0.5Mn1-xBixO3 (LCMBO) thin films (for x = 0, 0.02 and 0.05) for high-efficiency spintronics devices. For thin film of LCMBO (with x = 0.02), a significant increase in the magnetization and ferromagnetic ordering temperature (TC) are observed. Also, about 98% magnetoresistance (MR) and unusually large (~ 42%) anisotropic magnetoresistance (AMR) is observed at 50 K in the same LCMBO (for x = 0.02) thin film. This observed improvement in TC, MR and AMR in LCMBO (with x = 0.02) thin film may be attributed to the modulation of the trapped electrons through JT-distortions due to the replacement of Mn+3 ions by larger Bi+3 ions. With further increase in bismuth doping (for x = 0.05) at the B-site, a significant decrease in magnetization and TC have been observed.