Observation of minority spin character of the new electron doped manganite La_0.7Ce_0.3MnO_3 from tunneling magnetoresistance

TL;DR

This study investigates the magnetotransport properties of a trilayer junction involving an electron-doped manganite, revealing that La_0.7Ce_0.3MnO_3 exhibits minority spin character and high spin polarization, indicating it acts as a transport half metal.

Contribution

It provides experimental evidence that La_0.7Ce_0.3MnO_3 is a minority spin carrier ferromagnet with high spin polarization, a novel insight into electron-doped manganites.

Findings

Large positive TMR at low temperatures

TMR sign depends on bias voltage below T_C

La_0.7Ce_0.3MnO_3 is a minority spin ferromagnet

Abstract

We report the magnetotransport characteristics of a trilayer ferromagnetic tunnel junction build of an electron doped manganite (La_0.7Ce_0.3MnO_3) and a hole doped manganite (La_0.7Ca_0.3MnO_3). At low temperatures the junction exhibits a large positive tunneling magnetoresistance (TMR), irrespective of the bias voltage. At intermediate temperatures below T_C the sign of the TMR is dependent on the bias voltage across the junction. The magnetoresistive characteristics of the junction strongly suggest that La_0.7Ce_0.3MnO_3 is a minority spin carrier ferromagnet with a high degree of spin polarization, i.e. a transport half metal.