# Spin filtering through ferromagnetic BiMnO3 tunnel barriers

**Authors:** M. Gajek, M. Bibes, A. Barthelemy, K. Bouzehouane, S. Fusil, M. Varela, J. Fontcuberta, A. Fert  
**arXiv:** [cond-mat/0504667](https://arxiv.org/abs/cond-mat/0504667)  
**Date:** 2005-04-26  
**Summary page:** https://www.summarizepaper.com/fr/paper/cond-mat--0504667v1/

## Abstract

We report on experiments of spin filtering through ultra-thin single-crystal layers of the insulating and ferromagnetic oxide BiMnO3 (BMO). The spin polarization of the electrons tunneling from a gold electrode through BMO is analyzed with a counter-electrode of the half-metallic oxide La2/3Sr1/3MnO3 (LSMO). At 3 K we find a 50% change of the tunnel resistances according to whether the magnetizations of BMO and LSMO are parallel or opposite. This effect corresponds to a spin filtering effciency of up to 22%. Our results thus show the potential of complex ferromagnetic insulating oxides for spin filtering and injection.