# 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/en/paper/cond-mat--0504667v1/

## Key points

- The study explores the potential of complex ferromagnetic insulating oxides for spin filtering and injection.
- Researchers report on experiments involving spin filtering through ultra-thin single-crystal layers of BiMnO3 (BMO).
- Spin polarization of electrons tunneling from a gold electrode through BMO is analyzed with a counter-electrode of La2/3Sr1/3MnO3 (LSMO).
- At 3 K, researchers found a 50% change in tunnel resistances depending on whether the magnetizations of BMO and LSMO were parallel or opposite.
- This effect corresponds to a spin filtering efficiency of up to 22%.
- Complex ferromagnetic insulating oxides have significant potential for use in spin filtering and injection applications.

## Summary

This study explores the potential of complex ferromagnetic insulating oxides for spin filtering and injection. Specifically, the researchers report on experiments involving spin filtering through ultra-thin single-crystal layers of the insulating and ferromagnetic oxide BiMnO3 (BMO). The spin polarization of 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, the researchers found that there was a 50% change in tunnel resistances depending on whether the magnetizations of BMO and LSMO were parallel or opposite. This effect corresponds to a spin filtering efficiency of up to 22%. These findings demonstrate that complex ferromagnetic insulating oxides have significant potential for use in spin filtering and injection applications, offering promising prospects for future research.