Repository logo

Nanopillar spin filter tunnel junctions with manganite barriers.



Change log


Prasad, Bhagwati 
Egilmez, Mehmet 
Schoofs, Frank 
Fix, Thomas 
Vickers, Mary E 


The potential of a manganite ferromagnetic insulator in the field of spin-filtering has been demonstrated. For this, an ultrathin film of Sm0.75Sr0.25MnO3 is integrated as a barrier in an epitaxial oxide nanopillar tunnel junction and a high spin polarization of up to 75% at 5 K has been achieved. A large zero-bias anomaly observed in the dynamic conductance at low temperatures is explained in terms of the Kondo scattering model. In addition, a decrease in spin polarization at low bias and hysteretic magneto-resistance at low temperatures are reported. The results open up new possibilities for spin-electronics and suggest exploration of other manganites-based materials for the room temperature spin-filter applications.



Spin filter, nanopillar, tunnel barrier, manganites, Kondo effect

Journal Title

Nano Lett

Conference Name

Journal ISSN


Volume Title


American Chemical Society (ACS)
This work was partially supported by the ERC Advanced Integrators Grant “SUPERSPIN”. B.P. was funded by the Nehru Trust for Cambridge University and St John’s College. The TEM work at Texas A&M was supported by the U.S. National Science Foundation (NSF-DMR 0846504). The authors wish to thank Prof. J. Kumar (IIT Kanpur, India) for help in improving the manuscript.