Nanopillar Spin Filter Tunnel Junctions with Manganite Barriers
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Prasad, B., Egilmez, M., Schoofs, F., Fix, T., Vickers, M., Zhang, W., Jian, J., et al. (2014). Nanopillar Spin Filter Tunnel Junctions with Manganite Barriers. Nano Letters https://doi.org/10.1021/nl500798b
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
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.
External DOI: https://doi.org/10.1021/nl500798b
This record's URL: https://www.repository.cam.ac.uk/handle/1810/245250