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Nanopillar spin filter tunnel junctions with manganite barriers
Bhagwati Prasad1, Mehmet Egilmez, Frank Schoofs
1Department of Materials Science and Metallurgy, University of Cambridge , 27 Charles Babbage Road, Cambridge, CB3 0FS, U.K.
Nano Letters
|April 19, 2014
Summary
This study demonstrates manganite ferromagnetic insulators for spin-filtering, achieving 75% spin polarization in an oxide nanopillar tunnel junction. Further research into manganites could enable room-temperature spin-filter applications.
Area of Science:
- Spintronics
- Condensed Matter Physics
- Materials Science
Background:
- Manganite ferromagnetic insulators show promise for spin-filtering applications.
- Oxide nanopillar tunnel junctions are key structures for spintronic devices.
Purpose of the Study:
- To demonstrate the spin-filtering potential of a specific manganite ferromagnetic insulator.
- To investigate the spin polarization and transport properties of an ultrathin Sm0.75Sr0.25MnO3 film in a tunnel junction.
Main Methods:
- Integration of an ultrathin Sm0.75Sr0.25MnO3 film as a barrier in an epitaxial oxide nanopillar tunnel junction.
- Measurement of spin polarization and dynamic conductance at low temperatures (5 K).
- Analysis of transport phenomena using the Kondo scattering model.
Main Results:
- Achieved a high spin polarization of up to 75% at 5 K.
- Observed a large zero-bias anomaly in dynamic conductance, explained by Kondo scattering.
- Reported decreased spin polarization at low bias and hysteretic magnetoresistance at low temperatures.
Conclusions:
- The study validates the use of manganite ferromagnetic insulators for spin-filtering.
- Results suggest potential for room-temperature spin-filter applications using other manganite-based materials.
- Further exploration of manganites is recommended for advancing spin-electronics.
