Direct evidence of spin filtering across MnFe[subscript 2]O[subscript 4] tunnel barrier by Meservey-Tedrow experiment

Author(s)
Matzen, S.; Moussy, J.-B.; Miao, Guoxing; Moodera, Jagadeesh
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Abstract
A spin filtering effect has been evidenced in epitaxial MnFe[subscript 2]O[subscript 4] tunnel barriers directly by Meservey-Tedrow experiments. The asymmetry of the Zeeman-split tunneling conductance curves of the superconducting Al spin analyzer in Pt(111)/MnFe[subscript 2]O[subscript 4](111)/γ-Al[subscript 2]O[subscript 3](111)/Al tunnel junctions revealed a positive spin-polarization (up to +9%), proving the potential of manganese ferrite for generation of a spin-polarized current. A negatively polarized spin filtering being expected theoretically, different mechanisms are discussed to explain both sign and amplitude of the measured spin-polarization.
Date issued
2013-05
URI
http://hdl.handle.net/1721.1/88766
Department
Massachusetts Institute of Technology. Department of Physics; Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology)
Journal
Physical Review B
Publisher
American Physical Society
Citation
Matzen, S., J.-B. Moussy, G. X. Miao, and J. S. Moodera. “Direct Evidence of Spin Filtering Across MnFe[subscript 2]O[subscript 4] Tunnel Barrier by Meservey-Tedrow Experiment.” Phys. Rev. B 87, no. 18 (May 2013). © 2013 American Physical Society
Version: Final published version
ISSN
1098-0121
1550-235X
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