Direct evidence of spin filtering across MnFe[subscript 2]O[subscript 4] tunnel barrier by Meservey-Tedrow experiment
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Matzen-2013-Direct evidence of spin filtering.pdf
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Author(s)
Matzen, S.
Moussy, J.-B.
Miao, Guoxing
Moodera, Jagadeesh
Date Issued
May 2013
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
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology)
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.87.184422
