Observation of tunnel magnetoresistance in a superconducting junction with Zeeman-split energy bands
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Li-2013-Observation of tunnel magnetoresistance.pdf
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Author(s)
Li, Bin
Miao, Guoxing
Moodera, Jagadeesh
Date Issued
October 2013
Journal
Physical Review B
Publisher
American Physical Society
Citation
Li, Bin, Guo-Xing Miao, and Jagadeesh S. Moodera. “Observation of Tunnel Magnetoresistance in a Superconducting Junction with Zeeman-Split Energy Bands.” Phys. Rev. B 88, no. 16 (October 2013). © 2013 American Physical Society
Version
Final published version
Abstract
The change of the quasiparticle density of states in a superconductor due to the Zeeman splitting can lead to highly responsive spintronic devices. This is demonstrated here in the magnetotunneling studies of a supercondcutor/insulator/ferromagnet tunnel junction. A tunnel magnetoresistance (TMR) as large as 36% is obtained, resulting from the conductance variation due to spin-split quasiparticle tunneling, and only occurs in the superconducting state. Our results show that in addition to the naturally existent spin imbalance in ferromagnets (upon which conventional TMR is obtained), we can manipulate tunnel conductance by tailoring spin dependent density of states with interfacial exchange fields, and even with a tunnel junction with both superconducting electrodes.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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.88.161105
