Observation of tunnel magnetoresistance in a superconducting junction with Zeeman-split energy bands

Author(s)
Li, Bin; Miao, Guoxing; Moodera, Jagadeesh
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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.
Date issued
2013-10
URI
http://hdl.handle.net/1721.1/88763
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)
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
ISSN
1098-0121
1550-235X
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