Magnetic tunnel junctions with MgO-EuO composite tunnel barriers
Name
Miao-2012-Magnetic tunnel junctions with.pdf
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434.07 KB
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Author(s)
Miao, Guoxing
Moodera, Jagadeesh
Date Issued
April 2012
Journal
Physical Review B
Publisher
American Physical Society
Citation
Miao, Guo-Xing, and Jagadeesh S. Moodera. “Magnetic Tunnel Junctions with MgO-EuO Composite Tunnel Barriers.” Physical Review B 85.14 (2012). ©2012 American Physical Society
Version
Final published version
Abstract
The chalcogenide compound EuO is best known as a highly efficient spin-filter tunnel barrier material. Using the molecular beam epitaxy method, we combine polycrystalline EuO with epitaxial MgO and construct magnetic tunnel junctions with such hybrid tunnel barriers. Tunnel magnetoresistance of over 40% was achieved in junctions with oxygen-rich EuO. For lower oxygen concentration, magnetoresistance decreases dramatically and eventually vanishes, indicating that spin filtering is weakened when the transport is mainly mediated by excess conduction channels through defect sites.
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.85.144424
