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Magnetic tunnel junctions with MgO-EuO composite tunnel barriers

Author(s)
Miao, Guoxing; Moodera, Jagadeesh
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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.
Date issued
2012-04
URI
http://hdl.handle.net/1721.1/71710
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
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
ISSN
1098-0121
1550-235X

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