Journal
PHYSICAL REVIEW B
Volume 81, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.140402
Keywords
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Funding
- NEDO
- CREST
- JST-DFG
- Ministry of Sciences and Higher Education [4531/B/T02/2010/38]
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Spin-dependent coherent tunneling has been experimentally observed in high-quality sputtered-deposited Co2FeAl/MgO/CoFe epitaxial magnetic tunneling junctions (MTJs). Consequently, the microfabricated MTJs manifest a very large tunnel magnetoresistance (TMR) at room temperature and an unexpectedly TMR oscillation as a function of MgO barrier thickness. First-principles electronic band calculations confirm the pronounced coherent tunneling effect and are in good agreement with the experimental data. The present work demonstrates the importance of coherent tunneling for large TMR with Heusler alloys
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