期刊
PHYSICAL REVIEW B
卷 86, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.184401
关键词
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资金
- KAKENHI from the Japanese Ministry of Education, Culture, Sports, Science and Technology [22686066, 23246006, 22360014, 22760003]
- Grants-in-Aid for Scientific Research [22686066, 22360014, 22760003, 23246006] Funding Source: KAKEN
We report enhanced tunnel magnetoresistance (TMR) ratios of 188% (308%) at room temperature and 328% (479%) at 15 K for cation-site-disordered MgAl2O4-barrier magnetic tunnel junctions (MTJs) with Fe (Fe0.5Co0.5 alloy) electrodes, which exceed the TMR ratios theoretically calculated and experimentally observed for ordered spinel barriers. The enhancement of TMR ratios is attributed to the suppression of the so-called band-folding effect in ordered spinel MTJs [Phys. Rev. B 86, 024426 (2012)]. First-principles calculations describe a dominant role of the oxygen sublattice for spin-dependent coherent tunneling, suggesting a mechanism of coherent tunneling occurring even in the disordered systems.
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