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.
No takes yet. Share an insight, caveat, or question.
Sukegawa et al. (2012) studied this question.
Synapse has enriched one closely related paper. Consider it for comparative context: