We investigated the relationship between the tunnel magnetoresistance (TMR) ratio and the electrode structure in MgO-barrier magnetic tunnel junctions (MTJs). The TMR ratio in an MTJ with Co40Fe40B20reference and free layers reached 355% at the post-deposition annealing temperature of Ta=400 °C. When Co50Fe50or Co90Fe10is used for the reference layer material, no high TMR ratio was observed. The key to have high TMR ratio is to have highly oriented (0 0 1) MgO barrier/CoFeB crystalline electrodes. The highest TMR ratio obtained so far is 450% at Ta=450 °C in a pseudo-spin-valve MTJ. © 2006 Elsevier B.V. All rights reserved.
Ikeda, S., Hayakawa, J., Lee, Y. M., Matsukura, F., & Ohno, H. (2007). Dependence of tunnel magnetoresistance on ferromagnetic electrode materials in MgO-barrier magnetic tunnel junctions. Journal of Magnetism and Magnetic Materials, 310(2 SUPPL. PART 3), 1937–1939. https://doi.org/10.1016/j.jmmm.2006.10.770