Shinya Ota, Masaki Ono, Hiroki Matsumoto, Akira Ando, Tsuyoshi Sekitani, Ryuhei Kohno, Shogo Iguchi, Tomohiro Koyama and Daichi Chiba
We succeeded in fabricating a CoFeB/MgO-based magnetic tunnel junction (MTJ) directly on an organic flexible substrate. The MTJ shows good strain endurance while keeping the tunnel magnetoresistance (TMR) ratio of ~100% under various strained conditions; the TMR ratio is almost unchanged up to a tensile strain of 1.2%. Because of the magnetoelastic effect, the magnetic anisotropy fields for the top and bottom CoFeB layers are linearly proportional to strain with almost the same rate as that in a single CoFeB film, suggesting that the expected strain is added on both CoFeB layers in the MTJ pillar from the stretched flexible substrate.
Applied Physics Express：https://iopscience.iop.org/article/10.7567/1882-0786/ab0dca
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