Magnetic tunnel junctions with metastable bcc Co3Mn electrodes

Kazuma Kunimatsu, Tomoki Tsuchiya, Tufan Roy, Kelvin Elphick, Masahito Tsujikawa, Atsufumi Hirohata, Masafumi Shirai, Shigemi Mizukami

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We studied magnetic tunnel junctions (MTJs) with a MgO(001) barrier and metastable bcc Co3Mn(001) disordered alloy electrodes. A tunnel magnetoresistance (TMR) ratio was approximately 200{250% observed at room temperature.We successfully observed the TMR ratio greater than 600% at 10 K which was higher than the past reported value of MgO-based MTJs with ultrathin bcc Co(001) electrodes. However our experimental value was still much lower than the past theoretical prediction in bcc Co/MgO/Co(001) MTJs. We discuss some differences in the bulk band structure affecting the TMR effect for bcc Co and bcc Co3Mn.
Original languageEnglish
Article number083007
Number of pages6
JournalApplied Physics Express
Issue number8
Publication statusPublished - 4 Aug 2020

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