Magnetic tunnel junctions with metastable bcc Co3Mn electrodes

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

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


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
JournalApplied Physics Express
Issue number8
Publication statusPublished - 2020 Aug 1


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