[18a-P03-1~16] 10 Spintronics and Magnetics(Poster)

[18a-P03-9] Large Inverse TMR in Fe₃O₄(001)/MgO(001)/Fe(001) magnetic tunnel junctions

Shoma Yasui¹, Shuta Honda², Jun Okabayashi³, Takashi Yanase⁴, Toshihiro Shimada⁴, 〇Taro Nagahama⁴ (1.Hokkaido Univ., 2.Knasai Univ., 3.Univ. of Tokyo, 4.Hokaido Univ.)

Keywords:Magnetite, Tunnel magnetoresistance

Fe3O4 has been expected to be high-performance spintronic material due to high spin polarization. However, the Fe3O4-MTJ exhibited a small TMR ratio of 30%. In this study, we fabricated fully epitaxial Fe3O4(001)/MgO(001)/Fe(001) MTJs, and observed large TMR of -55.6% corresponding to 126% in the optimistic definition. The TMR ratio showed characteristic temperature dependence because of Verwey transition of Fe3O4 electrodes.