Abstract
Fully epitaxial Co(001)∕MgO(001)∕Co(001) magnetic tunnel junctions (MTJs) with metastable bcc Co(001) electrodes were fabricated with molecular beam epitaxy. The MTJs exhibited giant magnetoresistance (MR) ratios up to 410% at room temperature, the highest value reported to date. Temperature dependence of the MR ratio was observed to be very small compared with fully epitaxial Fe∕MgO∕Fe and textured CoFeB∕MgO∕CoFeB MTJs. The MR ratio of the Co∕MgO∕Co MTJ showed larger bias voltage dependence than that of the epitaxial Fe∕MgO∕Fe MTJs, which probably reflects the band structures of bcc Co and Fe for the k‖=0 direction.
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