Giant tunneling magnetoresistance up to 410% at room temperature in fully epitaxial Co/MgO/Co magnetic tunnel junctions with bcc Co(001) electrodes

Journal Article · Mon Jul 24 04:00:00 EDT 2006 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.2236268· OSTI ID:20860602

Yuasa, Shinji; Fukushima, Akio; Kubota, Hitoshi; Suzuki, Yoshishige; Ando, Koji ^[1]

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1. National Institute of Advanced Industrial Science and Technology (AIST), Nanoelectronics Research Institute, Tsukuba, Ibaraki 305-8568 (Japan) and SORST, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012 (Japan)

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{sub parallel}=0 direction.

• OSTI ID: 20860602
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 4 Vol. 89; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BCC LATTICES
COBALT
CRYSTAL GROWTH
ELECTRIC POTENTIAL
ELECTRODES
FERROMAGNETIC MATERIALS
IRON
LAYERS
MAGNESIUM OXIDES
MAGNETORESISTANCE
MOLECULAR BEAM EPITAXY
SUPERCONDUCTING JUNCTIONS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
TUNNEL EFFECT