Tunneling spectroscopy in CoFeB ∕ MgO ∕ CoFeB magnetic tunnel junctions

The d 2 V ∕ d I 2 - V measurements were used to investigate the tunneling mechanism in CoFeB ∕ MgO ∕ CoFeB magnetic tunnel junctions (MTJs), which showed a giant tunnel magnetoresistance ratio up to 200% at room temperature. The d 2 V ∕ d I 2 - V spectra of CoFeB ∕ MgO ∕ CoFeB junctions resemble tho...

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Bibliographic Details
Published in:Journal of applied physics 2006-04, Vol.99 (8), p.08A905-08A905-3
Main Authors: Ono, Kazunaga, Daibou, Tadaomi, Ahn, Sung-Jin, Sakuraba, Yuya, Miyakoshi, Takefumi, Morita, Tadashi, Kikuchi, Yukio, Oogane, Mikihiko, Ando, Yasuo, Miyazaki, Terunobu
Format: Article
Language:English
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Summary:The d 2 V ∕ d I 2 - V measurements were used to investigate the tunneling mechanism in CoFeB ∕ MgO ∕ CoFeB magnetic tunnel junctions (MTJs), which showed a giant tunnel magnetoresistance ratio up to 200% at room temperature. The d 2 V ∕ d I 2 - V spectra of CoFeB ∕ MgO ∕ CoFeB junctions resemble those of single-crystal Fe ( 001 ) ∕ MgO ( 001 ) ∕ Fe ( 001 ) MTJs. Broad peaks appeared around ± 600 mV in spectra for antiparallel magnetic configurations. A complex structure was apparent in the spectra for parallel configurations. We inferred that giant tunnel magnetoresistance observed in CoFeB ∕ MgO ∕ CoFeB junctions originates in coherent tunneling between the Δ 1 bands of crystallized CoFeB electrodes.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.2173628