Abstract
The d2V∕dI2-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 d2V∕dI2-V spectra of CoFeB∕MgO∕CoFeB junctions resemble those of single-crystal Fe(001)∕MgO(001)∕Fe(001) MTJs. Broad peaks appeared around ±600mV 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 Δ1 bands of crystallized CoFeB electrodes.
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