TITLE

Spin dependent tunneling spectroscopy in single crystalline bcc-Co/MgO/bcc-Co(001) junctions

AUTHOR(S)
Nishioka, Shingo; Matsumoto, Rie; Tomita, Hiroyuki; Nozaki, Takayuki; Suzuki, Yoshishige; Itoh, Hiroyoshi; Yuasa, Shinji
PUB. DATE
September 2008
SOURCE
Applied Physics Letters;9/22/2008, Vol. 93 Issue 12, p122511
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have measured the derivative conductance spectra of magnetic tunnel junctions with fully epitaxial bcc-Co electrodes and MgO barrier layers of various thicknesses. For all samples, clear peaks, caused by a minority Δ1 band in the bcc Co(001) electrodes, were observed at around 0.5 V. Below 0.7 V, the dI/dV spectra are essentially independent of the barrier layer thickness indicating the absence of scattering of any significance in the barrier layer and the validity of the coherent tunneling description in the single crystalline structure. Above 0.7 V, the spectra depend on the MgO barrier layer thickness. The contribution made to the conductivity by the intrinsic electronic structure in the MgO layer is discussed.
ACCESSION #
34647355

 

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