Tunneling spectroscopy in CoFeBMgOCoFeB magnetic tunnel junctions

Kazunaga Ono, Tadaomi Daibou, Sung Jin Ahn, Yuya Sakuraba, Takefumi Miyakoshi, Tadashi Morita, Yukio Kikuchi, Mikihiko Oogane, Yasuo Ando, Terunobu Miyazaki

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

The d2 Vd I2 -V measurements were used to investigate the tunneling mechanism in CoFeBMgOCoFeB magnetic tunnel junctions (MTJs), which showed a giant tunnel magnetoresistance ratio up to 200% at room temperature. The d2 Vd I2 -V spectra of CoFeBMgOCoFeB 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 CoFeBMgOCoFeB junctions originates in coherent tunneling between the Δ1 bands of crystallized CoFeB electrodes.

Original languageEnglish
Article number08A905
JournalJournal of Applied Physics
Volume99
Issue number8
DOIs
Publication statusPublished - 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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