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

doi:10.1063/1.2173628

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

ENG - Applied Physics

Research output: Contribution to journal › Article › peer-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 language	English
Article number	08A905
Journal	Journal of Applied Physics
Volume	99
Issue number	8
DOIs	https://doi.org/10.1063/1.2173628
Publication status	Published - 2006 May 25

ASJC Scopus subject areas

Physics and Astronomy(all)

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Tunneling spectroscopy in CoFeBMgOCoFeB magnetic tunnel junctions. / Ono, Kazunaga; Daibou, Tadaomi; Ahn, Sung Jin; Sakuraba, Yuya; Miyakoshi, Takefumi; Morita, Tadashi; Kikuchi, Yukio; Oogane, Mikihiko ; Ando, Yasuo; Miyazaki, Terunobu.

In: Journal of Applied Physics, Vol. 99, No. 8, 08A905, 25.05.2006.

Research output: Contribution to journal › Article › peer-review

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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.",

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AU - Ono, Kazunaga

AU - Daibou, Tadaomi

AU - Ahn, Sung Jin

AU - Sakuraba, Yuya

AU - Miyakoshi, Takefumi

AU - Morita, Tadashi

AU - Kikuchi, Yukio

AU - Oogane, Mikihiko

AU - Ando, Yasuo

AU - Miyazaki, Terunobu

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AB - 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.

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