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Tunneling spectra of sputter-deposited CoFeB/MgO/CoFeB magnetic tunnel junctions showing giant tunneling magnetoresistance effect by Rie Matsumoto; Yusuke Hamada; Masaki Mizuguchi; Masashi Shiraishi; Hiroki Maehara; Koji Tsunekawa; David D. Djayaprawira; Naoki Watanabe; Yoshinari Kurosaki; Taro Nagahama; Akio Fukushima; Hitoshi Kubota; Shinji Yuasa; Yoshishige Suzuki is a Physics and Astronomy article available to read on EtoBox.

What is Tunneling spectra of sputter-deposited CoFeB/MgO/CoFeB magnetic tunnel junctions showing giant tunneling magnetoresistance effect about?

We measured differential tunneling conductance (dI/dV, d 2 I/dV 2 ) spectra of spin-valve-type magnetic tunnel junctions (MTJs) with a MgO(001) tunnel barrier layer and amorphous CoFeB ferromagnetic electrodes that show 315% magnetoresistance (MR) ratio at 4.3 K. The dI/dV spectra showed clear reduction in the conductance at around G400 mV for a parallel magnetic configuration. Such anomalous spectra have never been observed for MTJs with an amorphous Al-O barrier. The d 2 I/dV 2 spectra showed several distinct peaks between 5 and 100 mV. Magnon excitations are assigned to an origin of those peaks and thought to be a dominant process to reduce MR at finite bias voltage.

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Author

Rie Matsumoto; Yusuke Hamada; Masaki Mizuguchi; Masashi Shiraishi; Hiroki Maehara; Koji Tsunekawa; David D. Djayaprawira; Naoki Watanabe; Yoshinari Kurosaki; Taro Nagahama; Akio Fukushima; Hitoshi Kubota; Shinji Yuasa; Yoshishige Suzuki

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0038-1098)

Published

2005

Language

EN

Field

Physics and Astronomy (Physical Sciences)