Direct observation of magnon excitation in a ferromagnetic tunnel junction using inelastic-electron-tunneling spectroscopy

Junichirou Murai, Yasuo Ando, Makoto Kamijo, Hitoshi Kubota, Terunobu Miyazaki

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23 Citations (Scopus)

Abstract

Inelastic-electron-tunneling spectroscopy (IETS) is applied to investigate the spin-dependent tunneling process for a Ta/Ni80Fe20/FeMn/Ni80Fe20/Al-oxide/Co/Ni80Fe20 ferromagnetic tunnel junction. IET spectra for both parallel and antiparallel magnetization configurations of ferromagnetic electrodes exhibit a strong peak at 20 mV. Using the subtraction between these spectra, we obtain the inelastic excitation spectrum induced only by the magnetic origin. This spectrum exhibits a strong peak at 18 mV and decreases monotonically with increasing bias voltage. The bias-voltage dependence of tunnel magnetoresistance (TMR) is the same. These results are discussed by considering the distribution of the surface magnon excitation energy.

Original languageEnglish
Pages (from-to)L1106-L1108
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume38
Issue number10 A
Publication statusPublished - 1999 Dec 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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