Direct Observation of Magnon Excitation in a Ferromagnetic Tunnel Junction Using Inelastic-Electron-Tunneling Spectroscopy
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概要
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Inelastic-electron-tunneling spectroscopy (IETS) is applied to investigate the spin-dependent tunneling process for a Ta/Ni_<80>Fe_<20>/FeMn/Ni_<80>Fe_<20>/Al-oxide/Co/Ni_<80>Fe_<20> 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.
- 社団法人応用物理学会の論文
- 1999-10-01
著者
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遠藤 康夫
高エ研
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KUBOTA Hitoshi
Department of Applied Physics, Graduate School of Engineering, Tohoku University
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Endoh Yasuo
Physics Department Granduate School Of Science Tohoku University
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Ando Yasuo
Department Of Applied Physics Graduate School Of Engineering Tohoku University
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Endoh Yasuo
Physics Department Tohoku University
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Miyazaki Terunobu
Department Of Applied Physics Faculty Of Engineering Tohoku University
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Ando Y
Tokyo Univ. Information Sci. Chiba Jpn
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Kamijo Makoto
Department Of Applied Physics Graduate School Of Engineering Tohoku University
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MURAI Junichirou
Department of Applied Physics, Graduate School of Engineering, Tohoku University
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Murai Junichirou
Department Of Applied Physics Graduate School Of Engineering Tohoku University
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