Magnon excitation of CoFe/Al-oxide/CoFe ferromagnetic tunnel junctions

Inelastic-electron-tunneling (IET) spectroscopy has been applied to investigate the magnon-induced inelastic tunneling process for Ta/Ni 80Fe 20/Cu/Ni 80Fe 20/IrMn/Co 75Fe 25/Al-oxide/Co 75Fe 25/Ni 80Fe 20/Ta ferromagnetic tunnel junctions. For the junction with the oxidation time, t ox =40 s , whic...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2001-05, Vol.226, p.922-923
Main Authors: Murai, J, Ando, Y, Daibou, T, Yaoita, K, Han, H.F, Miyazaki, T
Format: Article
Language:English
Subjects:
Interface structure
Magnons
Transport properties
Tunneling
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Summary:Inelastic-electron-tunneling (IET) spectroscopy has been applied to investigate the magnon-induced inelastic tunneling process for Ta/Ni 80Fe 20/Cu/Ni 80Fe 20/IrMn/Co 75Fe 25/Al-oxide/Co 75Fe 25/Ni 80Fe 20/Ta ferromagnetic tunnel junctions. For the junction with the oxidation time, t ox =40 s , which is the exact time to oxidize the 8 Å Al, the subtraction spectrum of the IET spectra between the parallel and anti-parallel magnetization configurations clearly showed two peaks at ±3 and ±16 mV showed. On the other hand, the spectrum for the junction with t ox =120 s showed a broad peak at around 18 mV and a plateau at zero-bias. This was caused by the change of the correlation length of magnon inelastic excitation due to the over oxidation of the bottom electrode.
ISSN:0304-8853
DOI:10.1016/S0304-8853(00)01105-7