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

被引：26

作者：

Murai, J ^{[1
]}

Ando, Y ^{[1
]}

Kamijo, M ^{[1
]}

Kubota, H ^{[1
]}

Miyazaki, T ^{[1
]}

机构：

[1] Tohoku Univ, Grad Sch Engn, Dept Appl Phys, Aoba Ku, Sendai, Miyagi 9808579, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS | 1999年 / 38卷 / 10A期

关键词：

IETS; ferromagnetic tunnel junction; tunnel magnetoresistive effect; magnon; magnetization configuration;

D O I：

10.1143/JJAP.38.L1106

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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 spec tra for ba th 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.

引用

页码：L1106 / L1108

页数：3

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