Spin-polarized tunneling spectroscopy of Co(0001) surface states

被引：44

作者：

Okuno, SN ^{[1
]}

Kishi, T ^{[1
]}

Tanaka, K ^{[1
]}

机构：

[1] Toshiba Co Ltd, Ctr Corp Res & Dev, Kawasaki, Kanagawa 2128582, Japan

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 88卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.88.066803

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Spin-polarized tunneling was studied on Co surfaces of exchange coupled Co/Cu/Co samples, using an Fe tip. A spin-polarized surface state of Co(0001) was found to exist at -0.43 eV relative to E-F, with FWHM of 0.23 eV in the spectra. The state exhibits negative magnetoresistance with an effective spin polarization of less than -23%, suggesting negatively high spin polarization of the surface state. Our first-principles calculations have supported the existence of the surface state. From the calculation, the state is identified as a minority spin (Γ) over bar -centered d(z)(2)-like surface state.

引用

页数：4

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