Femtosecond electron and spin dynamics in Gd(0001) studied by time-resolved photoemission and magneto-optics

被引：84

作者：

Lisowski, M ^{[1
]}

Loukakos, PA ^{[1
]}

Melnikov, A ^{[1
]}

Radu, I ^{[1
]}

Ungureanu, L ^{[1
]}

Wolf, M ^{[1
]}

Bovensiepen, U ^{[1
]}

机构：

[1] Free Univ Berlin, Fachbereich Phys, D-14195 Berlin, Germany

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 13期

关键词：

D O I：

10.1103/PhysRevLett.95.137402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Femtosecond electron and spin dynamics of the Gd(0001) surface are investigated by time-resolved photoemission and second harmonic generation. Upon optical excitation the spin polarization of the surface state is reduced by half while its exchange splitting remains nearly unchanged. Electron-magnon interaction is proposed to facilitate electron-spin-flip scattering among spin-mixed surface and bulk states, which provides a mechanism for ultrafast demagnetization.

引用

页数：4

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