Ultrafast Transport of Laser-Excited Spin-Polarized Carriers in Au/Fe/MgO(001)

被引：225

作者：

Melnikov, Alexey ^{[1
,2
]}

Razdolski, Ilya ^{[3
]}

Wehling, Tim O. ^{[4
]}

Papaioannou, Evangelos Th ^{[2
]}

Roddatis, Vladimir ^{[5
]}

Fumagalli, Paul ^{[2
]}

Aktsipetrov, Oleg ^{[3
]}

Lichtenstein, Alexander I. ^{[4
]}

Bovensiepen, Uwe ^{[2
,6
]}

机构：

[1] Max Planck Gesell, Dept Phys Chem, Fritz Haber Inst, D-14195 Berlin, Germany

[2] Free Univ Berlin, Dept Phys, D-14195 Berlin, Germany

[3] Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119991, Russia

[4] Univ Hamburg, Inst Theoret Phys, D-20355 Hamburg, Germany

[5] NRC Kurchatov Inst, Moscow 123182, Russia

[6] Univ Duisburg Essen, Fac Phys, D-47048 Duisburg, Germany

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 07期

基金：

俄罗斯基础研究基金会;

关键词：

THIN GOLD-FILMS; ULTRASOFT PSEUDOPOTENTIALS; 2ND-HARMONIC GENERATION; DYNAMICS; DEMAGNETIZATION; MAGNETISM;

D O I：

10.1103/PhysRevLett.107.076601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Hot carrier-induced spin dynamics is analyzed in epitaxial Au/Fe/MgO(001) by a time domain approach. We excite a spin current pulse in Fe by 35 fs laser pulses. The transient spin polarization, which is probed at the Au surface by optical second harmonic generation, changes its sign after a few hundred femtoseconds. This is explained by a competition of ballistic and diffusive propagation considering energy-dependent hot carrier relaxation rates. In addition, we observe the decay of the spin polarization within 1 ps, which is associated with the hot carrier spin relaxation time in Au.

引用

页数：5

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