Ultrafast magneto-optics in nickel: Magnetism or optics?

被引：472

作者：

Koopmans, B ^{[1
]}

van Kampen, M ^{[1
]}

Kohlhepp, JT ^{[1
]}

de Jonge, WJM ^{[1
]}

机构：

[1] Eindhoven Univ Technol, Dept Appl Phys, COBRA Res Inst, NL-5600 MB Eindhoven, Netherlands

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 85卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.85.844

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Several magnetic and optical processes contribute to the magneto-optical response of nickel thin films after excitation by a femtosecond laser pulse. We achieved a first complete identification by explicitly measuring the time-resolved Kerr ellipticity and rotation, as well as its temperature and magnetic field dependence in epitaxially grown (111) and (001) oriented Cu/Ni/Cu wedges. The first hundreds of femtoseconds the response is dominated by state filling effects. The true demagnetization takes approximately 0.5-1 ps. At the longer (sub-ns) time scales the spins are found to precess in their anisotropy field. Simple and transparent models are introduced to substantiate our interpretation.

引用

页码：844 / 847

页数：4

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