The influence of the excitation pulse length on ultrafast magnetization dynamics in nickel

被引：11
|
作者：
Fognini, A. [1 ]
Salvatella, G. [1 ]
Gort, R. [1 ]
Michlmayr, T. [1 ]
Vaterlaus, A. [1 ]
Acremann, Y. [1 ]
机构：
[1] ETH, Solid State Phys Lab, CH-8093 Zurich, Switzerland
来源：
STRUCTURAL DYNAMICS-US | 2015年 / 2卷 / 02期
基金：
瑞士国家科学基金会;
关键词：
SPIN; DRIVEN; MAGNETOOPTICS;
D O I：
10.1063/1.4914891
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The laser-induced demagnetization of a ferromagnet is caused by the temperature of the electron gas as well as the lattice temperature. For long excitation pulses, the two reservoirs are in thermal equilibrium. In contrast to a picosecond laser pulse, a femtosecond pulse causes a non-equilibrium between the electron gas and the lattice. By pump pulse length dependent optical measurements, we find that the magnetodynamics in Ni caused by a picosecond laser pulse can be reconstructed from the response to a femtosecond pulse. The mechanism responsible for demagnetization on the picosecond time scale is therefore contained in the femtosecond demagnetization experiment. (C) 2015 Author(s).
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页数：6
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