Controllable Magnetization Precession Dynamics and Damping Anisotropy in Co2FeAl Heusler-Alloy Films

2021 ◽  
Author(s):  
Yu Zhang ◽  
Guanjie Wu ◽  
Weihua Zhu ◽  
Zhihao Ji ◽  
Qingyuan Jin ◽  
...  
Keyword(s):  
Thin Films ◽  
Heusler Alloy ◽  
Kerr Effect ◽  
Precession Frequency ◽  
Optical Kerr Effect ◽  
Magnetization Dynamics ◽  
Time Resolved ◽  
Alloy Films ◽  
Magnetization Precession ◽  
Magneto Optical Kerr Effect

Magnetization dynamics of the epitaxially-grown Co2FeAl (CFA) thin films have been systematically investigated by the time-resolved magneto-optical Kerr effect (TR-MOKE). The dependences of precession frequency f, relaxion time τ and...

Laser-Induced Magnetization Dynamics of GdFeCo Film Probing by Time Resolved Magneto-Optic Kerr Effect

SPIN ◽  
2015 ◽  
Vol 05 (04) ◽  
pp. 1540014 ◽  
Author(s):  
Wei He ◽  
Hong-Ye Wu ◽  
Jian-Wang Cai ◽  
Yao-Wen Liu ◽  
Zhao-Hua Cheng
Keyword(s):  
Diffusion Coefficient ◽  
Kerr Effect ◽  
Recovery Process ◽  
Optical Effect ◽  
Magnetization Dynamics ◽  
Time Resolved ◽  
Thermal Diffusion Coefficient ◽  
Magneto Optical Effect ◽  
Magnetization Orientation ◽  
Magnetization Precession

Laser-induced magnetization dynamics in Gd[Formula: see text]Fe[Formula: see text]Co[Formula: see text] (GdFeCo) film was investigated by time-resolved magneto-optical effect. After an ultrafast demagnetization and a magnetization recovery process, a second slower drop from several picoseconds (ps) to 200[Formula: see text]ps was observed. Previous report explained it as the demagnetization of Gd sublattice. However, when timescale extended up to 5 nanosecond (ns), we identified it as the part of an oscillated magnetization precession. It presents the change of magnetization orientation rather than the change of magnetization amplitude. Our results reveal that the low thermal diffusion coefficient of GdFeCo film plays an important role in the laser-induced magnetization dynamics of GdFeCo film.

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