Intrinsic subpicosecond magnetization reversal driven by femtosecond laser pulses in GdFeCo amorphous films

被引：3
|
作者：
Li, Shufa [1 ]
Gao, Ruixin [1 ]
Cheng, Chuyuan [1 ]
Yan, Yong [1 ]
Lai, Tianshu [1 ]
机构：
[1] Sun Yat Sen Univ, Sch Phys & Engn, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Guangdong, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2013年 / 103卷 / 24期
基金：
中国国家自然科学基金;
关键词：
MAGNETOOPTIC RECORDING MATERIALS; DIRECT OVERWRITE CAPABILITY;
D O I：
10.1063/1.4846299
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Ultrafast magnetization dynamics in GdFeCo films triggered by femtosecond laser pulses with and without an external field applied is studied experimentally for different excitation fluence. It is found that subpicosecond magnetization reversal occurs simultaneously in the ultrafast dynamics of both saturation and remnant magnetization states and almost identical within 13 ps, whereas relatively slow magnetization reversal across compensation point appears only in the dynamics of saturation magnetization state. It shows the subpicosecond magnetization reversal is external field independent, and originates from intrinsic magnetic evolution in ferrimagnetic system. The intrinsic subpicosecond reversal is qualitatively explained by linear reversal. (C) 2013 AIP Publishing LLC.
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页数：5
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